Articles | Volume 18, issue 2
https://doi.org/10.5194/cp-18-313-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-18-313-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
17 Feb 2022
Research article |
| 17 Feb 2022
| 17 Feb 2022
Effect of nitrogen limitation and soil biophysics on Holocene greening of the Sahara
Jooyeop Lee
Ecosystem–Atmosphere Process Laboratory, Department of Atmospheric
Sciences, Yonsei University, Seoul, Korea (Republic of)
Martin Claussen
Max-Planck-Institut für Meteorologie, Hamburg, Germany
Center for Earth System Research and Sustainability (CEN),
Universität Hamburg, Hamburg, Germany
Jeongwon Kim
Ecosystem–Atmosphere Process Laboratory, Department of Atmospheric
Sciences, Yonsei University, Seoul, Korea (Republic of)
Je-Woo Hong
Korea Adaptation Center for Climate Change, Korea Environment
Institute, Sejong, Korea (Republic of)
In-Sun Song
Mathematical Atmospheric Physics Lab, Department of Atmospheric
Sciences, Yonsei University, Seoul, Korea (Republic of)
Ecosystem–Atmosphere Process Laboratory, Department of Atmospheric
Sciences, Yonsei University, Seoul, Korea (Republic of)
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Wonseok Lee, In-Sun Song, Byeong-Gwon Song, and Yong Ha Kim
Atmos. Chem. Phys., 24, 3559–3575, https://doi.org/10.5194/acp-24-3559-2024, https://doi.org/10.5194/acp-24-3559-2024, 2024
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We investigate the seasonal variation of westward-propagating quasi-10 d wave (Q10DW) activity in the southern high-latitude mesosphere. The observed Q10DW is amplified around equinoxes. The model experiments indicate that the Q10DW can be enhanced in the high-latitude mesosphere due to large-scale instability. However, an excessively strong instability in the summer mesosphere spuriously generates the Q10DW in the model, potentially leading to inaccurate model dynamics.
Kyoung-Min Kim, Si-Wan Kim, Seunghwan Seo, Donald R. Blake, Seogju Cho, James H. Crawford, Louisa K. Emmons, Alan Fried, Jay R. Herman, Jinkyu Hong, Jinsang Jung, Gabriele G. Pfister, Andrew J. Weinheimer, Jung-Hun Woo, and Qiang Zhang
Geosci. Model Dev., 17, 1931–1955, https://doi.org/10.5194/gmd-17-1931-2024, https://doi.org/10.5194/gmd-17-1931-2024, 2024
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Three emission inventories were evaluated for East Asia using data acquired during a field campaign in 2016. The inventories successfully reproduced the daily variations of ozone and nitrogen dioxide. However, the spatial distributions of model ozone did not fully agree with the observations. Additionally, all simulations underestimated carbon monoxide and volatile organic compound (VOC) levels. Increasing VOC emissions over South Korea resulted in improved ozone simulations.
Nora Farina Specht, Martin Claussen, and Thomas Kleinen
EGUsphere, https://doi.org/10.5194/egusphere-2023-3081, https://doi.org/10.5194/egusphere-2023-3081, 2024
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The terrestrial water cycle over the Sahara/Sahel is closed by implementing a new model of endorheic lakes into a climate model. A factor analysis of mid-Holocene simulations shows that dynamic lakes and dynamic vegetation individually cause a precipitation increase over northern Africa that is, in the sum, larger than the precipitation increase caused by interacting lakes and vegetation dynamics. Thus, the lake-vegetation interaction causes a relative drying response over the entire Sahel.
Leonore Jungandreas, Cathy Hohenegger, and Martin Claussen
Clim. Past, 19, 637–664, https://doi.org/10.5194/cp-19-637-2023, https://doi.org/10.5194/cp-19-637-2023, 2023
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Increasing the vegetation cover over mid-Holcocene North Africa expands the West African monsoon ∼ 4–5° further north. This northward shift of monsoonal precipitation is caused by interactions of the land surface with large-scale monsoon circulation and the coupling of soil moisture to precipitation. We highlight the importance of considering not only how soil moisture influences precipitation but also how different precipitation characteristics alter the soil hydrology via runoff generation.
Mathew Lipson, Sue Grimmond, Martin Best, Winston T. L. Chow, Andreas Christen, Nektarios Chrysoulakis, Andrew Coutts, Ben Crawford, Stevan Earl, Jonathan Evans, Krzysztof Fortuniak, Bert G. Heusinkveld, Je-Woo Hong, Jinkyu Hong, Leena Järvi, Sungsoo Jo, Yeon-Hee Kim, Simone Kotthaus, Keunmin Lee, Valéry Masson, Joseph P. McFadden, Oliver Michels, Wlodzimierz Pawlak, Matthias Roth, Hirofumi Sugawara, Nigel Tapper, Erik Velasco, and Helen Claire Ward
Earth Syst. Sci. Data, 14, 5157–5178, https://doi.org/10.5194/essd-14-5157-2022, https://doi.org/10.5194/essd-14-5157-2022, 2022
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We describe a new openly accessible collection of atmospheric observations from 20 cities around the world, capturing 50 site years. The observations capture local meteorology (temperature, humidity, wind, etc.) and the energy fluxes between the land and atmosphere (e.g. radiation and sensible and latent heat fluxes). These observations can be used to improve our understanding of urban climate processes and to test the accuracy of urban climate models.
Lim-Seok Chang, Donghee Kim, Hyunkee Hong, Deok-Rae Kim, Jeong-Ah Yu, Kwangyul Lee, Hanlim Lee, Daewon Kim, Jinkyu Hong, Hyun-Young Jo, and Cheol-Hee Kim
Atmos. Chem. Phys., 22, 10703–10720, https://doi.org/10.5194/acp-22-10703-2022, https://doi.org/10.5194/acp-22-10703-2022, 2022
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Our study explored the synergy of combined column and surface measurements during GMAP (GEMS Map of Air Pollution) campaign. It has several points to note for vertical distribution analysis. Particularly under prevailing local wind meteorological conditions, Pandora-based vertical structures sometimes showed negative correlations between column and surface measurements. Vertical analysis should be done carefully in some local meteorological conditions when employing either surface or columns.
Mateo Duque-Villegas, Martin Claussen, Victor Brovkin, and Thomas Kleinen
Clim. Past, 18, 1897–1914, https://doi.org/10.5194/cp-18-1897-2022, https://doi.org/10.5194/cp-18-1897-2022, 2022
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Using an Earth system model of intermediate complexity, we quantify contributions of the Earth's orbit, greenhouse gases (GHGs) and ice sheets to the strength of Saharan greening during late Quaternary African humid periods (AHPs). Orbital forcing is found as the dominant factor, having a critical threshold and accounting for most of the changes in the vegetation response. However, results suggest that GHGs may influence the orbital threshold and thus may play a pivotal role for future AHPs.
Nora Farina Specht, Martin Claussen, and Thomas Kleinen
Clim. Past, 18, 1035–1046, https://doi.org/10.5194/cp-18-1035-2022, https://doi.org/10.5194/cp-18-1035-2022, 2022
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Palaeoenvironmental records only provide a fragmentary picture of the lake and wetland extent in North Africa during the mid-Holocene. Therefore, we investigate the possible range of mid-Holocene precipitation changes caused by an estimated small and maximum lake extent and a maximum wetland extent. Results show a particularly strong monsoon precipitation response to lakes and wetlands over the Western Sahara and an increased monsoon precipitation when replacing lakes with vegetated wetlands.
Chang-Hwan Park, Aaron Berg, Michael H. Cosh, Andreas Colliander, Andreas Behrendt, Hida Manns, Jinkyu Hong, Johan Lee, Runze Zhang, and Volker Wulfmeyer
Hydrol. Earth Syst. Sci., 25, 6407–6420, https://doi.org/10.5194/hess-25-6407-2021, https://doi.org/10.5194/hess-25-6407-2021, 2021
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In this study, we proposed an inversion of the dielectric mixing model for a 50 Hz soil sensor for agricultural organic soil. This model can reflect the variability of soil organic matter (SOM) in wilting point and porosity, which play a critical role in improving the accuracy of SM estimation, using a dielectric-based soil sensor. The results of statistical analyses demonstrated a higher performance of the new model than the factory setting probe algorithm.
Keunmin Lee, Je-Woo Hong, Jeongwon Kim, Sungsoo Jo, and Jinkyu Hong
Atmos. Chem. Phys., 21, 17833–17853, https://doi.org/10.5194/acp-21-17833-2021, https://doi.org/10.5194/acp-21-17833-2021, 2021
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This study examine two benefits of urban forest, thermal mitigation and carbon uptake. Our analysis indicates that the urban forest reduces both the warming trend and urban heat island intensity. Urban forest is a net CO2 source despite larger photosynthetic carbon uptake because of strong contribution of ecosystem respiration, which can be attributed to the substantial amount of soil organic carbon by intensive historical soil use and warm temperature in a city.
Anne Dallmeyer, Martin Claussen, Stephan J. Lorenz, Michael Sigl, Matthew Toohey, and Ulrike Herzschuh
Clim. Past, 17, 2481–2513, https://doi.org/10.5194/cp-17-2481-2021, https://doi.org/10.5194/cp-17-2481-2021, 2021
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Using the comprehensive Earth system model, MPI-ESM1.2, we explore the global Holocene vegetation changes and interpret them in terms of the Holocene climate change. The model results reveal that most of the Holocene vegetation transitions seen outside the high northern latitudes can be attributed to modifications in the intensity of the global summer monsoons.
Leonore Jungandreas, Cathy Hohenegger, and Martin Claussen
Clim. Past, 17, 1665–1684, https://doi.org/10.5194/cp-17-1665-2021, https://doi.org/10.5194/cp-17-1665-2021, 2021
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We investigate the impact of explicitly resolving convection on the mid-Holocene West African Monsoon rain belt by employing the ICON climate model in high resolution. While the spatial distribution and intensity of the precipitation are improved by this technique, the monsoon extents further north and the mean summer rainfall is higher in the simulation with parameterized convection.
Yongkang Xue, Tandong Yao, Aaron A. Boone, Ismaila Diallo, Ye Liu, Xubin Zeng, William K. M. Lau, Shiori Sugimoto, Qi Tang, Xiaoduo Pan, Peter J. van Oevelen, Daniel Klocke, Myung-Seo Koo, Tomonori Sato, Zhaohui Lin, Yuhei Takaya, Constantin Ardilouze, Stefano Materia, Subodh K. Saha, Retish Senan, Tetsu Nakamura, Hailan Wang, Jing Yang, Hongliang Zhang, Mei Zhao, Xin-Zhong Liang, J. David Neelin, Frederic Vitart, Xin Li, Ping Zhao, Chunxiang Shi, Weidong Guo, Jianping Tang, Miao Yu, Yun Qian, Samuel S. P. Shen, Yang Zhang, Kun Yang, Ruby Leung, Yuan Qiu, Daniele Peano, Xin Qi, Yanling Zhan, Michael A. Brunke, Sin Chan Chou, Michael Ek, Tianyi Fan, Hong Guan, Hai Lin, Shunlin Liang, Helin Wei, Shaocheng Xie, Haoran Xu, Weiping Li, Xueli Shi, Paulo Nobre, Yan Pan, Yi Qin, Jeff Dozier, Craig R. Ferguson, Gianpaolo Balsamo, Qing Bao, Jinming Feng, Jinkyu Hong, Songyou Hong, Huilin Huang, Duoying Ji, Zhenming Ji, Shichang Kang, Yanluan Lin, Weiguang Liu, Ryan Muncaster, Patricia de Rosnay, Hiroshi G. Takahashi, Guiling Wang, Shuyu Wang, Weicai Wang, Xu Zhou, and Yuejian Zhu
Geosci. Model Dev., 14, 4465–4494, https://doi.org/10.5194/gmd-14-4465-2021, https://doi.org/10.5194/gmd-14-4465-2021, 2021
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The subseasonal prediction of extreme hydroclimate events such as droughts/floods has remained stubbornly low for years. This paper presents a new international initiative which, for the first time, introduces spring land surface temperature anomalies over high mountains to improve precipitation prediction through remote effects of land–atmosphere interactions. More than 40 institutions worldwide are participating in this effort. The experimental protocol and preliminary results are presented.
In-Sun Song, Changsup Lee, Hye-Yeong Chun, Jeong-Han Kim, Geonhwa Jee, Byeong-Gwon Song, and Julio T. Bacmeister
Atmos. Chem. Phys., 20, 7617–7644, https://doi.org/10.5194/acp-20-7617-2020, https://doi.org/10.5194/acp-20-7617-2020, 2020
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A modeling study on the effects of propagation of atmospheric gravity waves is carried out for the 2009 sudden stratospheric warming (SSW) event. It is found that gravity-wave-induced momentum fluxes are significantly affected by horizontal refraction and the Earth's curvature effects. Gravity wave convergence and effects of ray geometry also have some impact. In the evolution of the SSW, significantly enhanced momentum fluxes are likely to change nonlocally nearby large-scale vortex structures.
Junhong Lee, Jinkyu Hong, Yign Noh, and Pedro A. Jiménez
Geosci. Model Dev., 13, 521–536, https://doi.org/10.5194/gmd-13-521-2020, https://doi.org/10.5194/gmd-13-521-2020, 2020
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As the computing power increases, the grid size of atmospheric models moves toward the gray zone of turbulence (the scales on the order of the energy-containing range). Nevertheless, the roughness sublayer, which is a compartment of the inertial sublayer, has not been considered in high-resolution mesoscale models. This study coupled a roughness sublayer parameterization into the Weather Research and Forecasting model and evaluated its performance to simulate climate near the Earth's surface.
Anne Dallmeyer, Martin Claussen, Stephan J. Lorenz, and Timothy Shanahan
Clim. Past, 16, 117–140, https://doi.org/10.5194/cp-16-117-2020, https://doi.org/10.5194/cp-16-117-2020, 2020
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We analyse the end of the African humid period (AHP) in a transient Holocene simulation performed with the comprehensive Earth system model MPI-ESM1.2. The model reproduces the time-transgressive end of the AHP evident in proxy data and indicates that changes in moisture can be attributed to the retreat of the summer monsoon and to changes in the extratropical troughs. The spatially varying impact of these systems imposes regionally different responses to the Holocene insolation change.
Junsu Gil, Jeonghwan Kim, Meehye Lee, Gangwoong Lee, Dongsoo Lee, Jinsang Jung, Joonyeong An, Jinkyu Hong, Seogju Cho, Jeonghoon Lee, and Russell Long
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-1012, https://doi.org/10.5194/acp-2019-1012, 2019
Preprint withdrawn
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During the KORUS-AQ campaign, nitrous acid (HONO) concentrations in Seoul were higher in high-O3 episodes than non-episodes. The photochemical model simulation demonstrates the role of HONO in promoting O3 formation through OH production and subsequent VOCs oxidation. The ambient HONO concentrations were reasonably represented by an Artificial Neural Network model, highlighting NOx, surface area, and relative humidity as crucial parameters for HONO formation in Seoul under high NOx conditions.
Young-Ha Kim, George N. Kiladis, John R. Albers, Juliana Dias, Masatomo Fujiwara, James A. Anstey, In-Sun Song, Corwin J. Wright, Yoshio Kawatani, François Lott, and Changhyun Yoo
Atmos. Chem. Phys., 19, 10027–10050, https://doi.org/10.5194/acp-19-10027-2019, https://doi.org/10.5194/acp-19-10027-2019, 2019
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Reanalyses are widely used products of meteorological variables, generated using observational data and assimilation systems. We compare six modern reanalyses, with focus on their representation of equatorial waves which are important in stratospheric variability and stratosphere–troposphere exchange. Agreement/spreads among the reanalyses in the spectral properties and spatial distributions of the waves are examined, and satellite impacts on the wave representation in reanalyses are discussed.
Victor Brovkin, Stephan Lorenz, Thomas Raddatz, Tatiana Ilyina, Irene Stemmler, Matthew Toohey, and Martin Claussen
Biogeosciences, 16, 2543–2555, https://doi.org/10.5194/bg-16-2543-2019, https://doi.org/10.5194/bg-16-2543-2019, 2019
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Mechanisms of atmospheric CO2 growth by 20 ppm from 6000 BCE to the pre-industrial period are still uncertain. We apply the Earth system model MPI-ESM-LR for two transient simulations of the climate–carbon cycle. An additional process, e.g. carbonate accumulation on shelves, is required for consistency with ice-core CO2 data. Our simulations support the hypothesis that the ocean was a source of CO2 until the late Holocene when anthropogenic CO2 sources started to affect atmospheric CO2.
Anne Dallmeyer, Martin Claussen, and Victor Brovkin
Clim. Past, 15, 335–366, https://doi.org/10.5194/cp-15-335-2019, https://doi.org/10.5194/cp-15-335-2019, 2019
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A simple but powerful method for the biomisation of plant functional type distributions is introduced and tested for six different dynamic global vegetation models based on pre-industrial and palaeo-simulations. The method facilitates the direct comparison between vegetation distributions simulated by different Earth system models and between model results and the pollen-based biome reconstructions. It is therefore a powerful tool for the evaluation of Earth system models.
Uwe Mikolajewicz, Florian Ziemen, Guido Cioni, Martin Claussen, Klaus Fraedrich, Marvin Heidkamp, Cathy Hohenegger, Diego Jimenez de la Cuesta, Marie-Luise Kapsch, Alexander Lemburg, Thorsten Mauritsen, Katharina Meraner, Niklas Röber, Hauke Schmidt, Katharina D. Six, Irene Stemmler, Talia Tamarin-Brodsky, Alexander Winkler, Xiuhua Zhu, and Bjorn Stevens
Earth Syst. Dynam., 9, 1191–1215, https://doi.org/10.5194/esd-9-1191-2018, https://doi.org/10.5194/esd-9-1191-2018, 2018
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Model experiments show that changing the sense of Earth's rotation has relatively little impact on the globally and zonally averaged energy budgets but leads to large shifts in continental climates and patterns of precipitation. The retrograde world is greener as the desert area shrinks. Deep water formation shifts from the North Atlantic to the North Pacific with subsequent changes in ocean overturning. Over large areas of the Indian Ocean, cyanobacteria dominate over bulk phytoplankton.
Changsup Lee, Geonhwa Jee, Jeong-Han Kim, and In-Sun Song
Ann. Geophys., 36, 1267–1274, https://doi.org/10.5194/angeo-36-1267-2018, https://doi.org/10.5194/angeo-36-1267-2018, 2018
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This study shows the width of the meteor height distribution (FWHM) is well correlated with the atmospheric pressure, not only experimentally but theoretically. From the correlation analysis, we found that the FWHM provides the best estimation of the temperature at the height layer below the meteor peak height by 2–3 km. We also proved a meteor echo height ceiling effect (MHC) is primarily controlled by the atmospheric conditions, and this enables the FWHM to estimate the temperature accurately.
Wenfu Tang, Avelino F. Arellano, Joshua P. DiGangi, Yonghoon Choi, Glenn S. Diskin, Anna Agustí-Panareda, Mark Parrington, Sebastien Massart, Benjamin Gaubert, Youngjae Lee, Danbi Kim, Jinsang Jung, Jinkyu Hong, Je-Woo Hong, Yugo Kanaya, Mindo Lee, Ryan M. Stauffer, Anne M. Thompson, James H. Flynn, and Jung-Hun Woo
Atmos. Chem. Phys., 18, 11007–11030, https://doi.org/10.5194/acp-18-11007-2018, https://doi.org/10.5194/acp-18-11007-2018, 2018
Sabine Egerer, Martin Claussen, and Christian Reick
Clim. Past, 14, 1051–1066, https://doi.org/10.5194/cp-14-1051-2018, https://doi.org/10.5194/cp-14-1051-2018, 2018
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We find a rapid increase in simulated dust deposition between 6 and
4 ka BP that is fairly consistent with an abrupt change in dust deposition that was observed in marine sediment records at around 5 ka BP. This rapid change is caused by a rapid increase in simulated dust emissions in the western Sahara due to a fast decline in vegetation cover and a locally strong reduction of lake area. Our study identifies spatial and temporal heterogeneity in the transition of the North African landscape.
Sirisha Kalidindi, Christian H. Reick, Thomas Raddatz, and Martin Claussen
Earth Syst. Dynam., 9, 739–756, https://doi.org/10.5194/esd-9-739-2018, https://doi.org/10.5194/esd-9-739-2018, 2018
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Using climate simulations, we investigate the role of water recycling in shaping the climate of low-obliquity Earth-like terra-planets. By such a mechanism feeding water back from the extra-tropics to the tropics, the planet can assume two drastically different climate states differing by more than 35 K in global temperature. We describe the bifurcation between the two states occurring upon changes in surface albedo and argue that the bistability hints at a wider habitable zone for such planets.
Markus Adloff, Christian H. Reick, and Martin Claussen
Earth Syst. Dynam., 9, 413–425, https://doi.org/10.5194/esd-9-413-2018, https://doi.org/10.5194/esd-9-413-2018, 2018
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Computer simulations show that during an ice age a strong atmospheric CO2 increase would have resulted in stronger carbon uptake of the continents than today. Causes are the larger potential of glacial vegetation to increase its photosynthetic efficiency under increasing CO2 and the smaller amount of carbon in extratropical soils during an ice age that can be released under greenhouse warming. Hence, for different climates the Earth system is differently sensitive to carbon cycle perturbations.
Vivienne P. Groner, Thomas Raddatz, Christian H. Reick, and Martin Claussen
Biogeosciences, 15, 1947–1968, https://doi.org/10.5194/bg-15-1947-2018, https://doi.org/10.5194/bg-15-1947-2018, 2018
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We show that plant functional diversity significantly affects climate–vegetation interaction and the climate–vegetation system stability in response to external forcing using a series of coupled land–atmosphere simulation. Our findings raise the question of how realistically Earth system models can actually represent climate–vegetation interaction, considering the incomplete representation of plant functional diversity in the current generation of land surface models.
Anne Dallmeyer, Martin Claussen, Jian Ni, Xianyong Cao, Yongbo Wang, Nils Fischer, Madlene Pfeiffer, Liya Jin, Vyacheslav Khon, Sebastian Wagner, Kerstin Haberkorn, and Ulrike Herzschuh
Clim. Past, 13, 107–134, https://doi.org/10.5194/cp-13-107-2017, https://doi.org/10.5194/cp-13-107-2017, 2017
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The vegetation distribution in eastern Asia is supposed to be very sensitive to climate change. Since proxy records are scarce, hitherto a mechanistic understanding of the past spatio-temporal climate–vegetation relationship is lacking. To assess the Holocene vegetation change, we forced the diagnostic biome model BIOME4 with climate anomalies of different transient climate simulations.
Alexander Lemburg, Martin Claussen, and Felix Ament
Clim. Past Discuss., https://doi.org/10.5194/cp-2016-68, https://doi.org/10.5194/cp-2016-68, 2016
Manuscript not accepted for further review
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The deforestation of Easter Island several hundred years ago might have influenced its local near-surface climate. With a series of numerical model experiments we investigate the impact of deforestation on precipitation and near-surface climate. We find that a deforested Easter Island appears to be significantly less resistant to drought than a forested island and thus, deforestation has probably exacerbated the effects of past climate drought spells on Easter Island's socio-ecological systems.
Ulrike Port, Martin Claussen, and Victor Brovkin
Earth Syst. Dynam., 7, 535–547, https://doi.org/10.5194/esd-7-535-2016, https://doi.org/10.5194/esd-7-535-2016, 2016
Young-Ha Kim, Hye-Yeong Chun, Sang-Hun Park, In-Sun Song, and Hyun-Joo Choi
Atmos. Chem. Phys., 16, 4799–4815, https://doi.org/10.5194/acp-16-4799-2016, https://doi.org/10.5194/acp-16-4799-2016, 2016
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We investigated the characteristics of atmospheric gravity waves that are generated in a baroclinic life cycle simulation using a high-resolution global model. We analysed the spatiotemporal scales, vertical-propagation aspects, and sources of the gravity waves as well as their phase-velocity spectrum. The wave characteristics investigated in this study are crucial information for parameterizing gravity waves in large-scale models.
Sabine Egerer, Martin Claussen, Christian Reick, and Tanja Stanelle
Clim. Past, 12, 1009–1027, https://doi.org/10.5194/cp-12-1009-2016, https://doi.org/10.5194/cp-12-1009-2016, 2016
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We demonstrate for the first time the direct link between dust accumulation in marine sediment cores and Saharan land surface by simulating the mid-Holocene and pre-industrial dust cycle as a function of Saharan land surface cover and atmosphere-ocean conditions using the coupled atmosphere-aerosol model ECHAM6-HAM2.1. Mid-Holocene surface characteristics, including vegetation cover and lake surface area, are derived from proxy data and simulations.
T. Brücher, M. Claussen, and T. Raddatz
Earth Syst. Dynam., 6, 769–780, https://doi.org/10.5194/esd-6-769-2015, https://doi.org/10.5194/esd-6-769-2015, 2015
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A major link between climate and humans in northern Africa, and the Sahel in particular, is land use. We assess possible feedbacks between the type of land use and harvest intensity and climate by analysing a series of idealized GCM experiments using the MPI-ESM. Our study suggests marginal feedback between land use changes and climate changes triggered by strong greenhouse gas emissions.
U. Port and M. Claussen
Clim. Past, 11, 1563–1574, https://doi.org/10.5194/cp-11-1563-2015, https://doi.org/10.5194/cp-11-1563-2015, 2015
V. P. Groner, M. Claussen, and C. Reick
Clim. Past, 11, 1361–1374, https://doi.org/10.5194/cp-11-1361-2015, https://doi.org/10.5194/cp-11-1361-2015, 2015
U. Port, M. Claussen, and V. Brovkin
Clim. Past Discuss., https://doi.org/10.5194/cpd-11-997-2015, https://doi.org/10.5194/cpd-11-997-2015, 2015
Revised manuscript not accepted
A. Dallmeyer, M. Claussen, N. Fischer, K. Haberkorn, S. Wagner, M. Pfeiffer, L. Jin, V. Khon, Y. Wang, and U. Herzschuh
Clim. Past, 11, 305–326, https://doi.org/10.5194/cp-11-305-2015, https://doi.org/10.5194/cp-11-305-2015, 2015
F. S. E. Vamborg, V. Brovkin, and M. Claussen
Earth Syst. Dynam., 5, 89–101, https://doi.org/10.5194/esd-5-89-2014, https://doi.org/10.5194/esd-5-89-2014, 2014
M. M. Hurwitz, L. D. Oman, P. A. Newman, and I.-S. Song
Atmos. Chem. Phys., 13, 12187–12197, https://doi.org/10.5194/acp-13-12187-2013, https://doi.org/10.5194/acp-13-12187-2013, 2013
M. Claussen, K. Selent, V. Brovkin, T. Raddatz, and V. Gayler
Biogeosciences, 10, 3593–3604, https://doi.org/10.5194/bg-10-3593-2013, https://doi.org/10.5194/bg-10-3593-2013, 2013
Related subject area
Subject: Vegetation Dynamics | Archive: Modelling only | Timescale: Holocene
The challenge of comparing pollen-based quantitative vegetation reconstructions with outputs from vegetation models – a European perspective
How does the explicit treatment of convection alter the precipitation–soil hydrology interaction in the mid-Holocene African humid period?
Holocene vegetation transitions and their climatic drivers in MPI-ESM1.2
The end of the African humid period as seen by a transient comprehensive Earth system model simulation of the last 8000 years
Harmonising plant functional type distributions for evaluating Earth system models
Controls on fire activity over the Holocene
North African vegetation–precipitation feedback in early and mid-Holocene climate simulations with CCSM3-DGVM
Comparing modelled fire dynamics with charcoal records for the Holocene
Climate and CO2 modulate the C3/C4 balance and δ13C signal in simulated vegetation
Anne Dallmeyer, Anneli Poska, Laurent Marquer, Andrea Seim, and Marie-José Gaillard
Clim. Past, 19, 1531–1557, https://doi.org/10.5194/cp-19-1531-2023, https://doi.org/10.5194/cp-19-1531-2023, 2023
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We compare past tree cover changes in Europe during the last 8000 years simulated with two dynamic global vegetation models and inferred from pollen data. The major model–data mismatch is related to the much earlier onset of anthropogenic deforestation in the data compared to the prescribed land use in the models. We show that land use, and not climate, is the main driver of the Holocene forest decline. The model–data agreement depends on the model tuning, challenging model–data comparisons.
Leonore Jungandreas, Cathy Hohenegger, and Martin Claussen
Clim. Past, 19, 637–664, https://doi.org/10.5194/cp-19-637-2023, https://doi.org/10.5194/cp-19-637-2023, 2023
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Increasing the vegetation cover over mid-Holcocene North Africa expands the West African monsoon ∼ 4–5° further north. This northward shift of monsoonal precipitation is caused by interactions of the land surface with large-scale monsoon circulation and the coupling of soil moisture to precipitation. We highlight the importance of considering not only how soil moisture influences precipitation but also how different precipitation characteristics alter the soil hydrology via runoff generation.
Anne Dallmeyer, Martin Claussen, Stephan J. Lorenz, Michael Sigl, Matthew Toohey, and Ulrike Herzschuh
Clim. Past, 17, 2481–2513, https://doi.org/10.5194/cp-17-2481-2021, https://doi.org/10.5194/cp-17-2481-2021, 2021
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Using the comprehensive Earth system model, MPI-ESM1.2, we explore the global Holocene vegetation changes and interpret them in terms of the Holocene climate change. The model results reveal that most of the Holocene vegetation transitions seen outside the high northern latitudes can be attributed to modifications in the intensity of the global summer monsoons.
Anne Dallmeyer, Martin Claussen, Stephan J. Lorenz, and Timothy Shanahan
Clim. Past, 16, 117–140, https://doi.org/10.5194/cp-16-117-2020, https://doi.org/10.5194/cp-16-117-2020, 2020
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We analyse the end of the African humid period (AHP) in a transient Holocene simulation performed with the comprehensive Earth system model MPI-ESM1.2. The model reproduces the time-transgressive end of the AHP evident in proxy data and indicates that changes in moisture can be attributed to the retreat of the summer monsoon and to changes in the extratropical troughs. The spatially varying impact of these systems imposes regionally different responses to the Holocene insolation change.
Anne Dallmeyer, Martin Claussen, and Victor Brovkin
Clim. Past, 15, 335–366, https://doi.org/10.5194/cp-15-335-2019, https://doi.org/10.5194/cp-15-335-2019, 2019
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A simple but powerful method for the biomisation of plant functional type distributions is introduced and tested for six different dynamic global vegetation models based on pre-industrial and palaeo-simulations. The method facilitates the direct comparison between vegetation distributions simulated by different Earth system models and between model results and the pollen-based biome reconstructions. It is therefore a powerful tool for the evaluation of Earth system models.
S. Kloster, T. Brücher, V. Brovkin, and S. Wilkenskjeld
Clim. Past, 11, 781–788, https://doi.org/10.5194/cp-11-781-2015, https://doi.org/10.5194/cp-11-781-2015, 2015
R. Rachmayani, M. Prange, and M. Schulz
Clim. Past, 11, 175–185, https://doi.org/10.5194/cp-11-175-2015, https://doi.org/10.5194/cp-11-175-2015, 2015
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The role of vegetation-precipitation feedbacks in modifying the North African rainfall response to enhanced early to mid-Holocene summer insolation is analysed using the climate-vegetation model CCSM3-DGVM. Dynamic vegetation amplifies the positive early to mid-Holocene summer precipitation anomaly by ca. 20% in the Sahara-Sahel region. The primary vegetation feedback operates through surface latent heat flux anomalies by canopy evapotranspiration and their effect on the African easterly jet.
T. Brücher, V. Brovkin, S. Kloster, J. R. Marlon, and M. J. Power
Clim. Past, 10, 811–824, https://doi.org/10.5194/cp-10-811-2014, https://doi.org/10.5194/cp-10-811-2014, 2014
O. Flores, E. S. Gritti, and D. Jolly
Clim. Past, 5, 431–440, https://doi.org/10.5194/cp-5-431-2009, https://doi.org/10.5194/cp-5-431-2009, 2009
Cited articles
Arora, V. K., Katavouta, A., Williams, R. G., Jones, C. D., Brovkin, V., Friedlingstein, P., Schwinger, J., Bopp, L., Boucher, O., Cadule, P., Chamberlain, M. A., Christian, J. R., Delire, C., Fisher, R. A., Hajima, T., Ilyina, T., Joetzjer, E., Kawamiya, M., Koven, C. D., Krasting, J. P., Law, R. M., Lawrence, D. M., Lenton, A., Lindsay, K., Pongratz, J., Raddatz, T., Séférian, R., Tachiiri, K., Tjiputra, J. F., Wiltshire, A., Wu, T., and Ziehn, T.: Carbon–concentration and carbon–climate feedbacks in CMIP6 models and their comparison to CMIP5 models, Biogeosciences, 17, 4173–4222, https://doi.org/10.5194/bg-17-4173-2020, 2020.
Berger, A. L.: Long-Term Variations of Caloric Insolation Resulting from the
Earth's Orbital Elements 1, Quaternary Res., 9, 139–167, 1978.
Bonfils, C., de Noblet-Ducoudre, N., Braconnot, P., and Joussaume, S.: Hot
desert albedo and climate change: Mid-Holocene monsoon in North Africa, J.
Climate, 17, 3724–3737, 2001.
Braconnot, P., Joussaume, S., Marti, O., and de Noblet, N.: Synergistic
Feedbacks from Ocean and Vegetation on the African Monsoon Response to
Mid-Holocene Insolation, Geophys. Res. Lett., 26, 2481–2484, 1999.
Braconnot, P., Zhu, D., Marti, O., and Servonnat, J.: Strengths and challenges for transient Mid- to Late Holocene simulations with dynamical vegetation, Clim. Past, 15, 997–1024, https://doi.org/10.5194/cp-15-997-2019, 2019.
Brooks, M. L.: Effects of increased soil nitrogen on the dominance of alien
annual plants in the Mojave Desert, J. Appl. Ecol., 40, 344–353, 2003.
Broxton, P. D., Zeng, X., Sulla-Menashe, D., and Troch, P. A.: A global land
cover climatology using MODIS data, J. Appl. Meteorol. Clim., 53, 1593–1605, https://doi.org/10.1175/JAMC-D-13-0270.1, 2014.
Castillo, C. K. G., Levis, S., and Thornton, P. E.: Evaluation of the New
CNDV Option of the Community Land Model: Effects of Dynamic Vegetation and
Interactive Nitrogen on CLM4 Means and Variability, J. Climate, 25,
3702–3714, https://doi.org/10.1175/JCLI-D-11-00372.1, 2012.
Cess, R. D.: Biosphere-Albedo Feedback and Climate Modeling, J. Atmos. Sci.,
35, 1765–1768, 1978.
Charney, J. G.: Dynamics of Deserts and Drought in Sahel, Q. J. Roy. Meteor.
Soc., 101, 193–202, 1975.
Chikira, M., Abe-Ouchi, A., and Sumi, A.: General circulation model study on
the green Sahara during the mid-Holocene: an
impact of convection originating above boundary layer, J. Geophys. Res.,
111, D21103, https://doi.org/10.1029/2005JD006398, 2006.
Claussen, M.: On multiple solutions of the atmosphere-vegetation system in
present-day climate, Glob. Change Biol., 4, 549–559, 1998.
Claussen, M., Kubatzki, C., Brovkin, V., Ganoposki, A., Hoelzmann, P., and
Pachur, H. J.: Simulation of an abrupt change in Saharan vegetation in the
mid-Holocene, Geophys. Res. Lett., 26, 2037–2040, 1999.
Claussen, M., Bathiany, S., Brovkin, V., and Kleinen, T.: Simulated
climate-vegetation interaction in semi-arid regions affected by plant
diversity, Nat. Geosci., 6, 954–958, 2013.
Claussen, M., Dallmeyer, A., and Bader, J.: Theory and modeling of the
African humid period and the green Sahara, Oxford Research Encyclopedia of
Climate Science, https://doi.org/10.1093/acrefore/9780190228620.013.532,
2017.
Coe, M. and Bonan, G.: Feedbacks between climate and surface water in
northern Africa during the middle Holocene, J. Geophys. Res., 102,
11087–11101, https://doi.org/10.1029/97JD00343, 1997.
Contoux, C., Jost, A., Ramstein, G., Sepulchre, P., Krinner, G., and Schuster, M.: Megalake Chad impact on climate and vegetation during the late Pliocene and the mid-Holocene, Clim. Past, 9, 1417–1430, https://doi.org/10.5194/cp-9-1417-2013, 2013.
Cook, K. H.: Generation of the African Easterly Jet and its role in determining West African precipitation, J. Climate, 12, 1165–1184, 1999.
Gaetani, M., Messori, G., Zhang, Q., Flamant, C., and Pausata, F. S. R.:
Understanding the Mechanisms behind the Northward Extension of the West
African Monsoon during the Mid-Holocene, J. Climate, 30, 7621–7642,
https://doi.org/10.1175/JCLI-D-16-0299.1, 2017.
Groner, V. P., Raddatz, T., Reick, C. H., and Claussen, M.: Plant functional diversity affects climate–vegetation interaction, Biogeosciences, 15, 1947–1968, https://doi.org/10.5194/bg-15-1947-2018, 2018.
Harrison, S. P., Bartlein, P. J., Izumi, K., Li, G., Annan, J., Hargreaves,
J., Braconnot, P. B., and Kageyama, M.: Implications of evaluation of CMIP5
palaeosimulations for climate projections, Nat. Clim. Change, 5, 735–743, https://doi.org/10.1038/nclimate2649, 2015.
Hély, C., Lézine, A.-M., and contributors, A.: Holocene changes in African vegetation: tradeoff between climate and water availability, Clim. Past, 10, 681–686, https://doi.org/10.5194/cp-10-681-2014, 2014.
Holmes, J. A.: How the Sahara became dry, Science, 320, 752–753, 2008.
Hopcroft, P. O., Valdes, P. J., Harper, A. B., and Beerling, D. J.: Multi
vegetation model evaluation of the Green Sahara climate regime, Geophys.
Res. Lett., 44, 6804–6813, 2017.
Houldcroft, C., Grey, W., Barnsley, M., Taylor, C., Los, S., and North, P.:
New Vegetation Albedo Parameters and Global Fields of Soil Background Albedo
Derived from MODIS for Use in a Climate Model, J. Hydrometeorol., 10,
183–198, 2009.
Hurrell, J. W., Holland, M. M., Gent, P. R., Ghan, S., Kay, J. E., Kushner,
P., Lamarque, J.-F., Large, W. G., Lawrence, D., Lindsay, K., Lipscomb, W.
H., Long, M. C., Mahowald, N., Marsh, D. R., Neale, R. B., Rasch, P.,
Vavrus, S., Vertenstein, M., Bader, D., Collins, W. D., Hack, J. J., Kiehl,
J., and Marshall, S.: The Community Earth System Model: a framework for
collaborative research, B. Am. Meteorol. Soc., 94, 1339–1360, 2013.
Jolly, D., Harrison, S. P., Damnati, B., and Bonnefille, R.: Simulated
climate and biomes of Africa during the Late Quaternary: comparisons with
pollen and lake status data, Quaternary Sci. Rev., 17, 629–657, 1998.
Kluzek, E.: CESM research tools: CLM4 in CESM1.0.4, User's guide
documentation, National Centers for Atmospheric Research, Boulder, USA, https://svn-ccsm-models.cgd.ucar.edu/clm2/branch_tags/cesm1_0_4_rel_tags/cesm1_0_4_n05_clm4_0_32/models/lnd/clm/doc/UsersGuide/clm_ug.xml (last access: 2 February 2022), 2012.
Knorr, W. and Schnitzler, K. G.: Enhanced albedo feedback in North Africa
from possible combined vegetation and soil formation processes, Clim.
Dynam., 26, 55–63, 2006.
Knorr, W., Schnitzler, K. G., and Govaerts, Y.: The role of bright desert
regions in shaping North African climate, Geophys. Res. Lett., 28,
3489–3492, 2001.
Koven, C. D., Riley, W. J., Subin, Z. M., Tang, J. Y., Torn, M. S., Collins, W. D., Bonan, G. B., Lawrence, D. M., and Swenson, S. C.: The effect of vertically resolved soil biogeochemistry and alternate soil C and N models on C dynamics of CLM4, Biogeosciences, 10, 7109–7131, https://doi.org/10.5194/bg-10-7109-2013, 2013.
Krinner, G., Lézine, A. M., Braconnot, P., Sepulchre, P., Ramstein, G.,
Grenier, C., and Gouttevin, I.: A reassessment of lake and wetland feedbacks
on the North African Holocene climate, Geophys. Res. Lett., 39, L07701,
https://doi.org/10.1029/2012GL050992, 2012.
Kutzbach, J., Bonan, G., Foley, J., and Harrison, S.: Vegetation and soil
feedbacks on the response of the African monsoon to orbital forcing in the
early to middle Holocene, Nature, 384, 623–626, 1996.
Kutzbach, J. E.: Monsoon climate of the early Holocene: Climate experiment
with the Earth's orbital parameters for 9000 years ago, Science, 214,
59–61, 1981.
Kutzbach, J. E. and Liu, Z.: Response of the African Monsoon to Orbital
Forcing and Ocean Feedbacks in the Middle Holocene, Science, 278, 440–443,
1997.
Kutzbach, J. E. and Street-Perrott, F. A.: Milankovitch forcing of
fluctuations in the level of tropical lakes from 18 to 0 kyr BP, Nature,
317, 130–134, 1985.
Larrasoana, J. C., Roberts, A. P., and Rohling, E. J.: Dynamics of Green
Sahara periods and their role in Hominin evolution, PLoS ONE, 8, e76514,
https://doi.org/10.1371/journal.pone.0076514, 2013.
Lawrence, D. M., Oleson, K. W., Flanner, M. G., Thorton, P. E., Swenson, S.
C., Lawrence, P. J., Zeng, X., Yang, Z.-L., Levis, S., Skaguchi, K., Bonan,
G. B., and Slater, A. G.: Parameterization improvements and functional and
structural advances in version 4 of the Community Land Model, J. Adv. Model.
Earth Sy., 3, 2011MS000045, https://doi.org/10.1029/2011ms000045, 2011.
Leblanc, M., Favreau, G., Maley, J., Nazoumou, Y., Leduc, C., Stagnitti, F.,
van Oevelen, P. J., Delclaux, F., and Lemoalle, J.: Reconstruction of
Megalake Chad using Shuttle Radar Topographic Mission data, Palaeogeogr.
Palaeocl., 239, 16–27, https://doi.org/10.1016/j.palaeo.2006.01.003, 2006.
Lee, J. and Hong, J.: Model output data, Zenodo [data set], https://doi.org/10.5281/zenodo.5788013, 2021.
Levine, X. J. and Boos, W. R.: Land surface albedo bias in climate models
and its association with tropical rainfall, Geophys. Res. Lett., 44,
6363–6372, 2017.
Levis, B. S., Bonan, G. B., and Bonfils, C.: Soil feedback drives the
mid-Holocene North African monsoon northward in fully coupled CCSM2
simulations with a dynamic vegetation model, Clim. Dynam., 23, 791–802,
https://doi.org/10.1007/s00382-004-0477-y, 2004.
Lu, Z., Miller, P. A., Zhang, Q., Zhang, Q., Wårlind, D., Nieradzik, L.,
Sjolte, J., and Smith, B.: Dynamic vegetation simulations of the
mid-Holocene Green Sahara, Geophys. Res. Lett., 45, 8294–8303, 2018.
Neale, R. B., Richter, J., Park, S., Lauritzen, P. H., Vavrus, S. J., Rasch,
P. J., and Zhang, M.: The Mean Climate of the Community Atmosphere Model
(CAM4) in Forced SST and Fully Coupled Experiments, J. Climate, 26,
5150–5168, https://doi.org/10.1175/JCLI-D-12-00236.1, 2013.
Oleson, K. W., Lawrence, D. M., Bonan, G. B., Flanner, M. G., Kluzek, E.,
Lawrence, P. J., Levis, S., Swenson, S. C., Thornton, P. E., Dai, A.,
Decker, M., Dickinson, R., Feddema, J., Heald, C. L., Hoffman, F., Lamarque,
J.-F., Mahowald, N., Niu, G.-Y., Qian, T., Randerson, J., Running, S.,
Sakaguchi, K., Slater, A., Stockli, R., Wang, A., Yang, Z.-L., Zeng, X., and
Zeng, X.: Technical Description of version 4.0 of the Community Land Model
(CLM), Tech. Rep. NCAR/TN-478+STR, National Center for Atmospheric
Research, Boulder, Colorado, USA, 2010.
Pachur, H. J. and Kröpelin, S.: Wadi Howar–Paleoclimatic evidence from an extinct river system in the Southeastern Sahara, Science, 237, 298–300, 1987.
Pausata, F. S. R., Messori, G., and Zhang, Q.: Impacts of dust reduction on
the northward expansion of the African monsoon during the Green Sahara
period, Earth Planet. Sc. Lett., 434, 298–307, 2016.
Pausata, F. S. R., Gaetani, M., Messori, G., Berg, A., de Souza, D. M., Sage,
R. F., and deMenocal, P. B.: The Greening of the Sahara: Past Changes and
Future Implications, One Earth, 2, 235–250, 2020.
Quade, J., Dente, E., Armon, M., Dor, Y. B., Morin, E., Adam, O., and Enzel,
Y.: Megalakes in the Sahara? A review, Quaternary Res., 90, 253–275, 2018.
Rachmayani, R., Prange, M., and Schulz, M.: North African vegetation–precipitation feedback in early and mid-Holocene climate simulations with CCSM3-DGVM, Clim. Past, 11, 175–185, https://doi.org/10.5194/cp-11-175-2015, 2015.
Schuster, M., Roquin, C., Duringer, P., Brunet, M., Caugy, M., Fontugne, M.,
Mackaye, H. T., Vignaud, P., and Ghienne, J. F.: Holocene Lake Mega-Chad
palaeoshorelines from space, Quaternary Sci. Rev., 24, 1821–1827, 2005.
Shanahan, T. M., McKay, N. P., Hughen, K. A., Overpeck, J. T.,
Otto-Bliesner, B., Heil, C. W., King, J., Scholz, C. A., and Peck, J.: The
time-transgressive termination of the African Humid Period, Nat. Geosci., 8,
140–144, https://doi.org/10.1038/ngeo2329, 2015.
Takata, K., Emori, S., and Watanabe, T.: Development of the minimal advanced
treatments of surface interaction and runoff, Global Planet. Change, 38,
209–222, https://doi.org/10.1016/S0921-8181(03)00030-4, 2003.
Thornton, P. E. and Rosenbloom, N. A.: Ecosystem model spin-up: Estimating steady
state conditions in a coupled terrestrial carbon and nitrogen cycle model,
Ecol. Model., 189, 25–48, https://doi.org/10.1016/j.ecolmodel.2005.04.008, 2005.
Thornton, P. E., Law, B. E., Gholz, H. L., Clark, K. L., Falge, E.,
Ellsworth, D. S., Goldstein, A. H., Monson, R. K., Hollinger, D., Falk, M.,
Chen, J., and Sparks, J. P.: Modeling and measuring the effects of
disturbance history and climate on carbon and water budgets in evergreen
needleleaf forests, Agr. Forest Meteorol., 113, 185–222,
https://doi.org/10.1016/S0168-1923(02)00108-9, 2002.
Thornton, P. E., Lamarque, J.-F., Rosenbloom, N. A., and Mahowald, N. M.:
Influence of carbon-nitrogen cycle coupling on land model response to CO2
fertilization and climate variability, Global Biogeochem. Cy., 21, GB4018,
https://doi.org/10.1029/2006GB002868, 2007.
Thornton, P. E., Doney, S. C., Lindsay, K., Moore, J. K., Mahowald, N., Randerson, J. T., Fung, I., Lamarque, J.-F., Feddema, J. J., and Lee, Y.-H.: Carbon-nitrogen interactions regulate climate-carbon cycle feedbacks: results from an atmosphere-ocean general circulation model, Biogeosciences, 6, 2099–2120, https://doi.org/10.5194/bg-6-2099-2009, 2009.
Tierney, J. E., Pausata, F. S., and deMenocal, P. B.: Rainfall regimes of
the Green Sahara, Sci. Adv., 3, e1601503,
https://doi.org/10.1126/sciadv.1601503, 2017.
Vamborg, F. S. E., Brovkin, V., and Claussen, M.: The effect of a dynamic background albedo scheme on Sahel/Sahara precipitation during the mid-Holocene, Clim. Past, 7, 117–131, https://doi.org/10.5194/cp-7-117-2011, 2011.
Wang, Y., Li, Y., Ye, X., Chu, Y., and Wang, X.: Profile storage of
organic/inorganic carbon in soil: From forest to desert, Sci. Total
Environ., 408, 1925–1931, https://doi.org/10.1016/j.scitotenv.2010.01.015, 2010.
Watanabe, M., Suzuki, T., O'ishi, R., Komuro, Y., Watanabe, S., Emori, S.,
Takemura, T., Chikira, M., Ogura, T., Sekiguchi, M., Takata, K., Yamazaki,
D., Yokohata, T., Nozawa, T., Hasumi, H., Tatebe, H., and Kimoto, M.:
Improved Climate Simulation by MIROC5: Mean States, Variability, and Climate
Sensitivity, J. Climate, 23, 6312–6335, https://doi.org/10.1175/2010JCLI3679.1, 2010.
Wu, M. L. C., Reale, O., Schubert, S. D., Suarez, M. J., Koster, R. D., and
Pegion, P. J.: African easterly jet: Structure and maintenance, J. Climate,
22, 4459–4480, https://doi.org/10.1175/2009JCLI2584.1, 2009.
Yang, R., Su, Y., Wang, M., Wang, T., Yang, X., Fan, G., and Wu, T.: Spatial
pattern of soil organic carbon in desert grasslands of the diluvial-alluvial
plains of northern Qilian Mountains, J. Arid Land, 6, 136–144, 2014.
Zeng, X.: Overview of soil, vegetation, and snow albedos in weather and climate models, Annual meeting of the American Meteorological Society, San Diego, USA, 13 January 2005.
Short summary
It is still a challenge to simulate the so–called Green Sahara (GS), which was a wet and vegetative Sahara region in the mid–Holocene, using current climate models. Our analysis shows that Holocene greening is simulated better if the amount of soil nitrogen and soil texture is properly modified for the humid and vegetative GS period. Future climate simulation needs to consider consequent changes in soil nitrogen and texture with changes in vegetation cover for proper climate simulations.
It is still a challenge to simulate the so–called Green Sahara (GS), which was a wet and...
