Articles | Volume 18, issue 8
https://doi.org/10.5194/cp-18-1849-2022
© 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-18-1849-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Climate signals in stable carbon and hydrogen isotopes of lignin methoxy groups from southern German beech trees
Anna Wieland
CORRESPONDING AUTHOR
Institute of Earth Sciences, Heidelberg University, Im Neuenheimer
Feld 234–236, 69120 Heidelberg, Germany
Markus Greule
Institute of Earth Sciences, Heidelberg University, Im Neuenheimer
Feld 234–236, 69120 Heidelberg, Germany
Philipp Roemer
Department of Geography, Johannes Gutenberg University Mainz, 55128
Mainz, Germany
Jan Esper
Department of Geography, Johannes Gutenberg University Mainz, 55128
Mainz, Germany
Global Change Research Institute of the Czech Academy of Sciences
(CzechGlobe), 60300 Brno, Czech Republic
Frank Keppler
CORRESPONDING AUTHOR
Institute of Earth Sciences, Heidelberg University, Im Neuenheimer
Feld 234–236, 69120 Heidelberg, Germany
Heidelberg Center for the Environment (HCE), Heidelberg University,
69120 Heidelberg, Germany
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Fredrik Charpentier Ljungqvist, Bo Christiansen, Jan Esper, Heli Huhtamaa, Lotta Leijonhufvud, Christian Pfister, Andrea Seim, Martin Karl Skoglund, and Peter Thejll
Clim. Past, 19, 2463–2491, https://doi.org/10.5194/cp-19-2463-2023, https://doi.org/10.5194/cp-19-2463-2023, 2023
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We study the climate signal in long harvest series from across Europe between the 16th and 18th centuries. The climate–harvest yield relationship is found to be relatively weak but regionally consistent and similar in strength and sign to modern climate–harvest yield relationships. The strongest climate–harvest yield patterns are a significant summer soil moisture signal in Sweden, a winter temperature and precipitation signal in Switzerland, and spring temperature signals in Spain.
Moritz Schroll, Frank Keppler, Markus Greule, Christian Eckhardt, Holger Zorn, and Katharina Lenhart
Biogeosciences, 17, 3891–3901, https://doi.org/10.5194/bg-17-3891-2020, https://doi.org/10.5194/bg-17-3891-2020, 2020
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Fungi have recently been identified to produce the greenhouse gas methane. Here, we investigated the stable carbon isotope values of methane produced by saprotrophic fungi. Our results show that stable isotope values of methane from fungi are dependent on the fungal species and the metabolized substrate. They cover a broad range and overlap with stable carbon isotope values of methane reported for methanogenic archaea, the thermogenic degradation of organic matter, and other eukaryotes.
Lara Klippel, Scott St. George, Ulf Büntgen, Paul J. Krusic, and Jan Esper
Clim. Past, 16, 729–742, https://doi.org/10.5194/cp-16-729-2020, https://doi.org/10.5194/cp-16-729-2020, 2020
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The PAGES2k multiproxy database offers a new and unique opportunity to study the lack of long-term cooling trends in tree-ring data, which can be expected in Northern Hemisphere summers, particularly in the high latitudes, due to orbitally driven changes in solar irradiance. Tests of different influencing factors reveal that preserving millennial-scale cooling trends related to orbital forcing is not feasible in most tree-ring datasets.
Bernd R. Schöne, Aliona E. Meret, Sven M. Baier, Jens Fiebig, Jan Esper, Jeffrey McDonnell, and Laurent Pfister
Hydrol. Earth Syst. Sci., 24, 673–696, https://doi.org/10.5194/hess-24-673-2020, https://doi.org/10.5194/hess-24-673-2020, 2020
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We present the first annually resolved stable isotope record (1819–1998) from shells of Swedish river mussels. Data reflect hydrological processes in the catchment and changes in the isotope value of local precipitation. The latter is related to the origin of moisture from which precipitation formed (North Atlantic or the Arctic) and governed by large-scale atmospheric circulation patterns. Results help to better understand climate dynamics and constrain ecological changes in river ecosystems.
Thomas Klintzsch, Gerald Langer, Gernot Nehrke, Anna Wieland, Katharina Lenhart, and Frank Keppler
Biogeosciences, 16, 4129–4144, https://doi.org/10.5194/bg-16-4129-2019, https://doi.org/10.5194/bg-16-4129-2019, 2019
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Marine algae might contribute to the observed methane oversaturation in oxic waters, but so far direct evidence for methane production by marine algae is limited. We investigated three widespread haptophytes for methane formation. Our results provide unambiguous evidence that all investigated marine algae produce methane per se and at substantial rates. We conclude that each of the three algae studied here could substantially account for the methane production observed in field studies.
Simon Michael Ritter, Margot Isenbeck-Schröter, Christian Scholz, Frank Keppler, Johannes Gescher, Lukas Klose, Nils Schorndorf, Jerónimo Avilés Olguín, Arturo González-González, and Wolfgang Stinnesbeck
Biogeosciences, 16, 2285–2305, https://doi.org/10.5194/bg-16-2285-2019, https://doi.org/10.5194/bg-16-2285-2019, 2019
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Unique and spectacular under water speleothems termed as Hells Bells were recently reported from sinkholes (cenotes) of the Yucatán Peninsula, Mexico. However, the mystery of their formation remained unresolved. Here, we present detailed geochemical analyses and delineate that the growth of Hells Bells results from a combination of biogeochemical processes and variable hydraulic conditions within the cenote.
Enno Bahlmann, Frank Keppler, Julian Wittmer, Markus Greule, Heinz Friedrich Schöler, Richard Seifert, and Cornelius Zetzsch
Atmos. Chem. Phys., 19, 1703–1719, https://doi.org/10.5194/acp-19-1703-2019, https://doi.org/10.5194/acp-19-1703-2019, 2019
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Chloromethane is the most important natural carrier of chlorine to the stratosphere. From a newly determined carbon isotope effect of −11.2 ‰ for the tropospheric loss of CH3Cl we derive a tropical rainforest CH3Cl source of 670 ± 200 Gg a−1, 60 % smaller than previous estimates. A revision of previous bottom-up estimates using above-ground biomass instead of rainforest area strongly supports this lower estimate. Our results suggest a large unknown tropical value of 1530 ± 200 Gg a−1.
Tobias Anhäuser, Birgit Sehls, Werner Thomas, Claudia Hartl, Markus Greule, Denis Scholz, Jan Esper, and Frank Keppler
Clim. Past Discuss., https://doi.org/10.5194/cp-2019-8, https://doi.org/10.5194/cp-2019-8, 2019
Revised manuscript not accepted
Frank Keppler, Enno Bahlmann, Markus Greule, Heinz Friedrich Schöler, Julian Wittmer, and Cornelius Zetzsch
Atmos. Chem. Phys., 18, 6625–6635, https://doi.org/10.5194/acp-18-6625-2018, https://doi.org/10.5194/acp-18-6625-2018, 2018
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Chloromethane is involved in stratospheric ozone depletion, but detailed knowledge of its global budget is missing. In this study stable hydrogen isotope analyses were performed to investigate the dominant loss process for atmospheric chloromethane with photochemically produced hydroxyl radicals. The findings might have significant implications for the use of stable isotope signatures in elucidation of global chloromethane cycling.
Ernesto Tejedor, Miguel Ángel Saz, José María Cuadrat, Jan Esper, and Martín de Luis
Clim. Past, 13, 93–105, https://doi.org/10.5194/cp-13-93-2017, https://doi.org/10.5194/cp-13-93-2017, 2017
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Through this study, and inferred from 316 series of tree-ring width, we developed a maximum temperature reconstruction that is significant for much of the Iberian Peninsula (IP). This reconstruction will not only help to understand the past climate of the IP but also serve to improve future climate change scenarios particularly affecting the Mediterranean area.
Katharina Lenhart, Thomas Klintzsch, Gerald Langer, Gernot Nehrke, Michael Bunge, Sylvia Schnell, and Frank Keppler
Biogeosciences, 13, 3163–3174, https://doi.org/10.5194/bg-13-3163-2016, https://doi.org/10.5194/bg-13-3163-2016, 2016
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In this study we investigated marine algae as a source of CH4 in oxic surface waters of oceans. Algae-derived CH4 may explain the CH4 oversaturating state within the surface mixed layer, sometimes also termed the "oceanic methane paradox".
This finding of an overlooked source of CH4 in marine environments will be of considerable importance to scientists in many disciplines because algae play a crucial role in organic matter cycling in marine and freshwater ecosystems.
K. Lenhart, F. Althoff, M. Greule, and F. Keppler
Biogeosciences, 12, 1907–1914, https://doi.org/10.5194/bg-12-1907-2015, https://doi.org/10.5194/bg-12-1907-2015, 2015
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Plants are known as a source of methane (CH4), but the biochemical mechanisms involved in CH4 formation are still unknown. Employing 13C-labelled methionine clearly identified the sulfur-bound methyl group of methionine as a carbon precursor of CH4 released from lavender plants. When relating CH4 emission rates to dark respiration of intact plants, we found a molar CH4:CO2 emission ratio of 2.0 ±1.1 (pmol:µmol). After physical stress CH4 release rates greatly increased.
A. Jugold, F. Althoff, M. Hurkuck, M. Greule, K. Lenhart, J. Lelieveld, and F. Keppler
Biogeosciences, 9, 5291–5301, https://doi.org/10.5194/bg-9-5291-2012, https://doi.org/10.5194/bg-9-5291-2012, 2012
Related subject area
Subject: Proxy Use-Development-Validation | Archive: Terrestrial Archives | Timescale: Instrumental Period
Cryogenic cave minerals recorded the 1889 CE melt event in northeastern Greenland
Ring-width and blue-light chronologies of Podocarpus lawrencei from southeastern mainland Australia reveal a regional climate signal
Seasonal climate signals preserved in biochemical varves: insights from novel high-resolution sediment scanning techniques
Modelling tree ring cellulose δ18O variations in two temperature-sensitive tree species from North and South America
Reconstructing paleoclimate fields using online data assimilation with a linear inverse model
Stable isotopes in caves over altitudinal gradients: fractionation behaviour and inferences for speleothem sensitivity to climate change
Anika Donner, Paul Töchterle, Christoph Spötl, Irka Hajdas, Xianglei Li, R. Lawrence Edwards, and Gina E. Moseley
Clim. Past, 19, 1607–1621, https://doi.org/10.5194/cp-19-1607-2023, https://doi.org/10.5194/cp-19-1607-2023, 2023
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This study investigates the first finding of fine-grained cryogenic cave minerals in Greenland, a type of speleothem that has been notably difficult to date. We present a successful approach for determining the age of these minerals using 230Th / U disequilibrium and 14C dating. We relate the formation of the cryogenic cave minerals to a well-documented extreme weather event in 1889 CE. Additionally, we provide a detailed report on the mineralogical and isotopic composition of these minerals.
Jacinda A. O'Connor, Benjamin J. Henley, Matthew T. Brookhouse, and Kathryn J. Allen
Clim. Past, 18, 2567–2581, https://doi.org/10.5194/cp-18-2567-2022, https://doi.org/10.5194/cp-18-2567-2022, 2022
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Tree-ring records provide a unique window into past climate variability. However, there are few such records from the Australian mainland. We present results from nine cross-sections of an alpine tree species from the Victorian Alps from 1929–1998. The tree-ring widths have significant correlations with winter temperature, precipitation and snow depth. The intensity of reflected blue light from the wood surface shows a strong response to growing season temperature and winter precipitation.
Paul D. Zander, Maurycy Żarczyński, Wojciech Tylmann, Shauna-kay Rainford, and Martin Grosjean
Clim. Past, 17, 2055–2071, https://doi.org/10.5194/cp-17-2055-2021, https://doi.org/10.5194/cp-17-2055-2021, 2021
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High-resolution geochemical imaging techniques provide new opportunities to investigate the biogeochemical composition of sediments at micrometer scale. Here, we compare biogeochemical data from biochemical varves with meteorological data to understand how seasonal meteorological variations are recorded in varve composition. We find that these scanning techniques help to clarify climate–proxy relationships in biochemical varves and show great potential for high-resolution climate reconstruction.
Aliénor Lavergne, Fabio Gennaretti, Camille Risi, Valérie Daux, Etienne Boucher, Martine M. Savard, Maud Naulier, Ricardo Villalba, Christian Bégin, and Joël Guiot
Clim. Past, 13, 1515–1526, https://doi.org/10.5194/cp-13-1515-2017, https://doi.org/10.5194/cp-13-1515-2017, 2017
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Tree rings are long-term recorders of past climate variations, but the origin of the climate signals imprinted is difficult to interpret. Here, using a complex model we show that the temperature signal recorded in tree rings from two species from North and South America is likely related to processes occurring at the leaf level. This result contributes to the quantitative interpretation of these proxies for their future exploitation for millennium-scale climate reconstructions.
Walter A. Perkins and Gregory J. Hakim
Clim. Past, 13, 421–436, https://doi.org/10.5194/cp-13-421-2017, https://doi.org/10.5194/cp-13-421-2017, 2017
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We examine the skill of a novel data assimilation approach to paleoclimate reconstruction that uses linear climate model forecasts. Many reconstruction studies forego the use of forecasts from climate models due to their high computational expense and relatively low skill. We show that the use of simpler linear models can improve reconstruction skill for both global mean temperature and spatial fields. Improvements displayed seem to be related to dynamical constraints from the forecasts.
V. E. Johnston, A. Borsato, C. Spötl, S. Frisia, and R. Miorandi
Clim. Past, 9, 99–118, https://doi.org/10.5194/cp-9-99-2013, https://doi.org/10.5194/cp-9-99-2013, 2013
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Short summary
We examined annually resolved stable carbon and hydrogen isotope ratios of wood lignin methoxy groups of beech trees growing in temperate, low elevation environments. Here, carbon isotope ratios reveal highest correlations with regional summer temperatures while hydrogen isotope ratios correlate more strongly with large-scale temperature changes. By combining the dual isotope ratios of wood lignin methoxy groups, a proxy for regional- to subcontinental-scale temperature patterns can be applied.
We examined annually resolved stable carbon and hydrogen isotope ratios of wood lignin methoxy...