Articles | Volume 15, issue 5
https://doi.org/10.5194/cp-15-1757-2019
© Author(s) 2019. 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-15-1757-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Enhanced Mediterranean water cycle explains increased humidity during MIS 3 in North Africa
Mike Rogerson
CORRESPONDING AUTHOR
School of Environmental Sciences, University of Hull, Cottingham Road,
Hull, HU6 7RX, UK
Yuri Dublyansky
Institute of Geology, University of Innsbruck, Innrain 52, 6020
Innsbruck, Austria
Dirk L. Hoffmann
Department of Human Evolution, Max Planck Institute for Evolutionary
Anthropology, Deutscher Platz 6, 04103, Leipzig, Germany
Marc Luetscher
Institute of Geology, University of Innsbruck, Innrain 52, 6020
Innsbruck, Austria
Swiss Institute for Speleology and Karst Studies (ISSKA), Rue de la Serre 68,
2300 La Chaux-de-Fonds, Switzerland
Paul Töchterle
Institute of Geology, University of Innsbruck, Innrain 52, 6020
Innsbruck, Austria
Christoph Spötl
Institute of Geology, University of Innsbruck, Innrain 52, 6020
Innsbruck, Austria
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M. Rogerson, H. M. Pedley, A. Kelham, and J. D Wadhawan
Earth Surf. Dynam., 2, 197–216, https://doi.org/10.5194/esurf-2-197-2014, https://doi.org/10.5194/esurf-2-197-2014, 2014
Alexander H. Jarosch, Paul Hofer, and Christoph Spötl
The Cryosphere, 18, 4811–4816, https://doi.org/10.5194/tc-18-4811-2024, https://doi.org/10.5194/tc-18-4811-2024, 2024
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Mechanical damage to stalagmites is commonly observed in mid-latitude caves. In this study we investigate ice flow along the cave bed as a possible mechanism for stalagmite damage. Utilizing models which simulate forces created by ice flow, we study the structural integrity of different stalagmite geometries. Our results suggest that structural failure of stalagmites caused by ice flow is possible, albeit unlikely.
Amir Sedaghatkish, Frédéric Doumenc, Pierre-Yves Jeannin, and Marc Luetscher
The Cryosphere, 18, 4531–4546, https://doi.org/10.5194/tc-18-4531-2024, https://doi.org/10.5194/tc-18-4531-2024, 2024
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We developed a model to simulate the natural convection of water within frozen rock crevices subject to daily warming in mountain permafrost regions. Traditional models relying on conduction and latent heat flux typically overlook free convection. The results reveal that free convection can significantly accelerate the melting rate by an order of magnitude compared to conduction-based models. Our results are important for assessing the impact of climate change on mountain infrastructure.
Paul Töchterle, Anna Baldo, Julian B. Murton, Frederik Schenk, R. Lawrence Edwards, Gabriella Koltai, and Gina E. Moseley
Clim. Past, 20, 1521–1535, https://doi.org/10.5194/cp-20-1521-2024, https://doi.org/10.5194/cp-20-1521-2024, 2024
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We present a reconstruction of permafrost and snow cover on the British Isles for the Younger Dryas period, a time of extremely cold winters that happened approximately 12 000 years ago. Our results indicate that seasonal sea ice in the North Atlantic was most likely a crucial factor to explain the observed climate shifts during this time.
Stuart Umbo, Franziska Lechleitner, Thomas Opel, Sevasti Modestou, Tobias Braun, Anton Vaks, Gideon Henderson, Pete Scott, Alexander Osintzev, Alexandr Kononov, Irina Adrian, Yuri Dublyansky, Alena Giesche, and Sebastian Breitenbach
EGUsphere, https://doi.org/10.5194/egusphere-2024-1691, https://doi.org/10.5194/egusphere-2024-1691, 2024
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We use cave rocks to reconstruct northern Siberian climate 8.68 ± 0.09 million years ago. We show that when global average temperature was about 4.5 °C warmer than today (similar to what’s expected in the coming decades should carbon emissions continue unabated), Arctic temperature increased by more than 18 °C. Similar levels of Arctic warming in the future would see huge areas of permafrost (permanently frozen ground) thaw and release greenhouse gases to the atmosphere.
Miguel Bartolomé, Ana Moreno, Carlos Sancho, Isabel Cacho, Heather Stoll, Negar Haghipour, Ánchel Belmonte, Christoph Spötl, John Hellstrom, R. Lawrence Edwards, and Hai Cheng
Clim. Past, 20, 467–494, https://doi.org/10.5194/cp-20-467-2024, https://doi.org/10.5194/cp-20-467-2024, 2024
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Reconstructing past temperatures at regional scales during the Common Era is necessary to place the current warming in the context of natural climate variability. We present a climate reconstruction based on eight stalagmites from four caves in the Pyrenees, NE Spain. These stalagmites were dated precisely and analysed for their oxygen isotopes, which appear dominated by temperature changes. Solar variability and major volcanic eruptions are the two main drivers of observed climate variability.
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.
Charlotte Honiat, Gabriella Koltai, Yuri Dublyansky, R. Lawrence Edwards, Haiwei Zhang, Hai Cheng, and Christoph Spötl
Clim. Past, 19, 1177–1199, https://doi.org/10.5194/cp-19-1177-2023, https://doi.org/10.5194/cp-19-1177-2023, 2023
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A look at the climate evolution during the last warm period may allow us to test ground for future climate conditions. We quantified the temperature evolution during the Last Interglacial using a tiny amount of water trapped in the crystals of precisely dated stalagmites in caves from the southeastern European Alps. Our record indicates temperatures up to 2 °C warmer than today and an unstable climate during the first half of the Last Interglacial.
Miguel Bartolomé, Gérard Cazenave, Marc Luetscher, Christoph Spötl, Fernando Gázquez, Ánchel Belmonte, Alexandra V. Turchyn, Juan Ignacio López-Moreno, and Ana Moreno
The Cryosphere, 17, 477–497, https://doi.org/10.5194/tc-17-477-2023, https://doi.org/10.5194/tc-17-477-2023, 2023
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In this work we study the microclimate and the geomorphological features of Devaux ice cave in the Central Pyrenees. The research is based on cave monitoring, geomorphology, and geochemical analyses. We infer two different thermal regimes. The cave is impacted by flooding in late winter/early spring when the main outlets freeze, damming the water inside. Rock temperatures below 0°C and the absence of drip water indicate frozen rock, while relict ice formations record past damming events.
Paul Töchterle, Simon D. Steidle, R. Lawrence Edwards, Yuri Dublyansky, Christoph Spötl, Xianglei Li, John Gunn, and Gina E. Moseley
Geochronology, 4, 617–627, https://doi.org/10.5194/gchron-4-617-2022, https://doi.org/10.5194/gchron-4-617-2022, 2022
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Cryogenic cave carbonates (CCCs) provide a marker for past permafrost conditions. Their formation age is determined by Th / U dating. However, samples can be contaminated with small amounts of Th at formation, which can cause inaccurate ages and require correction. We analysed multiple CCCs and found that varying degrees of contamination can cause an apparent spread of ages, when samples actually formed within distinguishable freezing events. A correction method using isochrons is presented.
Maria Wind, Friedrich Obleitner, Tanguy Racine, and Christoph Spötl
The Cryosphere, 16, 3163–3179, https://doi.org/10.5194/tc-16-3163-2022, https://doi.org/10.5194/tc-16-3163-2022, 2022
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We present a thorough analysis of the thermal conditions of a sag-type ice cave in the Austrian Alps using temperature measurements for the period 2008–2021. Apart from a long-term increasing temperature trend in all parts of the cave, we find strong interannual and spatial variations as well as a characteristic seasonal pattern. Increasing temperatures further led to a drastic decrease in cave ice. A first attempt to model ablation based on temperature shows promising results.
Jan Pfeiffer, Thomas Zieher, Jan Schmieder, Thom Bogaard, Martin Rutzinger, and Christoph Spötl
Nat. Hazards Earth Syst. Sci., 22, 2219–2237, https://doi.org/10.5194/nhess-22-2219-2022, https://doi.org/10.5194/nhess-22-2219-2022, 2022
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The activity of slow-moving deep-seated landslides is commonly governed by pore pressure variations within the shear zone. Groundwater recharge as a consequence of precipitation therefore is a process regulating the activity of landslides. In this context, we present a highly automated geo-statistical approach to spatially assess groundwater recharge controlling the velocity of a deep-seated landslide in Tyrol, Austria.
Caroline Welte, Jens Fohlmeister, Melina Wertnik, Lukas Wacker, Bodo Hattendorf, Timothy I. Eglinton, and Christoph Spötl
Clim. Past, 17, 2165–2177, https://doi.org/10.5194/cp-17-2165-2021, https://doi.org/10.5194/cp-17-2165-2021, 2021
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Stalagmites are valuable climate archives, but unlike other proxies the use of stable carbon isotopes (δ13C) is still difficult. A stalagmite from the Austrian Alps was analyzed using a new laser ablation method for fast radiocarbon (14C) analysis. This allowed 14C and δ13C to be combined, showing that besides soil and bedrock a third source is contributing during periods of warm, wet climate: old organic matter.
Kathleen A. Wendt, Xianglei Li, R. Lawrence Edwards, Hai Cheng, and Christoph Spötl
Clim. Past, 17, 1443–1454, https://doi.org/10.5194/cp-17-1443-2021, https://doi.org/10.5194/cp-17-1443-2021, 2021
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In this study, we tested the upper limits of U–Th dating precision by analyzing three stalagmites from the Austrian Alps that have high U concentrations. The composite record spans the penultimate interglacial (MIS 7) with an average 2σ age uncertainty of 400 years. This unprecedented age control allows us to constrain the timing of temperature shifts in the Alps during MIS 7 while offering new insight into millennial-scale changes in the North Atlantic leading up to Terminations III and IIIa.
Gabriella Koltai, Christoph Spötl, Alexander H. Jarosch, and Hai Cheng
Clim. Past, 17, 775–789, https://doi.org/10.5194/cp-17-775-2021, https://doi.org/10.5194/cp-17-775-2021, 2021
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This paper utilises a novel palaeoclimate archive from caves, cryogenic cave carbonates, which allow for precisely constraining permafrost thawing events in the past. Our study provides new insights into the climate of the Younger Dryas (12 800 to 11 700 years BP) in mid-Europe from the perspective of a high-elevation cave sensitive to permafrost development. We quantify seasonal temperature and precipitation changes by using a heat conduction model.
Xianglei Li, Kathleen A. Wendt, Yuri Dublyansky, Gina E. Moseley, Christoph Spötl, and R. Lawrence Edwards
Geochronology, 3, 49–58, https://doi.org/10.5194/gchron-3-49-2021, https://doi.org/10.5194/gchron-3-49-2021, 2021
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In this study, we built a statistical model to determine the initial δ234U in submerged calcite crusts that coat the walls of Devils Hole 2 (DH2) cave (Nevada, USA) and, using a 234U–238U dating method, extended the chronology of the calcite deposition beyond previous well-established 230Th ages and determined the oldest calcite deposited in this cave, a time marker for cave genesis. The novel method presented here may be used in future speleothem studies in similar hydrogeological settings.
Haiwei Zhang, Hai Cheng, Yanjun Cai, Christoph Spötl, Ashish Sinha, Gayatri Kathayat, and Hanying Li
Clim. Past, 16, 211–225, https://doi.org/10.5194/cp-16-211-2020, https://doi.org/10.5194/cp-16-211-2020, 2020
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Few studies have paid attention to the important effect of nonsummer monsoon (NSM) precipitation on the speleothem δ18O in SE China. We find the summer monsoon precipitation is equivalent to NSM precipitation amount in the area of spring persistent rain in SE China, and we discuss the relationships between seasonal precipitation amount, moisture source, δ18O, and ENSO. Characterizing the spatial differences in seasonal precipitation is key to interpreting the speleothem δ18O record.
Gina E. Moseley, Christoph Spötl, Susanne Brandstätter, Tobias Erhardt, Marc Luetscher, and R. Lawrence Edwards
Clim. Past, 16, 29–50, https://doi.org/10.5194/cp-16-29-2020, https://doi.org/10.5194/cp-16-29-2020, 2020
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Abrupt climate change during the last ice age can be used to provide important insights into the timescales on which the climate is capable of changing and the mechanisms that drive those changes. In this study, we construct climate records for the period 60 to 120 ka using stalagmites that formed in caves along the northern rim of the European Alps and find good agreement with the timing of climate changes in Greenland and the Asian monsoon.
Hanying Li, Hai Cheng, Ashish Sinha, Gayatri Kathayat, Christoph Spötl, Aurèle Anquetil André, Arnaud Meunier, Jayant Biswas, Pengzhen Duan, Youfeng Ning, and Richard Lawrence Edwards
Clim. Past, 14, 1881–1891, https://doi.org/10.5194/cp-14-1881-2018, https://doi.org/10.5194/cp-14-1881-2018, 2018
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The
4.2 ka eventbetween 4.2 and 3.9 ka has been widely discussed in the Northern Hemsiphere but less reported in the Southern Hemisphere. Here, we use speleothem records from Rodrigues in the southwestern Indian Ocean spanning from 6000 to 3000 years ago to investigate the regional hydro-climatic variability. Our records show no evidence for an unusual climate anomaly between 4.2 and 3.9 ka. Instead, it shows a multi-centennial drought between 3.9 and 3.5 ka.
Haiwei Zhang, Hai Cheng, Yanjun Cai, Christoph Spötl, Gayatri Kathayat, Ashish Sinha, R. Lawrence Edwards, and Liangcheng Tan
Clim. Past, 14, 1805–1817, https://doi.org/10.5194/cp-14-1805-2018, https://doi.org/10.5194/cp-14-1805-2018, 2018
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The collapses of several Neolithic cultures in China are considered to have been associated with abrupt climate change during the 4.2 ka BP event; however, the hydroclimate of this event in China is still poorly known. Based on stalagmite records from monsoonal China, we found that north China was dry but south China was wet during this event. We propose that the rain belt remained longer at its southern position, giving rise to a pronounced humidity gradient between north and south China.
Arno Hartmann, Marc Luetscher, Ralf Wachter, Philipp Holz, Elisabeth Eiche, and Thomas Neumann
Hydrol. Earth Syst. Sci., 22, 4281–4293, https://doi.org/10.5194/hess-22-4281-2018, https://doi.org/10.5194/hess-22-4281-2018, 2018
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We have developed a new mobile automated water sampling device for environmental research and other applications where waters need to be tested for compliance with environmental/health regulations. It has two main advantages over similar devices: firstly, it injects water samples directly into airtight vials to prevent any change in sample properties through contamination, evaporation and gas exchange. Secondly, it can hold up to 160 sample vials, while other devices only hold up to 24 vials.
Gabriella Koltai, Hai Cheng, and Christoph Spötl
Clim. Past, 14, 369–381, https://doi.org/10.5194/cp-14-369-2018, https://doi.org/10.5194/cp-14-369-2018, 2018
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Here we present a multi-proxy study of flowstones in fractures of crystalline rocks with the aim of assessing the palaeoclimate significance of this new type of speleothem archive. Our results indicate a high degree of spatial heterogeneity, whereby changes in speleothem mineralogy and carbon isotope composition are likely governed by aquifer-internal processes. In contrast, the oxygen isotope composition reflects first-order climate variability.
C. Spötl and H. Cheng
Clim. Past, 10, 1349–1362, https://doi.org/10.5194/cp-10-1349-2014, https://doi.org/10.5194/cp-10-1349-2014, 2014
M. Rogerson, H. M. Pedley, A. Kelham, and J. D Wadhawan
Earth Surf. Dynam., 2, 197–216, https://doi.org/10.5194/esurf-2-197-2014, https://doi.org/10.5194/esurf-2-197-2014, 2014
M. Luetscher, M. Borreguero, G. E. Moseley, C. Spötl, and R. L. Edwards
The Cryosphere, 7, 1073–1081, https://doi.org/10.5194/tc-7-1073-2013, https://doi.org/10.5194/tc-7-1073-2013, 2013
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
Related subject area
Subject: Continental Surface Processes | Archive: Terrestrial Archives | Timescale: Milankovitch
A tropical speleothem record of glacial inception, the South American Summer Monsoon from 125 to 115 ka
Mass movement deposits in the 3.6 Ma sediment record of Lake El'gygytgyn, Far East Russian Arctic
Asian aridification linked to the first step of the Eocene-Oligocene climate Transition (EOT) in obliquity-dominated terrestrial records (Xining Basin, China)
S. J. Burns, L. C. Kanner, H. Cheng, and R. Lawrence Edwards
Clim. Past, 11, 931–938, https://doi.org/10.5194/cp-11-931-2015, https://doi.org/10.5194/cp-11-931-2015, 2015
M. A. Sauerbrey, O. Juschus, A. C. Gebhardt, V. Wennrich, N. R. Nowaczyk, and M. Melles
Clim. Past, 9, 1949–1967, https://doi.org/10.5194/cp-9-1949-2013, https://doi.org/10.5194/cp-9-1949-2013, 2013
G. Q. Xiao, H. A. Abels, Z. Q. Yao, G. Dupont-Nivet, and F. J. Hilgen
Clim. Past, 6, 501–513, https://doi.org/10.5194/cp-6-501-2010, https://doi.org/10.5194/cp-6-501-2010, 2010
Cited articles
Adkins, J., Demenocal, P., and Eshel, G.: The “African humid period” and
the record of marine upwelling from excess 230Th in Ocean Drilling Program
Hole 658C, Paleoceanography and Paleoclimatology, 21, PA4203, https://doi.org/10.1029/2005PA001200, 2006.
Aggarwal, P. K., Romatschke, U., Araguas-Araguas, L., Belachew, D.,
Longstaffe, F. J., Berg, P., Schumacher, C., and Funk, A.: Proportions of
convective and stratiform precipitation revealed in water isotope ratios,
Nat. Geosci., 9, 624–629, 2016.
Ait Brahim, Y., Cheng, H., Sifeddine, A., Wassenburg, J. A., Cruz, F. W.,
Khodri, M., Sha, L., Pérez-Zanón, N., Beraaouz, E. H.,
Apaéstegui, J., Guyot, J.-L., Jochum, K. P., and Bouchaou, L.:
Speleothem records decadal to multidecadal hydroclimate variations in
southwestern Morocco during the last millennium, Earth Planet. Sc. Lett., 476, 10010, https://doi.org/10.1016/j.epsl.2017.07.045,
2017.
Arienzo, M. M., Swart, P. K., Pourmand, A., Broad, K., Clement, A. C.,
Murphy, L. N., Vonhof, H. B., and Kakuk, B.: Bahamian speleothem reveals
temperature decrease associated with Heinrich stadials, Earth Planet. Sc. Lett., 430, 377–386, 2015.
Armitage, S. J., Drake, N. A., Stokes, S., El-Hawat, A., Salem, M., White,
K., Turner, P., and McLaren, S. J.: Multiple phases of north African
humidity recorded in lacustrine sediments from the fazzan basin, Libyan
sahara, Quat. Geochronol., 2, 181–186, 2007.
Ayalon, A., Bar-Matthews, M., and Sass, E.: Rainfall-recharge relationships
within a karstic terrain in the Eastern Mediterranean semi-arid region,
Israel: δ18O and δD characteristics, J. Hydrol.,
207, 18–31, 10.1016/S0022-1694(98)00119-X, 1998.
Baker, A., Ito, E., Smart, P. L., and McEwan, R. F.: Elevated and variable
values of 13C in speleothems in a British cave system, Chem. Geol.,
136, 263–270, 1997.
Ballais, J.-L.: Evolution holocène de la Tunisie saharienne et
présaharienne, Méditerranée, 74, 31–38, 1991.
Bethoux, J. P. and Gentili, B.: Functioning of the Mediterranean Sea: past
and present changes related to freshwater input and climate changes, J.
Marine Syst., 20, 33–47, 1999.
Black, E., Brayshaw, D. J., and Rambeau, C. M. C.: Past, present and future
precipitation in the Middle East: Insights from models and observations,
Philos. T. R. Soc. A, 368, 5173–5184, https://doi.org/10.1098/rsta.2010.0199, 2010.
Bosmans, J. H. C., Drijfhout, S. S., Tuenter, E., Hilgen, F. J., Lourens, L.
J., and Rohling, E. J.: Precession and obliquity forcing of the freshwater
budget over the Mediterranean, Quaternary Sci. Rev., 123, 16–30,
https://doi.org/10.1016/j.quascirev.2015.06.008, 2015.
Brayshaw, D. J., Woollings, T., and Vellinga, M.: Tropical and Extratropical
Responses of the North Atlantic Atmospheric Circulation to a Sustained
Weakening of the MOC, J. Climate, 22, 3146–3155,
https://doi.org/10.1175/2008jcli2594.1, 2009.
Brun, A.: Reflections on the pluvial and arid periods of the Upper
Pleistocene and of the Holocene in Tunisia, Palaeoecology of Africa and the
surrounding islands, Vol. 22, Proc. symposium on African palynology, Rabat, Morocco,
15–21 May 1989, 157–170, 1991.
Cancellieri, E., Cremaschi, M., Zerboni, A., and di Lernia, S.: Climate,
Environment, and Population Dynamics in Pleistocene Sahara, in: Africa from
MIS 6-2, Vertebrate Paleobiology and Paleoanthropology, edited by: Jones, S. C. and Stewart, B. A., Springer, Dordrecht, the Netherlands, 2016.
Celle-Jeanton, H., Zouari, K., Travi, Y., and Daoud, A.: Caractérisation
isotopique des pluies en Tunisie. Essai de typologie dans la région de
Sfax, Sciences de la Terre et des planètes, 333, 625–631, 2001.
Charlier, B., Ginibre, C., Morgan, D., Nowell, G., Pearson, D., Davidson,
J., and Ottley, C.: Methods for the microsampling and high-precision
analysis of strontium and rubidium isotopes at single crystal scale for
petrological and geochronological applications, Chem. Geol., 232,
114–133, 2006.
Collins, J. A., Govin, A., Mulitza, S., Heslop, D., Zabel, M., Hartmann, J., Röhl, U., and Wefer, G.: Abrupt shifts of the Sahara–Sahel boundary during Heinrich stadials, Clim. Past, 9, 1181–1191, https://doi.org/10.5194/cp-9-1181-2013, 2013.
Collins, J. A., Prange, M., Caley, T., Gimeno, L., Beckmann, B., Mulitza,
S., Skonieczny, C., Roche, D., and Schefuß, E.: Rapid termination of the
African humid period triggered by northern high-latitude cooling, Nat.
Commun., 8, 1372, https://doi.org/10.1038/s41467-017-01454-y, 2017.
Dayan, U., Nissen, K., and Ulbrich, U.: Review Article: Atmospheric conditions inducing extreme precipitation over the eastern and western Mediterranean, Nat. Hazards Earth Syst. Sci., 15, 2525–2544, https://doi.org/10.5194/nhess-15-2525-2015, 2015.
deMenocal, P., Ortiz, J., Guilderson, T., Adkins, J., Sarnthein, M., Baker,
L., and Yarusinsky, M.: Abrupt onset and termination of the African Humid
Period: rapid climate responses to gradual insolation forcing, Quaternary
Sci. Rev., 19, 347–361, 2000.
Drake, N. A., El-Hawat, A. S., Turner, P., Armitage, S. J., Salem, M. J.,
White, K. H., and McLaren, S.: Palaeohydrology of the Fazzan Basin and
surrounding regions: The last 7 million years, Palaeogeogr.
Palaeocl., 263, 131–145, https://doi.org/10.1016/j.palaeo.2008.02.005,
2008.
Drake, N. A., Blench, R. M., Armitage, S. J., Bristow, C. S., and White, K.
H.: Ancient watercourses and biogeography of the Sahara explain the peopling
of the desert, P. Natl. Acad. Sci. USA, 108, 458–462,
https://doi.org/10.1073/pnas.1012231108, 2011.
Dublyansky, Y. V. and Spötl, C.: Hydrogen and oxygen isotopes of water
from inclusions in minerals: Design of a new crushing system and on-line
continous-flow isotope ratio mass spectrometric analysis, Rapid
Commun. Mass Sp., 23, 2605–2613, https://doi.org/10.1002/rcm.4155, 2009.
Fleitmann, D., Burns, S. J., Neff, U., Mangini, A., and Matter, A.: Changing
moisture sources over the last 330 000 years in Northern Oman from
fluid-inclusion evidence in speleothems, Quaternary Res., 60, 223–232,
https://doi.org/10.1016/S0033-5894(03)00086-3, 2003.
Fontes, J. C. and Gasse, F.: PALHYDAF (Palaeohydrology in Africa) program:
objectives, methods, major results, Palaeogeogr. Palaeocl., 84, 191–215, https://doi.org/10.1016/0031-0182(91)90044-R, 1991.
Frumkin, A. and Stein, M.: The Sahara-East Mediterranean dust and climate
connection revealed by strontium and uranium isotopes in a Jerusalem
speleothem, Earth Planet. Sc. Lett., 217, 451–464,
https://doi.org/10.1016/s0012-821x(03)00589-2, 2004.
Gasse, F. and Campo, E. V.: Abrupt post-glacial climate events in west Asia
and north Africa monsoon domains, Earth Planet. Sc. Lett., 126,
435–456, 1994.
Gasse, F.: Diatom-inferred salinity and carbonate oxygen isotopes in
Holocene waterbodies of the western Sahara and Sahel (Africa), Quaternary
Sci. Rev., 21, 737–767, 2002.
Gat, J. R., Klein, B., Kushnir, Y., Roether, W., Wernli, H., Yam, R., and
Shemesh, A.: Isotope composition of air moisture over the Mediterranean Sea:
An index of the air-sea interaction pattern, Tellus B, 55, 953–965, https://doi.org/10.1034/j.1600-0889.2003.00081.x, 2003.
Genty, D., Blamart, D., Ghaleb, B., Plagnes, V., Causse, C., Bakalowicz, M.,
Zouari, K., Chkir, N., Hellstrom, J., Wainer, K., and Bourges, F.: Timing
and dynamics of the last deglaciation from European and North African
δ13C stalagmite profiles-comparison with Chinese and South
Hemisphere stalagmites, Quaternary Sci. Rev., 25, 2118–2142, 2006.
Goldsmith, Y., Polissar, P. J., Ayalon, A., Bar-Matthews, M., deMenocal, P.
B., and Broecker, W. S.: The modern and Last Glacial Maximum hydrological
cycles of the Eastern Mediterranean and the Levant from a water isotope
perspective, Earth Planet. Sc. Lett., 457, 302–312, https://doi.org/10.1016/j.epsl.2016.10.017, 2017.
Grant, K. M., Grimm, R., Mikolajewicz, U., Marino, G., Ziegler, M., and
Rohling, E. J.: The timing of Mediterranean sapropel deposition relative to
insolation, sea-level and African monsoon changes, Quaternary Sci. Rev., 140, 125–141, https://doi.org/10.1016/j.quascirev.2016.03.026, 2016.
Harrison, S., Bartlein, P., Izumi, K., Li, G., Annan, J., Hargreaves, J.,
Braconnot, P., and Kageyama, M.: Evaluation of CMIP5 palaeo-simulations to
improve climate projections, Nat. Clim. Change, 5, 735–743, 2015.
Hoffmann, D. L., Rogerson, M., Spötl, C., Luetscher, M., Vance, D.,
Osborne, A. H., Fello, N. M., and Moseley, G. E.: Timing and causes of North
African wet phases during MIS 3 and implications for Modern Human migration,
Nat. Sci. Rep., 6, 36367, https://doi.org/10.1038/srep36367, 2016.
IPCC: Climate Change 2014: Impacts, Adaptation, and Vulnerability. Part B:
Regional Aspects, Contribution of Working Group II to the Fifth Assessment
Report of the Intergovernmental Panel on Climate Change, UK and
New York, USA, 688 pp., 2014.
Jolly, D., Prentice, I. C., Bonnefille, R., Ballouche, A., Bengo, M.,
Brenac, P., Buchet, G., Burney, D., Cazet, J. P., Cheddadi, R., Edorh, T.,
Elenga, H., Elmoutaki, S., Guiot, J., Laarif, F., Lamb, H., Lezine, A. M.,
Maley, J., Mbenza, M., Peyron, O., Reille, M., Reynaud-Farrera, I., Riollet,
G., Ritchie, J. C., Roche, E., Scott, L., Ssemmanda, I., Straka, H., Umer,
M., Van Campo, E., Vilimumbalo, S., Vincens, A., and Waller, M.: Biome
reconstruction from pollen and plant macrofossil data for Africa and the
Arabian peninsula at 0 and 6000 years, J. Biogeogr., 25,
1007–1027, 1998.
Langgut, D., Almogi-Labin, A., Bar-Matthews, M., Pickarski, N., and
Weinstein-Evron, M.: Evidence for a humid interval at ∼56–44 ka in the Levant and its potential link to modern humans dispersal out of
Africa, J. Hum. Evol., 124, 75–90,
https://doi.org/10.1016/j.jhevol.2018.08.002, 2018.
McGarry, S., Bar-Matthews, M., Matthews, A., Vaks, A., Schilman, B., and
Ayalon, A.: Constraints on hydrological and paleotemperature variations in
the Eastern Mediterranean region in the last 140 ka given by the δD
values of speleothem fluid inclusions, Quaternary Sci. Rev., 23,
919–934, https://doi.org/10.1016/j.quascirev.2003.06.020,
2004.
Meckler, A. N., Affolter, S., Dublyansky, Y. V., Krüger, Y., Vogel, N.,
Bernasconi, S. M., Frenz, M., Kipfer, R., Leuenberger, M., Spötl, C.,
Carolin, S., Cobb, K. M., Moerman, J., Adkins, J. F., and Fleitmann, D.:
Glacial–interglacial temperature change in the tropical West Pacific:
A comparison of stalagmite-based paleo-thermometers, Quaternary Sci. Rev., 127, 90–116, https://doi.org/10.1016/j.quascirev.2015.06.015, 2015.
Nicoll, K.: A revised chronology for Pleistocene paleolakes and Middle Stone
Age – Middle Paleolithic cultural activity at Bîr Tirfawi – Bîr
Sahara in the Egyptian Sahara, Quatern. Int., 463, 18–28,
https://doi.org/10.1016/j.quaint.2016.08.037, 2018.
Osborne, A., Vance, D., Rohling, E., Barton, N., Rogerson, M., and Fello,
N.: A humid corridor across the Sahara for the migration of early modern
humans out of Africa 120 000 years ago, P. Natl. Acad. Sci. USA,
https://doi.org/10.1073/pnas.0804472105, 2008.
Osborne, A. H., Marino, G., Vance, D., and Rohling, E. J.: Eastern
Mediterranean surface water Nd during Eemian sapropel S5: monitoring
northerly (mid-latitude) versus southerly (sub-tropical) freshwater
contributions, Quaternary Sci. Rev., 29, 2473–2483, https://doi.org/10.1016/j.quascirev.2010.05.015, 2010.
Pascale, S., Gregory, J. M., Ambaum, M., and Tailleux, R.: Climate entropy
budget of the HadCM3 atmosphere-ocean general circulation model and of
FAMOUS, its low-resolution version, Clim. Dynam., 36, 1189–1206,
https://doi.org/10.1007/s00382-009-0718-1, 2011.
Peleg, N. and Morin, E.: Convective rain cells: Radar-derived
spatiotemporal characteristics and synoptic patterns over the eastern
Mediterranean, J. Geophys. Res.-Atmos., 117, D15116, https://doi.org/10.1029/2011JD017353, 2012.
Petit-Maire, N., Burollet, P. F., Ballais, J.-L., Fontugne, M., Rosso,
J.-C., Lazaar, A., and Gauthier-Villars, I.: Paléoclimats
holocènes du Sahara septentrional, Dépôts lacustres et terrasses
alluviales en bordure du Grand Erg Oriental à l'extrême-Sud de la
Tunisie, Comptes rendus de l'Académie des sciences, Série 2,
Mécanique, Physique, Chimie, Sciences de l'univers, Sciences de la Terre,
312, 1661–1666, 1991.
Peyron, O., Jolly, D., Braconnot, P., Bonnefille, R., Guiot, J., Wirrmann,
D., and Chalie, F.: Quantitative reconstructions of annual rainfall in
Africa 6000 years ago: Model-data comparison, J. Geophys.
Res.-Atmos., 111, D24110, https://doi.org/10.1029/2006JD007396, 2006.
Prentice, I. C. and Jolly, D.: Mid-Holocene and glacial-maximum vegetation
geography of the northern continents and Africa, J. Biogeogr.,
27, 507–519, 2000.
Revel, M., Ducassou, E., Grousset, F. E., Bernasconi, S. M., Migeon, S.,
Revillon, S., Mascle, J., Murat, A., Zaragosi, S., and Bosch, D.: 100 000
Years of African monsoon variability recorded in sediments of the Nile
margin, Quaternary Sci. Rev., 29, 1342–1362,
https://doi.org/10.1016/j.quascirev.2010.02.006, 2010.
Rogerson, M., Schönfeld, J., and Leng, M.: Qualitative and quantitative
approaches in palaeohydrography: A case study from core-top parameters in
the Gulf of Cadiz, Mar. Geol., 280, 150–167, 2011.
Rogerson, M., Rohling, E. J., Bigg, G. R., and Ramirez, J.:
Palaeoceanography of the Atlantic-Mediterranean Exchange: Overview and first
quantitative assessment of climatic forcing, Rev. Geophys., 50, RG2003, https://doi.org/10.1029/2011RG000376, 2012.
Rogerson, M., Dublyansky, Y., Hoffmann, D. L., Luetscher, M., Töchterle, P., and Spötl, C.: Fluid inclusion oxygen and hydrogen stable isotopes in a speleothem from Susah Cave, Libya, PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.904801, last access: 14 August 2019.
Rohling, E., Marino, G., and Grant, K.: Mediterranean climate and
oceanography, and the periodic development of anoxic events (sapropels),
Earth-Sci. Rev., 143, 62–97, 2015.
Rohling, E. J. and Bryden, H. L.: Estimating past changes in the Eastern
Mediterranean freshwater budget, using reconstructions of sea level and
hydrography, Proceedings Koninklijke Nederlandse Akademie van Wetenschappen,
Serie B, 97, 201–217, 1994.
Rowan, J. S., Black, S., Macklin, M. G., Tabner, B. J., and Dore, J.:
Quaternary environmental change in Cyrenaica evidenced by U-Th, ESR and OSL
of coastal alluvial fan sequences, Libyan Studies, 31, 5–16, 2000.
Schwarcz, H. P., Harmon, R. S., Thompson, P., and Ford, D. C.: Stable
isotope studies of fluid inclusions in speleothems and their paleoclimatic
significance, Geochim. Cosmochim. Ac., 40, 657–665, https://doi.org/10.1016/0016-7037(76)90111-3, 1976.
Smith, J. R., Giegengack, R., Schwarcz, H. P., McDonald, M. M. A.,
Kleindienst, M. R., Hawkins, A. L., and Churcher, C. S.: A reconstruction of
quaternary pluvial environments and human occupations using stratigraphy and
geochronology of fossil-spring tufas, Kharga Oasis, Egypt, Geoarchaeology, 19, 407–439, 2004.
Smith, J. R., Hawkins, A. L., Asmerom, Y., Polyak, V., and Giegengack, R.:
New age constraints on the Middle Stone Age occupations of Kharga Oasis,
Western Desert, Egypt, J. Hum. Evol., 52, 690–701, 2007.
Swezey, C.: Eolian sediment responses to late Quaternary climate changes:
temporal and spatial patterns in the Sahara, Palaeogeogr.
Palaeocl., 167, 119–155, 2001.
Toucanne, S., Angue Minto'o, C. M., Fontanier, C., Bassetti, M.-A., Jorry,
S. J., and Jouet, G.: Tracking rainfall in the northern Mediterranean
borderlands during sapropel deposition, Quaternary Sci. Rev., 129,
178–195, https://doi.org/10.1016/j.quascirev.2015.10.016,
2015.
Tuenter, E., Weber, S. L., Hilgen, F. J., and Lourens, L. J.: The response
of the African summer monsoon to remote and local forcing due to precession
and obliquity, Global Planet. Change, 36, 219–235, 2003.
Vaks, A., Woodhead, J., Bar-Matthews, M., Ayalon, A., Cliff, R., Zilberman,
T., Matthews, A., and Frumkin, A.: Pliocene–Pleistocene climate of the
northern margin of Saharan–Arabian Desert recorded in speleothems from the
Negev Desert, Israel, Earth Planet. Sc. Lett., 368, 88–100,
2013.
Van Breukelen, M., Vonhof, H., Hellstrom, J., Wester, W., and Kroon, D.:
Fossil dripwater in stalagmites reveals Holocene temperature and rainfall
variation in Amazonia, Earth Planet. Sc. Lett., 275, 54–60,
2008.
Wainer, K., Genty, D., Blamart, D., Daëron, M., Bar-Matthews, M.,
Vonhof, H., Dublyansky, Y., Pons-Branchu, E., Thomas, L., van Calsteren, P.,
Quinif, Y., and Caillon, N.: Speleothem record of the last 180 ka in Villars
cave (SW France): Investigation of a large δ18O shift between MIS6
and MIS5, Quaternary Sci. Rev., 30, 130–146, https://doi.org/10.1016/j.quascirev.2010.07.004, 2011.
Wassenburg, J. A., Immenhauser, A., Richter, D. K., Niedermayr, A.,
Riechelmann, S., Fietzke, J., Scholz, D., Jochum, K. P., Fohlmeister, J.,
Schröder-Ritzrau, A., Sabaoui, A., Riechelmann, D. F. C., Schneider, L.,
and Esper, J.: Moroccan speleothem and tree ring records suggest a variable
positive state of the North Atlantic Oscillation during the Medieval Warm
Period, Earth Planet. Sc. Lett., 375, 291–302, https://doi.org/10.1016/j.epsl.2013.05.048, 2013.
Wassenburg, J. A., Dietrich, S., Fietzke, J., Fohlmeister, J., Jochum, K.
P., Scholz, D., Richter, D. K., Sabaoui, A., Spötl, C., Lohmann, G.,
Andreae, M. O., and Immenhauser, A.: Reorganization of the North
Atlantic Oscillation during early Holocene deglaciation, Nat. Geosci., 9,
602–605, https://doi.org/10.1038/ngeo2767,
2016.
Short summary
Rainfall in North Africa is known to vary through time and is likely to change as global climate warms. Here, we provide a new level of understanding about past rainfall in North Africa by looking at a stalagmite which formed within northeastern Libya between 67 and 30 thousand years ago. We find that at times more rain falls, and the associated moisture is mostly derived from the western Mediterranean during winter storms. Sometimes, water comes from the eastern Mediterranean.
Rainfall in North Africa is known to vary through time and is likely to change as global climate...