Bernhard Aichner, Zafar Makhmudov, Iljomjon Rajabov, Qiong Zhang, Francesco Salvatore R. Pausata, Martin Werner, Liv Heinecke, Marie L. Kuessner, Sarah J. Feakins, Dirk Sachse, Steffen Mischke
- The Central Asian Pamir Mountains (Pamirs) are a high-altitude region sensitive to climatic change, with only few paleoclimatic records available. To examine the glacial-interglacial hydrological changes in the region, we analyzed the geochemical parameters of a 31-kyr record from Lake Karakul and performed a set of experiments with climate models to interpret the results. delta D values of terrestrial biomarkers showed insolation-driven trends reflecting major shifts of water vapor sources. For aquatic biomarkers, positive delta D shifts driven by changes in precipitation seasonality were observed at ca. 31-30, 28-26, and 17-14 kyr BP. Multiproxy paleoecological data and modelling results suggest that increased water availability, induced by decreased summer evaporation, triggered higher lake levels during those episodes, possibly synchronous to northern hemispheric rapid climate events. We conclude that seasonal changes in precipitation-evaporation balance significantly influenced the hydrological state of a large waterbody such asThe Central Asian Pamir Mountains (Pamirs) are a high-altitude region sensitive to climatic change, with only few paleoclimatic records available. To examine the glacial-interglacial hydrological changes in the region, we analyzed the geochemical parameters of a 31-kyr record from Lake Karakul and performed a set of experiments with climate models to interpret the results. delta D values of terrestrial biomarkers showed insolation-driven trends reflecting major shifts of water vapor sources. For aquatic biomarkers, positive delta D shifts driven by changes in precipitation seasonality were observed at ca. 31-30, 28-26, and 17-14 kyr BP. Multiproxy paleoecological data and modelling results suggest that increased water availability, induced by decreased summer evaporation, triggered higher lake levels during those episodes, possibly synchronous to northern hemispheric rapid climate events. We conclude that seasonal changes in precipitation-evaporation balance significantly influenced the hydrological state of a large waterbody such as Lake Karakul, while annual precipitation amount and inflows remained fairly constant.…
MetadatenAuthor details: | Bernhard AichnerORCiDGND, Zafar Makhmudov, Iljomjon Rajabov, Qiong Zhang, Francesco Salvatore R. PausataORCiD, Martin WernerORCiD, Liv HeineckeORCiD, Marie L. Kuessner, Sarah J. Feakins, Dirk SachseORCiDGND, Steffen MischkeORCiDGND |
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DOI: | https://doi.org/10.1029/2019GL085202 |
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ISSN: | 0094-8276 |
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ISSN: | 1944-8007 |
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Title of parent work (English): | Geophysical research letters |
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Publisher: | American Geophysical Union |
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Place of publishing: | Washington |
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Publication type: | Article |
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Language: | English |
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Year of first publication: | 2019 |
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Publication year: | 2019 |
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Release date: | 2020/09/15 |
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Tag: | biomarker; climate; geochemistry; hydrology; modelling; paleoclimate |
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Volume: | 46 |
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Issue: | 23 |
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Number of pages: | 12 |
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First page: | 13972 |
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Last Page: | 13983 |
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Funding institution: | German Academic Exchange Service (DAAD)Deutscher Akademischer Austausch Dienst (DAAD); German Science Foundation (DFG)German Research Foundation (DFG) [Ai 134/2-1, Ai 134/2-2]; Swedish Research Council VRSwedish Research Council [2013-06476] |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geowissenschaften |
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DDC classification: | 5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften |
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Peer review: | Referiert |
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Publishing method: | Open Access |
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| Open Access / Hybrid Open-Access |
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