Hydroclimate in the Pamirs Was Driven by Changes in Precipitation-Evaporation Seasonality Since theLast Glacial Period - Archive ouverte HAL Access content directly
Journal Articles Geophysical Research Letters Year : 2019

Hydroclimate in the Pamirs Was Driven by Changes in Precipitation-Evaporation Seasonality Since theLast Glacial Period

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Bernhard Aichner
  • Function : Author
Zafar Makhmudov
  • Function : Author
Iljomjon Rajabov
  • Function : Author
Qiong Zhang
Francesco S. R. Pausata
  • Function : Author
Martin Werner
Liv Heinecke
  • Function : Author
Sarah J. Feakins
  • Function : Author
Dirk Sachse
  • Function : Author
Steffen Mischke
  • Function : Author

Abstract

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. δD values of terrestrial biomarkers showed insolation-driven trends reflecting major shifts of water vapor sources. For aquatic biomarkers, positive δD 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.
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insu-03586590 , version 1 (24-02-2022)

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Bernhard Aichner, Zafar Makhmudov, Iljomjon Rajabov, Qiong Zhang, Francesco S. R. Pausata, et al.. Hydroclimate in the Pamirs Was Driven by Changes in Precipitation-Evaporation Seasonality Since theLast Glacial Period. Geophysical Research Letters, 2019, 46, pp.13,972-13,983. ⟨10.1029/2019GL085202⟩. ⟨insu-03586590⟩
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