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Hydroclimate in the Pamirs Was Driven by Changes in Precipitation-Evaporation Seasonality Since the Last Glacial Period
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för naturgeografi.
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Antal upphovsmän: 112019 (Engelska)Ingår i: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 46, nr 23, s. 13972-13983Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

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 as Lake Karakul, while annual precipitation amount and inflows remained fairly constant.

Ort, förlag, år, upplaga, sidor
2019. Vol. 46, nr 23, s. 13972-13983
Nyckelord [en]
climate, biomarker, geochemistry, modelling, paleoclimate, hydrology
Nationell ämneskategori
Geovetenskap och miljövetenskap
Identifikatorer
URN: urn:nbn:se:su:diva-177582DOI: 10.1029/2019GL085202ISI: 000500256900001OAI: oai:DiVA.org:su-177582DiVA, id: diva2:1386936
Tillgänglig från: 2020-01-20 Skapad: 2020-01-20 Senast uppdaterad: 2020-01-20Bibliografiskt granskad

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Av författaren/redaktören
Aichner, BernhardZhang, QiongPausata, Francesco S. R.Werner, MartinHeinecke, LivSachse, Dirk
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Institutionen för naturgeografi
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Geophysical Research Letters
Geovetenskap och miljövetenskap

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