Central Asian modulation of Northern Hemisphere moisture transfer over the Late Cenozoic
Résumé
Abstract Earth’s climatic evolution over the last 5 million years is primarily understood from the perspective of marine mechanisms, however, the role of terrestrial feedbacks remains largely unexplored. Here we reconstruct the last 5 million years of soil moisture variability in Central Asia using paleomagnetism data and isotope geochemistry of an 80 m-thick sedimentary succession at Charyn Canyon, Kazakhstan. We identify a long-term trend of increasing aridification throughout the period, along with shorter-term variability related to the interaction between mid-latitude westerlies and the Siberian high-pressure system. This record highlights the long-term contribution of mid-latitude Eurasian terrestrial systems to the modulation of moisture transfer into the Northern Hemisphere oceans and back onto land via westerly air flow. The response of Earth-surface dynamics to Plio-Pleistocene climatic change in Central Asia likely generated terrestrial feedbacks affecting ocean and atmospheric circulation. This missing terrestrial link elucidates the significance of land-water feedbacks for long-term global climate.
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2021_Prud'homme_commsenv.pdf (2.59 Mo)
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Description of Additional Supplementary Files.pdf (42.94 Ko)
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Suppl_Data_1_Grain_Size.xlsx (25.03 Ko)
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Suppl_Data_2_MS.xlsx (37.56 Ko)
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Suppl_Data_3_Pmag_Table.xlsx (19.59 Ko)
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Suppl_Data_4_samples_rawdata_U_Pb.xlsx (85.04 Ko)
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Suppl_Data_5_data_report_U_Pb.xlsx (14.77 Ko)
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Suppl_Data_6_Stable_Isotope.xlsx (28.98 Ko)
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Suppl_Data_7_equilibrium_Gas.xlsx (16.99 Ko)
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