Evidence for a warm-humid climate in arid northwestern China during 40–30 ka BP |
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| Authors: | Bao Yang Yafeng Shi Achim Braeuning Jianxun Wang |
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| Institution: | aKey Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, China;bCold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, China;cInstitute for Geography, University of Stuttgart, Germany;dYouyu Middle School, Shanxi Province, China |
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| Abstract: | Former shorelines and sedimentary records from several lake basins in northwestern China (Xinjiang, Qinghai) give evidence for warm and humid climatic conditions during 40–30 ka BP. Further indications of this favorable climate period are derived from palaeosols from the Ili loess and from cemented calcareous layers on the terraces of the Keriya River at the southern margin of the Tarim Basin and in the Badain Jaran Desert in Inner Mongolia. At that time, annual mean temperature in the Qaidam Basin was 2 °C higher and in the western part of Inner Mongolia even 2–3 °C higher than today. Precipitation in most parts of northwestern China was between 60–300 mm greater than today. These changes were probably a consequence of an increase in ocean surface temperature and evaporation resulting from a higher radiation input at middle and low latitudes caused by changes in the Earth's precessional cycle. As a result of these orbital changes, it is suggested that the intensified westerly circulation was responsible for increased moisture over northwestern China. |
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