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Early Pleistocene climate in western arid central Asia inferred from loess-palaeosol sequences

Xin WangKey Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, ChinaHaitao WeiKey Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, ChinaMehdi TaheriDepartment of Soil Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan 49138-15739, IranFarhad KhormaliDepartment of Soil Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan 49138-15739, IranGuzel DanukalovaInstitute of Geology Ufimian scientific Centre, Russian Academy of Sciences, Ufa 450077, Russia; and Kazan Federal University, Kazan 420008, RussiaFahu ChenKey Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China

2016en

ABI

Annotatsiya

Arid central Asia (ACA) is one of the most arid regions in the mid-latitudes and one of the main potential dust sources for the northern hemisphere. The lack of in situ early Pleistocene loess/dust records from ACA hinders our comprehensive understanding of the spatio-temporal record of aeolian loess accumulation and long term climatic changes in Asia as a whole. Here, we report the results of sedimentological, chronological and climatic studies of early Pleistocene loess-palaeosol sequences (LPS) from the northeastern Iranian Golestan Province (NIGP) in the western part of ACA. Our results reveal that: 1) Accumulation of loess on the NIGP commenced at ~2.4-1.8 Ma, making it the oldest loess known so far in western ACA; 2) the climate during the early Pleistocene in the NIGP was semi-arid, but wetter, warmer, and less windy than during the late Pleistocene and present interglacial; 3) orbital-scale palaeoclimatic changes in ACA during the early Pleistoceneare in-phase with those of monsoonal Asia, a relationship which was probably related to the growth and decay of northern hemisphere ice sheets.

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DOI: 10.1038/srep20560

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