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Summer moisture changes in the Lake Qinghai area on the northeastern Tibetan Plateau recorded from a meadow section over the past 8400yrs

Author:
Li, Xiangzhong, Liu, Xiangjun, He, Yuxin, Liu, Weiguo, Zhou, Xin, Wang, Zheng
Source:
Global and planetary change 2018 v.161 pp. 1-9
ISSN:
0921-8181
Subject:
Holocene epoch, climate, lacustrine sediments, lakes, meadows, monsoon season, organic carbon, plants (botany), soil color, stable isotopes, summer, temperature, uncertainty, water content, China
Abstract:
Holocene climatic and environmental changes on the northeastern Tibetan Plateau (TP) have been widely discussed based on the climatic records from sedimentary cores. However, differences in the reconstructed climatic history from various studies in this region still exist, probably due to influence of climatic proxies from multiple factors and the chronological uncertainties in lacustrine sediments. Here we present records of terrestrial plant δ¹³C, soil color and total organic carbon content over the past 8400years from a well-dated meadow section on the northeastern TP. The terrestrial plant δ¹³C value serves as a good summer precipitation/moisture indicator in the studied region. Soil color property and TOC content are also able to disentangle the moisture evolution history. All the data show much wet climates at 8400–7400calyr BP, dry climates at 7400–6000calyr BP and then wet conditions with fluctuation at 6000–3200calyr BP. Late Holocene moisture appears to be comparable with moist conditions from 6000 to 3200calyr BP. By further comparing the climatic variations in the Lake Qinghai area with records of the reconstructed summer temperature and the Asian Monsoon precipitation, we believe that the pattern of moisture/precipitation evolution in the Lake Qinghai area was not completely consistent with regions around Lake Qinghai, probably due to complicated interaction between the East Asian Summer Monsoon and the Indian Summer Monsoon.
Agid:
5936997