The monsoon variations at orbital timescale revealed by dolomite and stable carbon isotopic composition of loess from Xining(northeastern Qinghai-Tibetan Plateau)
Wang Susu, Lu Huayu, Wang Yao, Wang Xianyan, Zhang Xiaojian, Wang Xiaoyong
School of Geography and Ocean Science, Nanjing University, Nanjing 210023, Jiangsu
Abstract：East Asian summer monsoon(EASM) is an important component of Earth's climate system, which significantly influences the production and life of billion-plus populations over East Asia. East Asian monsoon variability and associated forcing mechanisms are the focus and frontier of Earth system science. Orbital timescale variability and forcing mechanisms of the EASM from paleoclimatic reconstructions still remain elusive. Previous studies revealed that precession-band variance is not the dominated frequency in loess records, while eccentricity-band is missing in high-resolution speleothem records. Whether loess deposit can record monsoon variability on a precession timescale largely depends on sedimentation rate and post-depositional processes that can attenuate the variability of the loess proxies. In this study, we chose the upper 60 m of the loess core located at Panzishan(PZS) (36.649°N, 101.844°E; 2728 m a.s.l.), Xining Basin in the northeastern Qinghai-Tibetan Plateau, where the dust sedimentation rate is high. A total of 272 samples were taken at an interval of 20 cm in this section. The depth-age model was constructed based on linear interpolations, and detail correlations between the grain size variations of the loess and the grain size time series of Luochuan. We present the grain size distribution, magnetic susceptibility, carbonate content, dolomite content and δ13C of carbonate of the loess-paleosol samples to reconstruct the EASM changes at Xining. The carbonate content and dolomite content are negatively related to rainfall. The δ13C of loess carbonate is related to soil respiration flux which was determined by the EASM intensity, therefore it is an ideal proxy of EASM in the northeastern Qinghai-Tibetan Plateau. Compared with magnetic susceptibility, carbonate content, dolomite content and δ13C can detect the same order of wet events during the last 280 ka. Our results show that these proxy records exhibit significant orbital timescale fluctuations, and linking the EASM with the high-latitude ice sheets in Northern Hemisphere and temperature. In addition, our spectral and wavelet transfers of the proxies time series detect a distinct 23 ka cycle, corresponding well with the precision cycle and frequency of speleothem δ18O. These results suggest that climate change in the northeastern Qinghai-Tibetan Plateau is not simply a response to high-latitude ice sheets and Northern Hemispaere temperature; low-latitude solar radiation changes driven by precession is also playing an important role in driving EASM precipitation changes in the northeastern Qinghai-Tibetan Plateau.
王素素, 鹿化煜, 王珧, 王先彦, 张肖剑, 王晓勇. 西宁黄土白云石和碳同位素记录的轨道尺度季风气候变化[J]. 第四纪研究, 2020, 40(6): 1453-1463.
Wang Susu, Lu Huayu, Wang Yao, Wang Xianyan, Zhang Xiaojian, Wang Xiaoyong. The monsoon variations at orbital timescale revealed by dolomite and stable carbon isotopic composition of loess from Xining(northeastern Qinghai-Tibetan Plateau). Quaternary Sciences, 2020, 40(6): 1453-1463.
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