Major increase in winter and spring precipitation during the Little Ice Age in the westerly dominated northern Qinghai-Tibetan Plateau
Zhao, JJ (Zhao, Jiaju)[ 1,2 ]; Thomas, EK (Thomas, Elizabeth K.)[ 3 ]; Yao, Y (Yao, Yuan)[ 1 ]; DeAraujo, J (DeAraujo, Jody)[ 2 ]; Huang, YS (Huang, Yongsong)[ 1,2 ]
2018-11-01
发表期刊QUATERNARY SCIENCE REVIEWS
卷号199页码:30-40
文章类型期刊论文
摘要

There have been numerous attempts to use long-chain alkenones (LCAs) in saline lakes for paleotemperature and paleosalinity reconstructions. However, LCAs in saline lakes are often produced by multiple haptophyte species, which may confound data interpretations. Here we analyzed LCAs in a finely laminated, high sedimentation rate core from the hypersaline Lake Gahai in the northern Qinghai-Tibetan Plateau and compared our results with regional instrumental records. We find that LCA unsaturation ratios display a stepwise jump during the instrumental period, most likely originating from a sudden shift in the dominant alkenone producers. In contrast, the percentage of the C37:4 alkenone (%C37:4) displays strong correlations with spring and combined winter-spring precipitation amount (R2 = 0.83 and R2 = 0.81, respectively). We hypothesize that high winter-spring precipitation leads to greater freshening of lake surface water immediately after spring melting, promoting greater production of LCAs with relatively high %C37:4 values by the early blooming haptophyte species. Extending the instrumental calibration downcore allows us to quantitatively reconstruct regional spring and winter-spring precipitation for the past millennium. We find a major increase in winter-spring precipitation during the Little Ice Age (LIA), especially during the phases of solar minima. Our finding provides novel quantitative support to the previous studies suggesting relatively wet conditions during the LIA in the westerly dominated regions of central Asia and northern Tibetan Plateau and infers a substantial increase in regional winter-spring precipitation should the predicted grand solar minimum in the forthcoming decades become a reality.

关键词Alkenone Precipitation Reconstructions Little Ice Age Qaidam Basin Lake Gahai
DOI10.1016/j.quascirev.2018.09.022
收录类别SCI
语种英语
引用统计
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/9582
专题黄土与第四纪地质国家重点实验室(2010~)
通讯作者Huang, YS (Huang, Yongsong)[ 1,2 ]
作者单位1.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China;
2.Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, RI02912, USA;
3.Department of Geology, University at Buffalo, New York, USA
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Zhao, JJ ,Thomas, EK ,Yao, Y ,et al. Major increase in winter and spring precipitation during the Little Ice Age in the westerly dominated northern Qinghai-Tibetan Plateau[J]. QUATERNARY SCIENCE REVIEWS,2018,199:30-40.
APA Zhao, JJ ,Thomas, EK ,Yao, Y ,DeAraujo, J ,&Huang, YS .(2018).Major increase in winter and spring precipitation during the Little Ice Age in the westerly dominated northern Qinghai-Tibetan Plateau.QUATERNARY SCIENCE REVIEWS,199,30-40.
MLA Zhao, JJ ,et al."Major increase in winter and spring precipitation during the Little Ice Age in the westerly dominated northern Qinghai-Tibetan Plateau".QUATERNARY SCIENCE REVIEWS 199(2018):30-40.
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