Millennial-scale hydroclimate variations in southwest China linked to tropical Indian Ocean since the Last Glacial Maximum
Millennial-scale hydroclimate variations in southwest China linked to tropical Indian Ocean since the Last Glacial Maximum
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自末次盛冰期以来中国西南千年尺度的水文气候变化与热带印度洋有关
作者：
Zhang Enlou;Zhao Cheng;Xue Bin;Liu Zhonghui;Yu Zicheng;Chen Rong;Shen Ji
印度夏季风（ISM）的变化与轨道尺度的北方夏季日照和千年尺度的北大西洋气候有关。最近的研究表明，印度洋海表温度（SST）在影响冰消期千年尺度季风振荡中发挥着关键作用。然而，目前还不清楚SST是否会影响季风降雨和陆地水文气候在全新世。本文报道了中国西南地区末次盛冰期以来水文气候变化的多指标证据。与经常记录的全新世季风降雨逐渐减少叠加千年尺度的变化相似，我们的记录特别显示了明显的水文气候波动，包括5000-4000年前的潮湿条件，也许在过去的1000年。我们还发现我们的记录和海表盐度在印度洋东部的连贯变化，这表明陆地水文气候和由此产生的大陆排水影响了海洋表面的条件。这些波动可能与热带西印度洋季风源下游的SST变化有关，即，温暖的海洋和更多的季风降雨。我们的结论是，从末次冰消期到全新世，太阳辐射和热带海温对ISM的影响一直存在。
Indian summer monsoon (ISM) variations have been linked to the orbital-scale boreal summer insolation and millennial-scale North Atlantic climates. Recent studies show the critical role of Indian Ocean sea-surface temperatures (SSTs) in affecting deglacial millennial-scale monsoon oscillations. However, it is unclear whether SSTs can affect monsoon rainfall and terrestrial hydroclimate during the Holocene. Here we report multiproxy evidence of hydroclimate changes in southwest China since the Last Glacial Maximum. Similar to the often-documented gradual decrease in Holocene monsoon rainfall with superimposed millennial-scale variations, our records particularly show pronounced hydroclimate fluctuations including wet conditions at ∼5000-4000 yr ago, and perhaps over the past 1000 yr. We also find coherent variations between our records and sea-surface salinities in the eastern Indian Ocean, suggesting that terrestrial hydroclimate and resultant continental drainage have affected surface ocean conditions. These fluctuations are likely linked to changes in SSTs downstream of the monsoon source in the tropical western Indian Ocean, i.e., a warmer ocean and more monsoon rainfall. We conclude that the influence of both insolation and tropical SSTs on the ISM has persisted from the last deglaciation into Holocene.
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影响因子：
3
作者：
Cheng Zhao;Yuan‐Pin Chang;Min‐Te Chen;Zhonghui Liu
通讯作者：
Cheng Zhao;Yuan‐Pin Chang;Min‐Te Chen;Zhonghui Liu
影响因子：
3.1
作者：
J. Coakley;P. Chylek
通讯作者：
J. Coakley;P. Chylek
影响因子：
56.9
作者：
Fleitmann, D;Burns, SJ;Matter, A
通讯作者：
Matter, A
影响因子：
5.2
作者：
Jianling Yang;Qinyu Liu;S. Xie;Zhengyu Liu;Lixin Wu
通讯作者：
Jianling Yang;Qinyu Liu;S. Xie;Zhengyu Liu;Lixin Wu
影响因子：
18.3
作者：
Pausata, Francesco S. R.;Battisti, David S.;Bitz, Cecilia M.
通讯作者：
Bitz, Cecilia M.