A detailed East Asian monsoon history of Greenland Interstadial 21 in southeastern China

A detailed East Asian monsoon history of Greenland Interstadial 21 in southeastern China
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中国东南部格陵兰Interstadial 21详细的东亚季风历史

DOI:
10.1016/j.palaeo.2020.109752
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发表时间:
2020-08
期刊:
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子:
--
通讯作者:
Jiang Xiuyang
Jiang Xiuyang
中科院分区:
其他
文献类型:
--
作者:
Zhang Xin;Xiao Haiyan;Chou Yu-Chen;Cai Binggui;Lone Mahjoor Ahmad;Shen Chuan-Chou;Jiang Xiuyang

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格陵兰Interstadial-21(GIS 21)是一次百年尺度的前兆事件和一次“反弹型”事件,是上个冰河期格陵兰冰芯记录的最长的温暖千年尺度事件之一。精确确定其时间和持续时间可以提高我们对海洋同位素阶段 (MIS) 5b/5a 和 5a/4 区域/全球气候相关性的理解。这里,利用来自中国东南部福建省仙云洞的精确的230年代年代际解析石笋δ18O记录来重建东亚夏季风(EASM)从87.6到76.3 kyr BP(公元1950年之前)的亚千年尺度变化,涵盖了中国的Interstadial 21(CIS 21)事件。 GIS 21期间空间分离的中国洞穴生物记录的比较表明,从中国东南部到中国西北部,洞穴生物δ18O值逐渐减少。这些δ18O空间梯度可归因于“降雨效应”和降水δ18O季节变化的放大机制。此外,先云δ18O记录捕获了以85.3 ± 0.3 kyr BP为中心的前兆事件,与冰芯中的相应事件同时发生,揭示了高纬度和低纬度之间的大气遥相关。与 GIS 21 中期格陵兰岛和南极冰芯记录的逐渐变冷不同,仙云记录显示出相对较强的季风阶段。我们推测,南半球(SH)变冷可能通过加强越赤道气流来影响东亚夏季风活动,削弱北半球(NH)高纬度气候的影响,从而指出南半球气候对东亚夏季风在千年尺度上的作用。
Greenland Interstadial-21 (GIS 21), with a centennial-scale precursor event and a “rebound-type” event, was one of the longest warm millennial-scale events recorded in Greenland ice cores during the last glacial period. Precise determination of its timing and duration can improve our understanding of regional/global climate correlations over Marine Isotope Stages (MIS) 5b/5a and 5a/4. Here, a precisely230Th-dated decadally-resolved stalagmite δ18O record from Xianyun Cave, Fujian Province, southeastern China, is utilized to reconstruct the sub-millennial-scale changes in East Asian summer monsoon (EASM) from 87.6 to 76.3 kyr BP (before 1950 CE), covering Chinese Interstadial 21 (CIS 21) event. A comparison of spatially-separated Chinese speleothem records during GIS 21 shows a decrease in speleothem δ18O values from southeastern China to northwestern China. These δ18O spatial gradients could be attributed to the “rainout effect” and the amplification mechanism of the seasonal variations of precipitation δ18O. Moreover, Xianyun δ18O record captures the precursor event centered at 85.3 ± 0.3 kyr BP concurrent with the corresponding event in ice cores, revealing an atmospheric teleconnection between high and low latitudes. Unlike gradual cooling at the Greenland and Antarctic ice core records during mid-GIS 21, the Xianyun record reveals a relatively strong monsoon phase. We speculate that the cooling of the Southern Hemisphere (SH) may influence EASM activity through the intensification of cross-equatorial flow and weaken the impact of Northern Hemisphere (NH) high latitude climate, thus pointing to the role of SH climate on EASM on millennial-scale.
高分辨率石笋Ύ´18O记录了中国中南地区跨越MIS 3/2过渡期的亚洲季风变化
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