Strong coupling of the East Asian summer monsoon and hydroclimate footprints during 53–47 ka
Strong coupling of the East Asian summer monsoon and hydroclimate footprints during 53–47 ka
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DOI：
10.1016/j.palaeo.2022.111003
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发表时间：
2022-04
期刊：
影响因子：
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通讯作者：
Wei Huang;Jinguo Dong;Q. Shao;F. Duan;Yi Wang
中科院分区：
文献类型：
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作者：
Wei Huang;Jinguo Dong;Q. Shao;F. Duan;Yi Wang
通过对中国北方石笋的δ 18 O、δ 13 C和微量元素等多指标分析，重建了53.8-47.4 ka（BP，1950 CE以前）东亚夏季风强度和水文气候条件。我们的δ 18 O和δ 13 C记录，24年分辨率，清楚地记录了Dansgaard-Oeschger（DO）事件14和13。在我们的δ 18 O和δ 13 C记录中，首次发现了与NGRIP冰芯一样的DO 13明显的双峰结构。这种较强的对应关系表明，东亚夏季风系统通过海气耦合对北大西洋气候变化作出了敏感而迅速的响应。δ ~（18）O记录表明，东亚夏季风强度在DO_（14）晚期（51.1- 50.3ka）突然减弱。这一突变不同于我国中南部石笋δ 18 O记录。另一方面，在溶解氧循环的时间尺度上，代表当地水文气候变化的δ 13 C和微量元素记录与反映东亚夏季风系统完整性的δ 18 O记录吻合较好。这种协方差分析表明，大尺度东亚夏季风环流的移动对中国北方地区的水文变化具有调制作用。进一步比较发现，中国北方和东南部51.5- 47.4ka的千年降水变化之间存在反相关关系。这种反相关类似于观测到的现今降水中的“南北”偶极模式。总体而言，这项研究推进了我们对东亚夏季风降水在千年时间尺度上的时空演变的理解。
A multi-proxy (δ18O, δ13C and trace elements) analysis of an absolutely-dated stalagmite in northern China is conducted to reconstruct the East Asian summer monsoon (EASM) intensity and local hydroclimate conditions during the period of 53.8–47.4 ka (BP, before 1950 CE). Our δ18O and δ13C records, with 24-yr resolution, clearly register the Dansgaard-Oeschger (DO) events 14 and 13. A clear double-peak structure for DO13, as previously detected in the NGRIP ice core, is identified in our δ18O and δ13C records, for the first time. This strong correspondence at the finer time-scale indicates a sensitive and rapid response of the EASM system to the North Atlantic climate changes through air-sea coupling. Our δ18O record shows that the EASM intensity deceased abruptly during latter stage of DO14 (51.1–50.3 ka). This abrupt change is different from other stalagmite δ18O records from central and southern China. On the other hand, both the δ13C and trace element records, representing local hydroclimatic changes, match well with the δ18O record, reflecting an integrated EASM system, on the timescale of the DO cycles. The covariance suggests that the hydrological variation in northern China could be modulated by the movement of the large-scale EASM circulation. Further comparison displays an anti-correlated relationship between the millennial precipitation changes in northern and southeastern China during the period of 51.5–47.4 ka. This anti-correlation is analogous to the “North-South” dipole mode in observed present-day precipitation. Overall, this study advances our understanding of the spatial and temporal evolution of the EASM precipitation on the millennial timescale.