Response of heterogeneous rainfall variability in East Asia to Hadley circulation reorganization during the late Quaternary
Response of heterogeneous rainfall variability in East Asia to Hadley circulation reorganization during the late Quaternary
复制标题
晚第四纪东亚降雨非均质变率对哈德来环流重组的响应
DOI：
10.1016/j.quascirev.2020.106562
复制
发表时间：
2020-11
影响因子：
4
通讯作者：
Li Anchun
中科院分区：
文献类型：
--
作者：
Zhao Debo;Wan Shiming;Lu Zhengyao;Zhai Lina;Feng Xuguang;Shi Xuefa;Li Anchun
利用中国洞穴沉积物δ18O记录重建的第四纪东亚夏季降水演变在整个东亚地区具有一致性，长期以来一直被认为与季风强度相当。它的变化及其与全球气候的遥相关通常用热带辐合带的纬向移动来解释。然而，许多其他代用记录、气候模拟和气象观测表明，东亚不同地区在多个时间尺度上的降雨模式不一致。第四纪东亚夏季降水的这种空间异质性表明，该地区的水文气候并不完全由ITCZ的迁移所决定。本文报道了东海北方近400 ka降水演变的沉积记录，结合瞬态气候模式模拟，表明东亚中东南部与东亚北方和西南部降水在岁差带上存在异相关系。夏季北方高日射量对应于东亚北方和西南部降水强度的增加，而东亚中部降水强度则减少。我们把东亚降水的这种区域异质性归因于Hadley环流的重组，包括上升分支（ITCZ）和下降分支（副热带西风急流）的变化，以响应半球纬向温度梯度的变化。我们的结果强调了哈德利环流在东亚水文气候中的关键作用，并对未来的气候预测具有重要影响。
The Quaternary East Asian summer rainfall evolution reconstructed with the Chinese speleothem δ18O records shows the consistency throughout the region of East Asia, and has long been considered equivalent to the monsoon intensity. Its variation and teleconnection with global climate were usually interpreted by the meridional shift of the intertropical convergence zone (ITCZ). However, many other proxy records, climate simulations and meteorological observations suggest the inconsistent rainfall patterns in the different regions of East Asia on multi-timescales. Such spatial heterogeneity in Quaternary East Asian summer rainfall indicates that the hydroclimate in this region is not fully paced by the migration of the ITCZ. Here, we report a sediment record of rainfall evolution during the last 400 ka in the northern East China Sea, and this record, in combination with a transient climate model simulation, indicates an out-of-phase relationship between rainfall over middle-southeastern East Asia and northern and southwestern East Asia on the precession band, with high boreal summer insolation corresponding to the increased rainfall intensity in the northern and southwestern East Asia, however, decreased rainfall intensity in the middle East Asia. We attribute this regional heterogeneity in East Asian rainfall to the reorganization of the Hadley circulation, including shifts in the ascending branch (ITCZ) and descending branch (subtropical westerly jet), in response to changes in the hemispheric meridional temperature gradient. Our results highlight the crucial role of the Hadley circulation in the East Asian hydroclimate and have important implications for future climate projections.
登录
查看更多内容
影响因子：
16.6
作者：
Clemens SC;Holbourn A;Kubota Y;Lee KE;Liu Z;Chen G;Nelson A;Fox-Kemper B
通讯作者：
Fox-Kemper B
影响因子：
3.9
作者：
Egli, R
通讯作者：
Egli, R
影响因子：
5.2
作者：
Archer, Cristina L.;Caldeira, Ken
通讯作者：
Caldeira, Ken
影响因子：
4
作者：
Jule Xiao;Z. An;Tung-sheng Liu;Y. Inouchi;H. Kumai;Shusaku Yoshikawa;Yoichi Kondo
通讯作者：
Jule Xiao;Z. An;Tung-sheng Liu;Y. Inouchi;H. Kumai;Shusaku Yoshikawa;Yoichi Kondo
影响因子：
64.8
作者：
Cruz, FW;Burns, SJ;Viana, O
通讯作者：
Viana, O