Linkages between the South and East Asian Monsoon Water Vapor Transport during Boreal Summer

Linkages between the South and East Asian Monsoon Water Vapor Transport during Boreal Summer
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北半球夏季南亚和东亚季风水汽输送之间的联系

DOI:
10.1175/jcli-d-18-0498.1
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发表时间:
2019-06
期刊:
影响因子:
4.9
通讯作者:
Huang Ronghui
Huang Ronghui
中科院分区:
地球科学2区
文献类型:
--
作者:
Yong Liu;Huang Ronghui

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本研究提供了一个水汽输送(WVT)的南亚和东亚夏季风(SASM和EASM)之间的联系的角度来看,并指出两个强大的耦合模式的垂直集成WVT(VIWVT)的两个季风,占90%以上的总平方协方差分数。第一个耦合模式[奇异值分解模式1(SVD 1模式)]描述了SASM和EASM上的纬向偶极子VIWVT异常之间的纬向联系,而第二个耦合模式(SVD 2模式)描述了SASM上的异常气旋/反气旋VIWVT和EASM上的纬向波状VIWVT之间的纬向联系。SVD 1模态与西北太平洋副热带高压异常有关,主要与厄尔尼诺/拉尼娜(ENSO)和印度洋海盆模态(IOBM)SST增冷的过渡阶段有关。自20世纪70年代后期以来,VIWVT在SVD 1模态中的纬向连接经历了明显的加强,这可能是由于ENSO/IOBM在20世纪70年代后期之后对EASM和SASM的影响加强。SVD 2模态由环全球遥相关(CGT)型连接,并与ENSO和夏季北大西洋三极(NAT)SST异常的发展阶段相关。在SVD 2模式的纬向VIWVT连接强烈调制的SASM-CGT连接,并揭示了显着减弱,自20世纪70年代末,但在20世纪90年代初后重新加强。这可能与70年代末以来ENSO-SASM关系减弱和90年代初以来印度夏季降水的年代际减少有关。
This study provides a water vapor transport (WVT) perspective on the linkages between the South Asian and East Asian summer monsoons (SASM and EASM) and indicates two robustly coupled modes of the vertical integrated WVT (VIWVT) over the two monsoons that accounts for above 90% of the total squared covariance fraction. The first coupled mode [singular value decomposition mode 1 (SVD1 mode)] depicts a meridional linkage between the meridional dipole VIWVT anomalies over both the SASM and EASM, while the second coupled mode (SVD2 mode) illustrates a zonal connection of an anomalous cyclonic/anticyclonic VIWVT over the SASM and a zonal wavelike VIWVT over the EASM. The SVD1 mode is linked through the anomalous subtropical high over the western North Pacific (WNPSH) and is primarily associated with the transition phase of El Niño/La Niña (ENSO) and simultaneous Indian Ocean basin mode (IOBM) SST warming/cooling. The meridional connection of the VIWVT in the SVD1 mode experienced a clear intensification since the late 1970s that may be attributed to the strengthened impacts of the ENSO/IOBM on the EASM and SASM after the late 1970s. The SVD2 mode is connected by the circumglobal teleconnection (CGT) pattern and related to the developing phase of ENSO and summer North Atlantic tripole (NAT) SST anomalies. The zonal VIWVT connection in SVD2 mode is strongly modulated by the SASM–CGT connections and reveals significant weakening since the late 1970s but reintensifies after the early 1990s. This may be associated with the weakened ENSO–SASM relationship after the late 1970s and interdecadal decreasing of the all Indian summer rainfall since the early 1990s.
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