Differences and links between the East Asian and South Asian summer monsoon systems: Characteristics and Variability
Differences and links between the East Asian and South Asian summer monsoon systems: Characteristics and Variability
复制标题
东亚和南亚夏季风系统的差异和联系：特征和变化
DOI：
10.1007/s00376-017-7008-3
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发表时间：
2017-10-01
影响因子：
5.8
通讯作者：
Huangfu, Jingliang
中科院分区：
文献类型：
--
作者：
Huang, Ronghui;Liu, Yong;Huangfu, Jingliang
分析了东亚夏季风(EASM)和南亚夏季风(SASM)系统夏季降水和水汽输送特征及其时空变化的差异。结果表明，两种季风系统夏季降水特征存在明显差异。东亚夏季降水云系表现为层状和积云混合云系，而积云在SASM中占主导地位。这些差异可能是由于纬向环流和经向环流垂直切变的差异以及水汽输送通量的辐合造成的。此外，这两个系统夏季降水异常的主导模式在年际和年代际时间尺度上的时空特征也不同。然而，在夏季降水和水汽输送的时空变化方面，这两个季风系统之间存在着几个密切的联系。SASM和EASM地区夏季降水的第一模在年际和年代际时间尺度上表现出显著的负相关。这种密切关系可能与夏季降水距平经青藏高原东南部从印度向北中国的经向遥相关联系在一起，我们称之为亚洲夏季风降水的南亚/东亚遥相关型。谨以此文献给叶杜征教授，纪念他诞辰100周年，并为大气动力学的发展作出了巨大贡献。
This paper analyzes the differences in the characteristics and spatio-temporal variabilities of summertime rainfall and water vapor transport between the East Asian summer monsoon (EASM) and South Asian summer monsoon (SASM) systems. The results show obvious differences in summertime rainfall characteristics between these two monsoon systems. The summertime rainfall cloud systems of the EASM show a mixed stratiform and cumulus cloud system, while cumulus cloud dominates the SASM. These differences may be caused by differences in the vertical shear of zonal and meridional circulations and the convergence of water vapor transport fluxes. Moreover, the leading modes of the two systems' summertime rainfall anomalies also differ in terms of their spatiotemporal features on the interannual and interdecadal timescales. Nevertheless, several close links with respect to the spatiotemporal variabilities of summertime rainfall and water vapor transport exist between the two monsoon systems. The first modes of summertime rainfall in the SASM and EASM regions reveal a significant negative correlation on the interannual and the interdecadal timescales. This close relationship may be linked by a meridional teleconnection in the regressed summertime rainfall anomalies from India to North China through the southeastern part over the Tibetan Plateau, which we refer to as the South Asia/East Asia teleconnection pattern of Asian summer monsoon rainfall. The authors wish to dedicate this paper to Prof. Duzheng YE, and commemorate his 100th anniversary and his great contributions to the development of atmospheric dynamics.