Abstract
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.
摘要
东亚夏季风和南亚夏季风是亚洲夏季风的重要组成部分, 两者既有区别又有联系. 本文从气候态特征和时空模态两方面, 分析了两个季风区夏季降水和水汽输送之间的差异和联系. 结果表明北半球夏季, 两个季风区纬向风和径向风垂直切变和水汽输送均不同, 这造成了两个季风区层云和季云降水的特征有所差异, 表现为东亚季风区降水表现为层云和积云降水的贡献相当, 而南亚季风雨以季云降水为主. 同时, 在年际和年代际时间尺度上, 东亚季风区和南亚季风区夏季降水变异的时空特征也不同. 但是, 两个区域降水变化的主导模态之间仍存在显著的负相关关系. 这种联系可能是由于在亚洲大路上存在由印度向中国北部经向遥相关型(南亚东亚遥相关)而造成的. 在叶笃正先生诞辰100周年之际, 作者们谨以此文纪念叶笃正先生对大气动力学发展的卓越贡献.
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Acknowledgements
This study was supported jointly by the National Key Research and Development Program (Grant No. 2016YFA0600603), the National Basic Research of China (Grant No. 2013CB430201) and the National Natural Science Foundation of China (Grant Nos. 41605058, 41375065, 41461164005, 41230527, and 41375082).
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Huang, R., Liu, Y., Du, Z. et al. Differences and links between the East Asian and South Asian summer monsoon systems: Characteristics and Variability. Adv. Atmos. Sci. 34, 1204–1218 (2017). https://doi.org/10.1007/s00376-017-7008-3
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DOI: https://doi.org/10.1007/s00376-017-7008-3
Keywords
- East Asian summer monsoon
- South Asian summer monsoon
- spatiotemporal variability
- rainfall
- water vapor transport