气候变化领域集成服务门户(CCPortal): Understanding the interannual variations of the zonal mean Indian summer monsoon seasonal rainfall

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DOI	10.1007/s00382-019-04881-3
	Understanding the interannual variations of the zonal mean Indian summer monsoon seasonal rainfall
	Dubey S.; Misra V.
发表日期	2019
ISSN	0930-7575
起始页码	5547
结束页码	5559
卷号	53 期号:2020-09-10
英文摘要	In this study, we seek to understand the variations of the zonal mean Indian summer monsoon (ISM). It is observed that the zonal mean precipitation anomalies explain about 20–30% of the total seasonal precipitation of the ISM. Additionally, we also show that the interannual anomalies of the ISM, at least for some of the most extreme seasons display significant zonal symmetry. Therefore, understanding the interannual variations of the zonal mean precipitation is quite relevant. Furthermore, the reduced and simplified dimensionality of the zonally symmetric framework is an additional attraction. Our study shows that the zonal mean precipitation anomalies of the ISM are significantly correlated with the corresponding anomalies of the vertically integrated moist static energy (H) at interannual scales. The forcing terms of the tendency of the zonal mean H of the ISM is dominated by the meridional flux of H by the Hadley cell followed by comparably smaller, yet, significant forcing terms of transverse boundary and vertical fluxes of H. We find that the individual correlations of the zonal mean precipitation anomalies of the ISM with each of these dominant terms of H are comparably weak in the core latitudes of the ISM. But some of the relatively weaker forcing terms of H like the radiative heating and the diffusion of the enthalpy fluxes display a very strong relationship with the corresponding zonal mean precipitation anomalies. These results suggest that although the description of the regional Hadley cell offers a heuristic model to describe the ISM variation, it belies the intricacies of the forcing terms that maintain it. Our study suggests that the challenge of the ISM seasonal rainfall anomaly prediction even in a reduced dimensional space of a zonally symmetric framework requires all the forcing terms of H with reasonable fidelity, irrespective of their contribution to the variations of H. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
语种	英语
scopus关键词	annual variation; climate modeling; monsoon; precipitation (climatology); principal component analysis; regional climate; summer; India
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145903
作者单位	Centre for Atmospheric Sciences, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India; Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, United States; Center for Ocean-Atmospheric Prediction Studies, Florida State University, Tallahassee, FL, United States; Florida Climate Institute, Florida State University, Tallahassee, FL, United States
推荐引用方式 GB/T 7714	Dubey S.,Misra V.. Understanding the interannual variations of the zonal mean Indian summer monsoon seasonal rainfall[J],2019,53(2020-09-10).
APA	Dubey S.,&Misra V..(2019).Understanding the interannual variations of the zonal mean Indian summer monsoon seasonal rainfall.Climate Dynamics,53(2020-09-10).
MLA	Dubey S.,et al."Understanding the interannual variations of the zonal mean Indian summer monsoon seasonal rainfall".Climate Dynamics 53.2020-09-10(2019).