气候变化领域集成服务门户(CCPortal): Tropical intraseasonal oscillation at monthly time scale during boreal summer and winter

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DOI	10.1007/s00382-019-04712-5
	Tropical intraseasonal oscillation at monthly time scale during boreal summer and winter
	Krishnamurthy V.; Hazra A.
发表日期	2019
ISSN	0930-7575
起始页码	3387
结束页码	3407
卷号	53 期号:2020-05-06
英文摘要	This study describes the space–time structure of an intraseasonal oscillation with the time scale of a month over the South Asian monsoon region and the tropical Pacific for the boreal summer and winter seasons. These nonlinear oscillations were extracted by applying multichannel singular spectrum analysis on daily anomalies of three-dimensional diabatic heating separately during the summer and winter. The monthly oscillations (MOs) are distinct from the leading monsoon intraseasonal oscillation with a period of 45 days during the summer and the Madden–Julian Oscillation during the winter. The summer MO exhibits horizontal quadrupole structure predominantly in the Northern Hemisphere and propagates eastward over the Indian region and westward over the Pacific along with northward movement. The winter MO is confined to the equatorial region in the Southern Hemisphere and propagates eastward and southward. Both the summer and winter MOs consist of propagating deep vertical columns of heating and cooling anomalies. The associated fields of convection, precipitation and three-dimensional circulation show similar patterns and propagation. The corresponding specific humidity has revealed moisture preconditioning for horizontal propagation and co-located vertical advection. However, there is no clear pattern of ocean–atmosphere interaction associated with the MO as seen in the examination of sea surface temperature and latent heat flux. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Diabatic heating; Indian monsoon; Intraseasonal oscillation; Tropical climate
语种	英语
scopus关键词	diabatic process; heat flux; heating; Madden-Julian oscillation; monsoon; oscillation; seasonal variation; surface temperature; tropical meteorology
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/146024
作者单位	Center for Ocean-Land-Atmosphere Studies, George Mason University, 4400 University Drive, Fairfax, VA 22030, United States; Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, United States; Hydrological Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United States
推荐引用方式 GB/T 7714	Krishnamurthy V.,Hazra A.. Tropical intraseasonal oscillation at monthly time scale during boreal summer and winter[J],2019,53(2020-05-06).
APA	Krishnamurthy V.,&Hazra A..(2019).Tropical intraseasonal oscillation at monthly time scale during boreal summer and winter.Climate Dynamics,53(2020-05-06).
MLA	Krishnamurthy V.,et al."Tropical intraseasonal oscillation at monthly time scale during boreal summer and winter".Climate Dynamics 53.2020-05-06(2019).