气候变化领域集成服务门户(CCPortal): Relative roles of energy and momentum fluxes in the tropical response to extratropical Thermal Forcing

CCPortal

DOI	10.1175/JCLI-D-20-0151.1
	Relative roles of energy and momentum fluxes in the tropical response to extratropical Thermal Forcing
	Hwang Y.-T.; Tseng H.-Y.; Li K.-C.; Kang S.M.; Chen Y.-J.; Chiang J.C.H.
发表日期	2021
ISSN	08948755
起始页码	3771
结束页码	3786
卷号	34 期号:10
英文摘要	This study investigates the transient responses of atmospheric energy and momentum fluxes to a time-invariant extratropical thermal heating in an atmospheric model coupled to an aquaplanet mixed layer ocean with the goal of understanding the mechanisms and time scales governing the extratropical-to-tropical connection. Two distinct stages are observed in the teleconnection: 1) A decrease in the meridional temperature gradient in midlatitudes leads to a rapid weakening of the eddy momentum flux and a slight reduction of the Hadley cell strength in the forced hemisphere. 2) The subtropical trades in the forced hemisphere decrease and reduce evaporation. The resulting change to sea surface temperature leads to the development of a cross-equatorial Hadley cell, and the intertropical convergence zone shifts to the warmer hemisphere. The Hadley cell weakening in the first stage is related to decreased eddy momentum flux divergence, and the response time scale is independent of the mixed layer depth. In contrast, the time taken for the development of the cross-equatorial cell in the latter stage increases as the mixed layer depth increases. Once developed, the deep tropical cross-equatorial cell response is an order of magnitude stronger than the initial subtropical response and dominates the anomalous circulation. The analysis combines the momentum and energetic perspectives on this extratropical-to-tropical teleconnection and moreover shows that the subtropical circulation changes associated with the momentum budget occur with a time scale that is distinct from the deep tropical response determined by the thermal inertia of the tropical ocean. Ó 2021 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy
英文关键词	Air-sea interaction; Energy transport; Hadley circulation; Momentum; Teleconnections
语种	英语
scopus关键词	Budget control; Cells; Clouds; Cytology; Oceanography; Surface waters; Time measurement; Transient analysis; Tropics; American meteorological societies; Circulation changes; Copyright informations; Eddy momentum flux; Intertropical convergence zone; Meridional temperature gradient; Mixed layer depths; Sea surface temperature (SST); Momentum
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178560
作者单位	Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan; Central Weather Bureau, Taipei, Taiwan; School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan, South Korea; Department of Geography, University of California, Berkeley, Berkeley, CA, United States
推荐引用方式 GB/T 7714	Hwang Y.-T.,Tseng H.-Y.,Li K.-C.,et al. Relative roles of energy and momentum fluxes in the tropical response to extratropical Thermal Forcing[J],2021,34(10).
APA	Hwang Y.-T.,Tseng H.-Y.,Li K.-C.,Kang S.M.,Chen Y.-J.,&Chiang J.C.H..(2021).Relative roles of energy and momentum fluxes in the tropical response to extratropical Thermal Forcing.Journal of Climate,34(10).
MLA	Hwang Y.-T.,et al."Relative roles of energy and momentum fluxes in the tropical response to extratropical Thermal Forcing".Journal of Climate 34.10(2021).