气候变化领域集成服务门户(CCPortal): Possible semi-circumglobal teleconnection across Eurasia driven by deep convection over the Sahel

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DOI	10.1007/s00382-021-05804-x
	Possible semi-circumglobal teleconnection across Eurasia driven by deep convection over the Sahel
	Nakanishi T.; Tachibana Y.; Ando Y.
发表日期	2021
ISSN	0930-7575
起始页码	515
结束页码	535
英文摘要	The Sahel region, located between the tropical rainforests of Africa and the Sahara Desert, has rainfall that varies widely from year to year, associated with extremely deep convection. This deep convection, strongly heated by water vapor condensation, suggests the possibility of exerting a remote influence on mid- and high-latitude climate similar to the well-known influences of tropical oceanic convection on global climate. Here we investigate the possibility that deep convection over the Sahel initiates a semi-circumglobal teleconnection extending to eastern Eurasia. Statistical analysis and numerical experiments support the possible existence of this teleconnection at an interannual time scale. We propose that the anomalous heat source due to deep convection over the Sahel in the late monsoon season influences meandering of the mid-latitude jet stream over Europe through the combination of a Matsuno-Gill response and advection of absolute vorticity. This subtropical jet meander may in turn drive an eastward propagation of a Rossby wave across Eurasia as far as East Asia. Because deep convection over other subtropical land areas may exert a similar remote influence upon extratropical extreme weather, further studies of the influence of overland convection may provide us with an expanded comprehension of teleconnections. © 2021, The Author(s).
英文关键词	Convective activity; Linear regression; Rossby wave; Sahel; Teleconnection
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/183451
作者单位	Weather and Climate Dynamics Division, Faculty of Bioresources, Mie University, 1577 Kurimamachiya-cho, Tsu, Mie 514-8507, Japan; Faculty of Science, Niigata University, 8050 Ikarashi 2-no-cho, Nishi-Ku, Niigata, Niigata 950-2181, Japan
推荐引用方式 GB/T 7714	Nakanishi T.,Tachibana Y.,Ando Y.. Possible semi-circumglobal teleconnection across Eurasia driven by deep convection over the Sahel[J],2021.
APA	Nakanishi T.,Tachibana Y.,&Ando Y..(2021).Possible semi-circumglobal teleconnection across Eurasia driven by deep convection over the Sahel.Climate Dynamics.
MLA	Nakanishi T.,et al."Possible semi-circumglobal teleconnection across Eurasia driven by deep convection over the Sahel".Climate Dynamics (2021).