气候变化领域集成服务门户(CCPortal): Observed low-frequency linkage between Northern Hemisphere tropical expansion and polar vortex weakening from 1979 to 2012

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DOI	10.1016/j.atmosres.2020.105034
	Observed low-frequency linkage between Northern Hemisphere tropical expansion and polar vortex weakening from 1979 to 2012
	Cao Y.; Liang S.; Yu M.
发表日期	2020
ISSN	0169-8095
卷号	243
英文摘要	In recent decades, the northern hemisphere (NH) atmospheric meridional circulation has experienced unprecedented changes. The NH tropical belt is significantly expanding toward high latitudes, and the Arctic polar vortex is continually weakening. Both phenomena have led to severe consequences on the Earth's surface, such as more frequent droughts in the subtropics and accelerated sea ice loss in the Arctic. However, the potential linkage between these phenomena and the underlying mechanisms have rarely been discussed. In this study, we report strong observational evidence that the NH tropical boundary and tropospheric polar vortex are synchronously changing, based on analysis of long-term satellite records from 1979 to 2012. Our investigation suggests that both the variance of the NH tropical boundary and tropospheric polar vortex from 1979 to 2012 are associated to the natural anomaly of NH mid-latitude sea surface temperature. The low-frequency sea surface temperature anomalies over the North Pacific (i.e., the Pacific Decadal Oscillation, PDO) and Atlantic (i.e., the Atlantic Multidecadal Oscillation, AMO) could explain 61% of the NH tropical boundary variance and 56% of the polar vortex variance from 1979 to 2012. © 2020 Elsevier B.V.
关键词	Atmospheric temperature Oceanography Sea ice Submarine geophysics Surface properties Surface waters Troposphere Vortex flow Atlantic multidecadal oscillations Earth's surface Meridional circulation Northern hemisphere Northern Hemispheres Pacific decadal oscillation Sea surface temperature (SST)Sea surface temperature anomalies Tropics air-sea interaction boundary layer meridional circulation Northern Hemisphere polar vortex satellite data sea surface temperature tropical environment troposphere Arctic Atlantic Ocean Pacific Ocean Pacific Ocean (North)
语种	英语
来源机构	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132415
推荐引用方式 GB/T 7714	Cao Y.,Liang S.,Yu M.. Observed low-frequency linkage between Northern Hemisphere tropical expansion and polar vortex weakening from 1979 to 2012[J]. Atmospheric Research,2020,243.
APA	Cao Y.,Liang S.,&Yu M..(2020).Observed low-frequency linkage between Northern Hemisphere tropical expansion and polar vortex weakening from 1979 to 2012.,243.
MLA	Cao Y.,et al."Observed low-frequency linkage between Northern Hemisphere tropical expansion and polar vortex weakening from 1979 to 2012".243(2020).