气候变化领域集成服务门户(CCPortal): Changes in the Relationship Between the Variation in Spring Eurasian Snow and the Surface Temperature Over the Northern Hemisphere Around the Late 1980s

CCPortal

DOI	10.1029/2020JD032982
	Changes in the Relationship Between the Variation in Spring Eurasian Snow and the Surface Temperature Over the Northern Hemisphere Around the Late 1980s
	Jia X.; Wang M.; Qian Q.; Wu R.
发表日期	2021
ISSN	2169897X
卷号	126 期号:4
英文摘要	The spring snow cover extent (SCE) over central-eastern Eurasia (SCE_CEE) shows an obvious decrease around 1988. The period 1979–2019 is thus divided into two subperiods spanning 1967–1988 (P1) and 1989–2019 (P2) to investigate the interdecadal changes in the characteristics of the SCE_CEE and its relationship with surface air temperature (SAT) in the Northern Hemisphere. Positive SCE_CEE anomalies are related to a cooler Eurasia–warmer North America (CEWN) spring SAT pattern, which obviously intensifies from P1 to P2. The possible mechanisms responsible for the interdecadal changes in this snow–SAT relationship are investigated. A local energy budget analysis shows that the impact of the SCE_CEE on the overlying atmosphere is weak and the atmospheric circulation anomalies associated with the SCE_CEE variation are confined mainly to eastern Eurasia and the North Pacific in P1. In contrast, positive SCE_CEE anomalies have a significant cooling effect on the atmospheric column through anomalous heat fluxes and wind-related cold advection in P2. In P2, more SCE_CEE is associated with an anomalous cyclone in the upper atmosphere, which imposes a significant vorticity perturbation near the East Asian westerly jet core and induces eastward propagation of perturbations. The sea surface temperature anomalies in the North Pacific and the North Atlantic as well as the mean flow over the Eurasian continent help to maintain the zonal propagation of this perturbation, thus forming a hemispheric atmospheric wave pattern that contributes to the enhanced snow–CEWN SAT relationship in P2. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	a hemispheric wave pattern; cooler Eurasia–warmer North America SAT pattern; Eurasian snow cover; interdecadal change; spring
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185475
作者单位	Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, School of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang, China
推荐引用方式 GB/T 7714	Jia X.,Wang M.,Qian Q.,et al. Changes in the Relationship Between the Variation in Spring Eurasian Snow and the Surface Temperature Over the Northern Hemisphere Around the Late 1980s[J],2021,126(4).
APA	Jia X.,Wang M.,Qian Q.,&Wu R..(2021).Changes in the Relationship Between the Variation in Spring Eurasian Snow and the Surface Temperature Over the Northern Hemisphere Around the Late 1980s.Journal of Geophysical Research: Atmospheres,126(4).
MLA	Jia X.,et al."Changes in the Relationship Between the Variation in Spring Eurasian Snow and the Surface Temperature Over the Northern Hemisphere Around the Late 1980s".Journal of Geophysical Research: Atmospheres 126.4(2021).