气候变化领域集成服务门户(CCPortal): Different impacts of the east asian winter monsoon on the surface air temperature in North America during ENSO and Neutral ENSO years

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DOI	10.1175/JCLI-D-18-0760.1
	Different impacts of the east asian winter monsoon on the surface air temperature in North America during ENSO and Neutral ENSO years
	Ma T.; Chen W.; Graf H.F.; Ding S.; Xu P.; Song L.; Lan X.
发表日期	2020
ISSN	0894-8755
起始页码	10671
结束页码	10690
卷号	33 期号:24
英文摘要	The present study investigates different impacts of the East Asian winter monsoon (EAWM) on surface air temperature (Ts) in North America (NA) during ENSO and neutral ENSO episodes. In neutral ENSO years, the EAWM shows a direct impact on the Ts anomalies in NA on an interannual time scale. Two Rossby wave packets appear over the Eurasian–western Pacific (upstream) and North Pacific–NA (downstream) regions associated with a strong EAWM. Further analysis suggests that the downstream wave packet is caused by reflection of the upstream wave packet over the subtropical western Pacific and amplified over the North Pacific. Also, the East Asian subtropical westerly jet stream (EAJS) is intensified in the central and downstream region over the central North Pacific. Hence, increased barotropic kinetic energy conversion and the interaction between transient eddies and the EAJS tend to maintain the circulation anomaly over the North Pacific. Therefore, a strong EAWM tends to result in warm Ts anomalies in northwestern NA via the downstream wave packet emanating from the central North Pacific toward NA. A weak EAWM tends to induce cold Ts anomalies in western-central NA with a smaller magnitude. However, in ENSO years, an anomalous EAJS is mainly confined over East Asia and does not extend into the central North Pacific. The results confirm that the EAWM has an indirect impact on the Ts anomalies in NA via a modulation of the tropical convection anomalies associated with ENSO. Our results indicate that, for seasonal prediction of Ts anomalies in NA, the influence of the EAWM should be taken into account. It produces different responses in neutral ENSO and in ENSO years. Ó 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Atmospheric temperature; Atmospheric thermodynamics; Energy conversion; Kinetic energy; Kinetics; Mechanical waves; Tropics; American meteorological societies; Barotropic kinetic energy; Circulation anomalies; Copyright informations; East Asian winter monsoon; Interannual time scale; Surface air temperatures; Westerly jet streams; Wave packets; air temperature; El Nino-Southern Oscillation; monsoon; Rossby wave; surface temperature; teleconnection; winter; Far East; North America; Pacific Ocean
语种	英语
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/171026
作者单位	Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; College of Earth and Planetary Sciences, University of the Chinese Academy of Sciences, Beijing, China; Institute of Atmospheric Sciences, Fudan University, Shanghai, China
推荐引用方式 GB/T 7714	Ma T.,Chen W.,Graf H.F.,et al. Different impacts of the east asian winter monsoon on the surface air temperature in North America during ENSO and Neutral ENSO years[J],2020,33(24).
APA	Ma T..,Chen W..,Graf H.F..,Ding S..,Xu P..,...&Lan X..(2020).Different impacts of the east asian winter monsoon on the surface air temperature in North America during ENSO and Neutral ENSO years.Journal of Climate,33(24).
MLA	Ma T.,et al."Different impacts of the east asian winter monsoon on the surface air temperature in North America during ENSO and Neutral ENSO years".Journal of Climate 33.24(2020).