气候变化领域集成服务门户(CCPortal): Disparate midlatitude responses to the eastern pacific el niño

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DOI	10.1175/JCLI-D-20-0246.1
	Disparate midlatitude responses to the eastern pacific el niño
	Shiozaki M.; Enomoto T.; Takaya K.
发表日期	2021
ISSN	0894-8755
起始页码	773
结束页码	786
卷号	34 期号:2
英文摘要	To investigate the disparate influences of the eastern Pacific (EP) El Niño on the winter climate in the Far East, we conducted composite analyses using long-term reanalysis datasets. Our analysis shows that the western Pacific (WP) pattern dominates in the warm winter (typical) composite and the Pacific-North American (PNA) pattern dominates in the non-warm winter (atypical) composite. In the warm winter case, the amplitudes of the negative sea surface temperature (SST) anomalies in the western Pacific Ocean are large whereas in the non-warm winter case, these amplitudes are small. In addition, the Indian Ocean basin warming occurs following the Indian Ocean dipole mode, as seen in the warm winter composite. We investigated the dynamical mechanisms responsible for the disparate midlatitude responses to the EP El Niño by focusing on Rossby wave sources and propagation. These SST anomalies modulate the Walker and Hadley circulations and the convective activity in the western Pacific Ocean. Upper-tropospheric divergences at the midlatitudes due to the anomalous Hadley circulation result in different teleconnection patterns. In the warm winter composite, the anticyclonic anomaly in the southern part of the WP pattern is created by the upstream negative Rossby wave source, while the other cyclonic anomaly is reinforced by the northward Rossby wave propagation. The cyclonic second and fourth centers of action of the PNA pattern are created by the positive Rossby wave sources. Furthermore, the equatorial SST gradient near the date line is found be a good precursor of the winter climate in the Far East. © 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	Mechanical waves; Surface waters; Wave propagation; Anticyclonic anomalies; Convective activity; Dynamical mechanisms; Hadley circulation; Indian Ocean dipole; ROSSBY wave propagation; Sea surface temperature anomalies; Teleconnection patterns; Oceanography; air-sea interaction; climate oscillation; El Nino; midlatitude environment; Rossby wave; teleconnection; winter; Pacific Ocean; Pacific Ocean (East)
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/170951
作者单位	Graduate School of Science, Kyoto University, Kyoto, Japan; Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan; Application Laboratory, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan; Department of Astrophysics and Atmospheric Sciences, Kyoto Sangyo University, Kyoto, Japan; Research Institute for Applied Mechanics, Kyushu University, Fukuoka, Japan
推荐引用方式 GB/T 7714	Shiozaki M.,Enomoto T.,Takaya K.. Disparate midlatitude responses to the eastern pacific el niño[J],2021,34(2).
APA	Shiozaki M.,Enomoto T.,&Takaya K..(2021).Disparate midlatitude responses to the eastern pacific el niño.Journal of Climate,34(2).
MLA	Shiozaki M.,et al."Disparate midlatitude responses to the eastern pacific el niño".Journal of Climate 34.2(2021).