气候变化领域集成服务门户(CCPortal): Hawaiian regional climate variability during two types of El Niño

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DOI	10.1175/JCLI-D-19-0985.1
	Hawaiian regional climate variability during two types of El Niño
	Lu B.-Y.; Chu P.-S.; Kim S.-H.; Karamperidou C.
发表日期	2020
ISSN	0894-8755
起始页码	9929
结束页码	9943
卷号	33 期号:22
英文摘要	The large-scale atmospheric circulation of the North Pacific associated with two types of El Niño—the eastern Pacific (EP) and central Pacific (CP)—is studied in relation to Hawaiian winter (December–February) rainfall and temperature. The eastern and central equatorial Pacific undergo active convective heating during EP El Niño winters. The local Hadley circulation is enhanced and an upper-level westerly jet stream of the North Pacific is elongated eastward. Due to the impact of both phenomena, stronger anomalous descending motion, moisture flux divergence anomalies near Hawaii, and reduction of easterly trade winds, which are characteristic of EP winters, are unfavorable for winter rainfall in Hawaii. As a result of this robust signal, dry conditions prevail in Hawaii and the standard deviation of rainfall during EP winters is smaller than the climatology. For CP winters, the maximum equatorial ocean warming is weaker and shifted westward to near the date line. The subtropical jet stream retreats westward relative to EP winters and the anomalously sinking motion near Hawaii is variable and generally weaker. Although the anomalous moisture flux divergence still exists over the subtropical North Pacific, its magnitude is weaker relative to EP winters. Without strong external forcing, rainfall in the Hawaiian Islands during CP winters is close to the long-term mean. The spread of rainfall from one CP event to another is also larger. The near-surface minimum temperature from three stations in Hawaii reveals cooling during EP winters and slight warming during CP winters. © 2020 American Meteorological Society.
英文关键词	Climatology; Moisture; Tropics; Atmospheric circulation; Convective heating; Equatorial Pacific; External forcing; Hadley circulation; Minimum temperatures; Standard deviation; Upper-level westerly jet stream; Rain; air temperature; annual variation; climate variation; El Nino; Hadley cell; jet stream; rainfall; regional climate; seasonal variation; Hawaii [(ISL) Hawaiian Islands]; Hawaii [United States]; Hawaiian Islands; Pacific Ocean; Pacific Ocean (Central); Pacific Ocean (East); Pacific Ocean (North)
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/171079
作者单位	Department of Atmospheric Sciences, School of Ocean and Earth Science and Technology, University of Hawai‘i at Manoa, Honolulu, HI, United States
推荐引用方式 GB/T 7714	Lu B.-Y.,Chu P.-S.,Kim S.-H.,et al. Hawaiian regional climate variability during two types of El Niño[J],2020,33(22).
APA	Lu B.-Y.,Chu P.-S.,Kim S.-H.,&Karamperidou C..(2020).Hawaiian regional climate variability during two types of El Niño.Journal of Climate,33(22).
MLA	Lu B.-Y.,et al."Hawaiian regional climate variability during two types of El Niño".Journal of Climate 33.22(2020).