气候变化领域集成服务门户(CCPortal): Wind spatial structure triggers enso's oceanic warm water volume changes

CCPortal

DOI	10.1175/JCLI-D-20-0040.1
	Wind spatial structure triggers enso's oceanic warm water volume changes
	Neske S.; sneske@geomar.de; Mcgregor S.; Zeller M.; Dommenget D.
发表日期	2021
ISSN	08948755
起始页码	1985
结束页码	1999
卷号	34 期号:6
英文摘要	This study demonstrates that the generalization that strong anomalous equatorial Pacific westerly (easterly) winds during El Niño (La Niña) events display strong adjusted warm water volume (WWV) discharges (recharges) is often incorrect. Using ocean model simulations, we categorize the oceanic adjusted responses to strong anomalous equatorial winds into two categories: (i) transitioning (consistent with the above generalization) and (ii) neutral adjusted responses (with negligible WWV recharge and discharge). During the 1980-2016 period only 47% of strong anomalous equatorial winds are followed by transitioning adjusted responses, while the remaining are followed by neutral adjusted responses. Moreover, 55% (only 30%) of the strongest winds lead to transitioning adjusted responses during the pre-2000 (post-2000) period in agreement with the previously reported post-2000 decline of WWV lead time to El Niño-Southern Oscillation (ENSO) events. The prominent neutral adjusted WWV response is shown to be largely excited by anomalous wind stress forcing with a weaker curl (on average consistent with a higher ratio of off-equatorial to equatorial wind events) and weaker Rossby wave projection than the transitioning adjusted response. We also identify a prominent ENSO phase asymmetry where strong anomalous equatorial westerly winds (i.e., El Niño events) are roughly 1.6 times more likely to strongly dischargeWWVthan strong anomalous equatorial easterly winds (i.e., La Niña events) are to strongly rechargeWWV. This ENSO phase asymmetry may be added to the list of mechanisms proposed to explain why El Niño events have a stronger tendency to be followed by La Niña events than vice versa. © 2021 American Meteorological Society. All rights reserved.
英文关键词	Asymmetry; ENSO; Kelvin waves; Ocean dynamics; Rossby waves; Warm water volume; Wind Stress curl
语种	英语
scopus关键词	Atmospheric pressure; Climatology; Lanthanum; Mechanical waves; Anomalous winds; Equatorial Pacific; Equatorial winds; Ocean model simulations; Rossby wave; Southern oscillation; Spatial structure; Westerly winds; Wind; air-sea interaction; asymmetry; El Nino-Southern Oscillation; Kelvin wave; Rossby wave; seawater; spatial analysis; volume change; warm water; wind stress; Pacific Ocean; Pacific Ocean (Equatorial)
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/178684
作者单位	School of Earth, Atmosphere and Environment, Monash University, Clayton, Australia; ARC Centre of Excellence for Climate System Science, Monash University, Melbourne, Australia; GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; ARC Centre of Excellence for Climate Extremes, Monash University, Melbourne, Australia
推荐引用方式 GB/T 7714	Neske S.,sneske@geomar.de,Mcgregor S.,et al. Wind spatial structure triggers enso's oceanic warm water volume changes[J],2021,34(6).
APA	Neske S.,sneske@geomar.de,Mcgregor S.,Zeller M.,&Dommenget D..(2021).Wind spatial structure triggers enso's oceanic warm water volume changes.Journal of Climate,34(6).
MLA	Neske S.,et al."Wind spatial structure triggers enso's oceanic warm water volume changes".Journal of Climate 34.6(2021).