气候变化领域集成服务门户(CCPortal): Impact of Intraseasonal Waves on Angolan Warm and Cold Events

CCPortal

DOI	10.1029/2020JC017088
	Impact of Intraseasonal Waves on Angolan Warm and Cold Events
	Imbol Koungue R.A.; Brandt P.
发表日期	2021
ISSN	21699275
卷号	126 期号:4
英文摘要	The intraseasonal variability of the tropical eastern boundary upwelling region in the Atlantic Ocean is investigated using multiyear mooring and satellite data. Pronounced oscillations of alongshore velocity and sea level off Angola at periods of about 90 and 120 days are observed. Similar spectral peaks are detected along the equator suggesting an equatorial forcing via equatorial and coastally trapped waves. Equatorial variability at 90 days is enhanced only in the eastern Atlantic likely forced by local zonal wind fluctuations. Variability at 120 days is generally stronger and linked to a second equatorial basin mode covering the whole equatorial basin. Besides forcing of the 120-day variability by equatorial zonal winds, additional forcing of the resonant basin mode likely originates in the central and western tropical North Atlantic. The coastally trapped waves generated at the eastern boundary by the impinging equatorial Kelvin waves that are detected through their variations in sea level anomaly are associated with corresponding sea surface temperature anomalies delayed by about 14 days. Off Angola, those intraseasonal waves interfere with major coastal warm and cold events that occur every few years by either enhancing them as for the Benguela Niño in 1995 or damping them as for the warm event in 2001. © 2021. The Authors.
英文关键词	Angola Current; Benguela Niños; equatorial and coastally trapped waves; equatorial basin mode; intraseasonal variability; thermocline feedback
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186404
作者单位	GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Christian-Albrechts-Universität zu Kiel, Kiel, Germany
推荐引用方式 GB/T 7714	Imbol Koungue R.A.,Brandt P.. Impact of Intraseasonal Waves on Angolan Warm and Cold Events[J],2021,126(4).
APA	Imbol Koungue R.A.,&Brandt P..(2021).Impact of Intraseasonal Waves on Angolan Warm and Cold Events.Journal of Geophysical Research: Oceans,126(4).
MLA	Imbol Koungue R.A.,et al."Impact of Intraseasonal Waves on Angolan Warm and Cold Events".Journal of Geophysical Research: Oceans 126.4(2021).