气候变化领域集成服务门户(CCPortal): Is the boreal spring tropical Atlantic variability a precursor of the Equatorial Mode?

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DOI	10.1007/s00382-019-04851-9
	Is the boreal spring tropical Atlantic variability a precursor of the Equatorial Mode?
	Martín-Rey M.; Lazar A.
发表日期	2019
ISSN	0930-7575
起始页码	2339
结束页码	2353
卷号	53 期号:2020-03-04
英文摘要	The Equatorial Mode (EM) governs the tropical Atlantic inter-annual variability during boreal summer. It has profound impacts on the climate of adjacent and remote areas. However, predicting the EM is one of the most challenging and intriguing issues for the scientific community. Recent studies have suggested a possible connection between the boreal spring Meridional Mode (MM) and the EM through ocean wave propagation. Here, we use a set of sensitivity experiments with a medium-resolution ocean model to determine the precursor role of a MM to create equatorial SST variability. Our results demonstrate that boreal summer equatorial SSTs following a MM, are subject to two counteracting effects: the local wind forcing and remotely-excited oceanic waves. For a positive MM, the anomalous easterly winds blowing along the equator, shallow the thermocline, cooling the sea surface via vertical diffusion and meridional advection. Anomalous wind curl excites a downwelling Rossby wave north of equator, which is reflected at the western boundary becoming an equatorial Kelvin wave (KW). This downwelling KW propagates eastward, deepening the thermocline and activating the thermocline feedbacks responsible for the equatorial warming. Moreover, the local wind forcing and RW-reflected mechanism have a significant and comparable impact on the equatorial SST variability. Changes in the intensity and persistence of these distinct forcings will determine the equatorial SST response during boreal summer. Our results give a step forward to the improvement of the EM predictability. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Equatorial Mode; Meridional Mode; Ocean waves; SST variability; Tropical Atlantic
语种	英语
scopus关键词	annual variation; climate oscillation; model; ocean wave; sea surface temperature; spring (season); wind forcing; Atlantic Ocean; Atlantic Ocean (Tropical)
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146091
作者单位	Laboratoire d’Oceanographie et du Climat: Expérimentation et Approches Numériques (LOCEAN), Université Pierre et Marie Curie (UPMC), Universités Sorbonnes, Paris, France; UMR5318 CECI CNRS-CERFACS, Toulouse, France; Departamento de Oceanografía Física y Tecnológica, Instituto de Ciencias del Mar (ICM-CSIC), Passeig Marítim de la Barceloneta, 37-49, Barcelona, 08003, Spain
推荐引用方式 GB/T 7714	Martín-Rey M.,Lazar A.. Is the boreal spring tropical Atlantic variability a precursor of the Equatorial Mode?[J],2019,53(2020-03-04).
APA	Martín-Rey M.,&Lazar A..(2019).Is the boreal spring tropical Atlantic variability a precursor of the Equatorial Mode?.Climate Dynamics,53(2020-03-04).
MLA	Martín-Rey M.,et al."Is the boreal spring tropical Atlantic variability a precursor of the Equatorial Mode?".Climate Dynamics 53.2020-03-04(2019).