气候变化领域集成服务门户(CCPortal): Climatology of easterly wave disturbances over the tropical South Atlantic

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DOI	10.1007/s00382-019-04667-7
	Climatology of easterly wave disturbances over the tropical South Atlantic
	Gomes H.B.; Ambrizzi T.; Pontes da Silva B.F.; Hodges K.; Silva Dias P.L.; Herdies D.L.; Silva M.C.L.; Gomes H.B.
发表日期	2019
ISSN	0930-7575
起始页码	1393
结束页码	1411
卷号	53 期号:2020-03-04
英文摘要	A 21-year climatology of Easterly Waves Disturbances (EWDs) over the tropical South Atlantic (TSA) has been examined using data from the European Centers for Medium-Range Weather Forecasting interim reanalysis (ERAI) and satellite data. This includes the frequency distribution of EWDs and their interannual variability. The large-scale environment associated with EWDs has been investigated for the coastal region of Northeast Brazil (NEB) for the rainy (April–August) season using a composite analysis. EWDs were first identified in ERAI, resulting in 518 observed cases. These were found to show notable interannual variability with around 16–40 episodes each year and with an average lifetime of 4–6 days. Of the identified EWDs, 97% reached the coast of NEB, of which 64% were convective in nature and 14% moved across the NEB region and reached the Amazon. The annual occurrence of EWDs seems to be lower (higher) during El Niño (La Niña). The monthly occurrence of EWDs shows higher activity in the rainy season. EWDs originate in association with four types of system: cold fronts, convective clusters from the west coast of Africa, Intertropical Convergence Zone and Tropical Upper Tropospheric Cyclonic Vortices. The composite analysis indicates strong relative vorticity and divergence anomalies at low levels, as well as in the vertical profiles of relative humidity and vertical velocity (omega). The precipitation composites show that the EWDs propagate between the TSA and NEB and contribute at least 60% of the total rainfall over the east coast of NEB throughout the rainy season. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Easterly waves disturbances; Northeast Brazil and climatology; Tropical South Atlantic
语种	英语
scopus关键词	annual variation; atmospheric wave; climatology; easterly wave; El Nino; intertropical convergence zone; La Nina; troposphere; weather forecasting; Atlantic Ocean; Atlantic Ocean (South); Brazil
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/146145
作者单位	Institute of Atmospheric Sciences, Federal University of Alagoas, Maceió, Brazil; Department of Atmospheric Sciences, University of Sao Paulo, São Paulo, Brazil; Capixaba Institute of Research, Technical Assistance and Rural Extension, Vitoria, Brazil; Department of Meteorology, University of Reading, Reading, United Kingdom; National Institute for Space Research, Cachoeira Paulista, Brazil
推荐引用方式 GB/T 7714	Gomes H.B.,Ambrizzi T.,Pontes da Silva B.F.,et al. Climatology of easterly wave disturbances over the tropical South Atlantic[J],2019,53(2020-03-04).
APA	Gomes H.B..,Ambrizzi T..,Pontes da Silva B.F..,Hodges K..,Silva Dias P.L..,...&Gomes H.B..(2019).Climatology of easterly wave disturbances over the tropical South Atlantic.Climate Dynamics,53(2020-03-04).
MLA	Gomes H.B.,et al."Climatology of easterly wave disturbances over the tropical South Atlantic".Climate Dynamics 53.2020-03-04(2019).