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Assessment of the Intertropical Convergence Zone over the Atlantic ocean through an Algorithm Based on Precipitation

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Journal of Atmospheric Science Research 2024年第1期7卷 59-73页

作者： na.a. chrysostomo de oliveira.nogueira.pedro henrique gomes ma.ha.o Michelle Simões Reboita André Luiz Reis Reis natural Resources Institute Federal University of ItajubáItajubáMinas Gerais37500-903Brazil

The Intertropical Convergence Zone(ITCZ)is a key atmospheric system on a global scale,primarily driven by trade wind convergence near the *** ITCZ plays a crucial role in modulating the climate of the borders of tropical continental *** instance,Northeastern Brazil experiences a climate influenced by the ITCZ over the Atlantic *** some periods,the ITCZ exhibits double bands,known as the double *** the features of the ITCZ have been described using various approaches and atmospheric variables,there is still a lack of regional studies focusing on the ITCZ and double ITCZ in the Atlantic *** this context,the main goals of this study are(1)to describe a simple algorithm based on precipitation to identify the ITCZ and double ITCZ,(2)to present a climatology(1997-2022)of the position,width,and intensity of these two convective bands,and(3)to investigate variabilities in the ITCZ characteristics associated with anomalies of sea surface temperature(SST)in the tropical Pacific and Atlantic *** double ITCZ typically occurs southward of the main cloud band,and between February and April,both bands are more distant(~4.5°).In the western sector of the Atlantic ocean,the ITCZ and its double band extend to more southerly latitudes in austral *** the entire Atlantic basin,the annual mean of the latitudinal position,width,and intensity of the ITCZ is 4.9°N,4.2°,and 11 mm/day,respectively,while for the double ITCZ,it is 0.4°N,2.6°,10.3 mm/day,*** the SST anomalies in the Pacific ocean(El Niño and La Niña episodes)affect more the ITCZ width,the SST anomalies in the Tropical South Atlantic affect both its position and width.

关键词： Double ITCZ Precipitation Latitudinal position Northeastern Brazil Atlantic ocean ENSo

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