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dc.contributor.authorAndreoli, Rita Valéria-
dc.contributor.authorSouza, Rodrigo Augusto Ferreira de-
dc.contributor.authorKayano, Mary Toshie-
dc.contributor.authorCândido, Luiz Antônio-
dc.description.abstractPrevious papers have shown that the rainfall anomalies over the Amazon region result from the independent or combined effects of the eastern tropical Pacific and Atlantic Basins. Here, the monthly rainfall data of Itaituba, Manaus, Parintins, and Santarém for the 1931-1996 period has been used to classify its dry and rainy seasons into dry, very dry, wet, and very wet categories. The sea surface temperature (SST) and sea level pressure (SLP) patterns associated with these climate conditions in the central and eastern Amazon are discussed in terms of the relative influence of the tropical Atlantic and Pacific sectors, as well as their seasonal differences. These seasonal differences are, in part, determined by the seasonal phase locking of the El Niño-Southern Oscillation (ENSO) and Atlantic equatorial modes. The rainy season cases are mostly driven by the ENSO and the inter-hemispheric SST gradient mode in the tropical Atlantic, and the dry season cases, by the Atlantic equatorial mode (AEM). A new result here is the role of the inter-Pacific-Atlantic anomalous SST gradient mode on the rainfall anomalies. This mode acts concordantly with the Atlantic modes on the rainfall over the central and eastern Amazon, and is responsible for precipitation extreme cases during the dry season and for the very wet rainy season case. In other words, the intense inter-Pacific-Atlantic mode for these cases is the differential factor in relation to the moderate cases. The results here, especially in relation to the role of the inter-Pacific-Atlantic gradient in the central and eastern Amazon precipitation, have not been discussed before and should be taken into consideration in the diagnostic activities. © 2011 Royal Meteorological Society.en
dc.relation.ispartofVolume 32, Número 8, Pags. 1193-1205pt_BR
dc.subjectAmazon Regionen
dc.subjectAtlantic Basinen
dc.subjectAtmospheric Patternen
dc.subjectClimate Conditionen
dc.subjectClimate Variabilityen
dc.subjectCombined Effecten
dc.subjectDifferential Factorsen
dc.subjectDry Seasonsen
dc.subjectEastern Amazonsen
dc.subjectEastern Tropical Pacificen
dc.subjectNew Resultsen
dc.subjectPacific Sectoren
dc.subjectPrecipitation Extremesen
dc.subjectRainfall Anomalyen
dc.subjectRainfall Dataen
dc.subjectRainy Seasonsen
dc.subjectSea Level Pressureen
dc.subjectSea Surface Temperature (sst)en
dc.subjectSeasonal Differencesen
dc.subjectSeasonal Phase Lockingen
dc.subjectTropical Atlanticen
dc.subjectTropical Oceanen
dc.subjectAtmospheric Pressureen
dc.subjectEarth Atmosphereen
dc.subjectNickel Compoundsen
dc.subjectSea Levelen
dc.subjectClimate Conditionsen
dc.subjectClimate Variationen
dc.subjectEl Nino-southern Oscillationen
dc.subjectPrecipitation (climatology)en
dc.subjectSea Level Pressureen
dc.subjectSea Surface Temperatureen
dc.subjectSeasonal Variationen
dc.subjectTemperature Anomalyen
dc.subjectTemperature Gradienten
dc.subjectAtlantic Oceanen
dc.subjectAtlantic Ocean (tropical)en
dc.subjectPacific Oceanen
dc.subjectPacific Ocean (tropical)en
dc.subjectPara [brazil]en
dc.subjectSantarem [para]en
dc.titleSeasonal anomalous rainfall in the central and eastern Amazon and associated anomalous oceanic and atmospheric patternsen
dc.publisher.journalInternational Journal of Climatologypt_BR
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