Please use this identifier to cite or link to this item:
Full metadata record
DC FieldValueLanguage
dc.contributor.authorSatyamurty, Prakki-
dc.contributor.authorCosta, Cláudia Priscila Wanzeler da-
dc.contributor.authorManzi, Antônio Ocimar-
dc.description.abstractThe regions where the divergence of vertically integrated water vapor flux, averaged over a season or a year, is positive (negative) are sources (sinks) of moisture for the atmosphere. An aerial river is defined as a stream of strong water vapor flux connecting a source and a sink. Moisture flux, its divergence, and sources and sinks over the tropics of South and Central America and the adjoining Atlantic Ocean are obtained for dry years and for wet years in the Amazon Basin. Results show that the Amazon Basin is a sink region for atmospheric moisture in all seasons and that there are two source regions for the moisture in the basin, one situated in the South Atlantic and the other in the North Atlantic, both located equator-ward of the respective subtropical high-pressure centers. The convergence of moisture increases over the Amazon Basin in austral summer, and at the same time it decreases in the Pacific and Atlantic ITCZs. Box model calculations reveal that the wet years, on the average, present about 55 % more moisture convergence than the dry years in the Amazon Basin. A reduction in the moisture inflow across the eastern and northern boundaries of the basin (at 45°W and at the Equator, respectively) and an increase in the outflow across the southern boundary (at 15°S) lead to dry conditions. The annual mean contribution of moisture convergence to the precipitation over the Amazon Basin is estimated to be 70 %. In the dry years, it lowers to around 50 %. The net convergence of water vapor flux over the basin is a good indicator of the wet or dry condition. © 2012 Springer-Verlag.en
dc.relation.ispartofVolume 111, Número 1-2, Pags. 195-209pt_BR
dc.subjectHigh Pressureen
dc.subjectIntertropical Convergence Zoneen
dc.subjectNumerical Modelen
dc.subjectPrecipitation (climatology)en
dc.subjectSensitivity Analysisen
dc.subjectSubtropical Regionen
dc.subjectWater Vaporen
dc.subjectAmazon Basinen
dc.subjectAtlantic Oceanen
dc.subjectAtlantic Ocean (north)en
dc.subjectAtlantic Ocean (south)en
dc.titleMoisture source for the Amazon Basin: A study of contrasting yearsen
dc.publisher.journalTheoretical and Applied Climatologypt_BR
Appears in Collections:Artigos

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.