Teleconnection mechanisms of northeast Brazil droughts: modeling and empirical evidence
Targeted numerical modelling experimaents are conducted to complement the previous empirical diagnostics of circulation mechanisms leading from sea surface temperature (SST) departures in the equatorial Pacific in January to anomalies in the March-April rainy season of Brazil's Nordeste. A weak...
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ftjscielo:oai:scielo:S0102-77862008000200001 2023-05-15T17:28:31+02:00 Teleconnection mechanisms of northeast Brazil droughts: modeling and empirical evidence Kucharski,Fred Polzin,Dierk Hastenrath,Stefan 2008-06-01 text/html http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-77862008000200001 en eng Sociedade Brasileira de Meteorologia Revista Brasileira de Meteorologia v.23 n.2 2008 circulation mechanisms teleconnection numerical modeling equatorial Pacific tropical Atlantic Nordeste rainfall journal article 2008 ftjscielo 2015-10-26T20:17:54Z Targeted numerical modelling experimaents are conducted to complement the previous empirical diagnostics of circulation mechanisms leading from sea surface temperature (SST) departures in the equatorial Pacific in January to anomalies in the March-April rainy season of Brazil's Nordeste. A weak interhemispheric northward directed SST gradient in the Atlantic favors a more southerly position of the hydrostatically controlled low pressure trough, embedded in which is the Intertropical Convergence Zone (ITCZ), which is the main rainbearing system for the Nordeste. In addition, anomalously warm waters in the equatorial Pacific in January tend to be followed by Nordeste drought. The underlying chain of causalities has been explored by empirical diagnostics and numerical modelling. During El Nino years, an upper-tropospheric wave train extends from the equatorial eastern Pacific to the tropical North Atlantic, affecting the patterns of upper-tropospheric topography and divergence, and hence of vertical motion over the Atlantic. This leads to a weaker meridional pressure gradient on the equatorward flank of the North Atlantic subtropical high, weaker North Atlantic tradewinds, an anomalously far northerly ITCZ position and thus Nordeste drought. The previous empirical diagnostics are overall supported by the modelling experiments. Article in Journal/Newspaper North Atlantic SciELO Brazil (Scientific Electronic Library Online) Nordeste ENVELOPE(-66.867,-66.867,-68.167,-68.167) Pacific |
institution |
Open Polar |
collection |
SciELO Brazil (Scientific Electronic Library Online) |
op_collection_id |
ftjscielo |
language |
English |
topic |
circulation mechanisms teleconnection numerical modeling equatorial Pacific tropical Atlantic Nordeste rainfall |
spellingShingle |
circulation mechanisms teleconnection numerical modeling equatorial Pacific tropical Atlantic Nordeste rainfall Kucharski,Fred Polzin,Dierk Hastenrath,Stefan Teleconnection mechanisms of northeast Brazil droughts: modeling and empirical evidence |
topic_facet |
circulation mechanisms teleconnection numerical modeling equatorial Pacific tropical Atlantic Nordeste rainfall |
description |
Targeted numerical modelling experimaents are conducted to complement the previous empirical diagnostics of circulation mechanisms leading from sea surface temperature (SST) departures in the equatorial Pacific in January to anomalies in the March-April rainy season of Brazil's Nordeste. A weak interhemispheric northward directed SST gradient in the Atlantic favors a more southerly position of the hydrostatically controlled low pressure trough, embedded in which is the Intertropical Convergence Zone (ITCZ), which is the main rainbearing system for the Nordeste. In addition, anomalously warm waters in the equatorial Pacific in January tend to be followed by Nordeste drought. The underlying chain of causalities has been explored by empirical diagnostics and numerical modelling. During El Nino years, an upper-tropospheric wave train extends from the equatorial eastern Pacific to the tropical North Atlantic, affecting the patterns of upper-tropospheric topography and divergence, and hence of vertical motion over the Atlantic. This leads to a weaker meridional pressure gradient on the equatorward flank of the North Atlantic subtropical high, weaker North Atlantic tradewinds, an anomalously far northerly ITCZ position and thus Nordeste drought. The previous empirical diagnostics are overall supported by the modelling experiments. |
format |
Article in Journal/Newspaper |
author |
Kucharski,Fred Polzin,Dierk Hastenrath,Stefan |
author_facet |
Kucharski,Fred Polzin,Dierk Hastenrath,Stefan |
author_sort |
Kucharski,Fred |
title |
Teleconnection mechanisms of northeast Brazil droughts: modeling and empirical evidence |
title_short |
Teleconnection mechanisms of northeast Brazil droughts: modeling and empirical evidence |
title_full |
Teleconnection mechanisms of northeast Brazil droughts: modeling and empirical evidence |
title_fullStr |
Teleconnection mechanisms of northeast Brazil droughts: modeling and empirical evidence |
title_full_unstemmed |
Teleconnection mechanisms of northeast Brazil droughts: modeling and empirical evidence |
title_sort |
teleconnection mechanisms of northeast brazil droughts: modeling and empirical evidence |
publisher |
Sociedade Brasileira de Meteorologia |
publishDate |
2008 |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-77862008000200001 |
long_lat |
ENVELOPE(-66.867,-66.867,-68.167,-68.167) |
geographic |
Nordeste Pacific |
geographic_facet |
Nordeste Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Revista Brasileira de Meteorologia v.23 n.2 2008 |
_version_ |
1766121238304915456 |