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Exploring the impacts of the tropical Pacific SST on the precipitation patterns over South America during ENSO periods

Coelho, C.A.S.; Bertacchi Uvo, Cintia LU and Ambrizzi, T. (2002) In Theoretical and Applied Climatology 71(3-4). p.185-197
Abstract
Summary

Previous studies on precipitation over South America that strongly support the existence of links between precipitation and SST anomalies in the Pacific Ocean have identified specific regions where the ENSO signal is particularly stronger. Northeast of Brazil and some parts of southern South America are examples of these regions. However, the same attention was not taken to identify which regions in the Central and East Pacific ocean are better correlated with the South America precipitation during extreme ENSO events, and also which are the transition regions of the precipitation signal over South America during these events.



Coincident periods of ENSO events for both SST over the tropical Pacific ocean... (More)
Summary

Previous studies on precipitation over South America that strongly support the existence of links between precipitation and SST anomalies in the Pacific Ocean have identified specific regions where the ENSO signal is particularly stronger. Northeast of Brazil and some parts of southern South America are examples of these regions. However, the same attention was not taken to identify which regions in the Central and East Pacific ocean are better correlated with the South America precipitation during extreme ENSO events, and also which are the transition regions of the precipitation signal over South America during these events.



Coincident periods of ENSO events for both SST over the tropical Pacific ocean and monthly precipitation sums from many observational stations over South America were selected and analyzed. Two statistical methods were used for the data analysis: Singular Value Decomposition (SVD) and Simple Linear Correlation (SLC). The SVD results for warmer events in the Pacific corroborate previous ones and also clearly identified a transition region between the drier conditions in the Northeast of Brazil and the wetter conditions in the Southeast/South of Brazil. Transition regions were also determined over Peru and central Amazon. The SLC results indicated that the SST anomalies in the tropical east Pacific ocean has the strongest influence in the South American precipitation during El Niño events. During La Niña events the central area of the Pacific, around 180°, has shown a more significant influence. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Theoretical and Applied Climatology
volume
71
issue
3-4
pages
185 - 197
publisher
Springer
external identifiers
  • scopus:0036131001
ISSN
1434-4483
DOI
10.1007/s007040200004
language
English
LU publication?
yes
id
4c5e4eda-61f9-44b3-8942-115ef868750c (old id 915513)
date added to LUP
2008-01-16 04:46:13
date last changed
2017-11-05 04:32:37
@article{4c5e4eda-61f9-44b3-8942-115ef868750c,
  abstract     = {Summary<br/><br>
Previous studies on precipitation over South America that strongly support the existence of links between precipitation and SST anomalies in the Pacific Ocean have identified specific regions where the ENSO signal is particularly stronger. Northeast of Brazil and some parts of southern South America are examples of these regions. However, the same attention was not taken to identify which regions in the Central and East Pacific ocean are better correlated with the South America precipitation during extreme ENSO events, and also which are the transition regions of the precipitation signal over South America during these events.<br/><br>
<br/><br>
Coincident periods of ENSO events for both SST over the tropical Pacific ocean and monthly precipitation sums from many observational stations over South America were selected and analyzed. Two statistical methods were used for the data analysis: Singular Value Decomposition (SVD) and Simple Linear Correlation (SLC). The SVD results for warmer events in the Pacific corroborate previous ones and also clearly identified a transition region between the drier conditions in the Northeast of Brazil and the wetter conditions in the Southeast/South of Brazil. Transition regions were also determined over Peru and central Amazon. The SLC results indicated that the SST anomalies in the tropical east Pacific ocean has the strongest influence in the South American precipitation during El Niño events. During La Niña events the central area of the Pacific, around 180°, has shown a more significant influence.},
  author       = {Coelho, C.A.S. and Bertacchi Uvo, Cintia and Ambrizzi, T.},
  issn         = {1434-4483},
  language     = {eng},
  number       = {3-4},
  pages        = {185--197},
  publisher    = {Springer},
  series       = {Theoretical and Applied Climatology},
  title        = {Exploring the impacts of the tropical Pacific SST on the precipitation patterns over South America during ENSO periods},
  url          = {http://dx.doi.org/10.1007/s007040200004},
  volume       = {71},
  year         = {2002},
}