Decadal covariability of Atlantic SSTs and western Amazon dry-season hydroclimate in observations and CMIP5 simulations

The unusual severity and return time of the 2005 and 2010 dry‐season droughts in western Amazon is attributed partly to decadal climate fluctuations and a modest drying trend. Decadal variability of western Amazon hydroclimate is highly correlated to the Atlantic sea surface temperature (SST) north‐...

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Bibliographic Details
Published in:Geophysical research letters 2015-08, Vol.42 (16), p.6793-6801
Main Authors: Fernandes, Katia, Giannini, Alessandra, Verchot, Louis, Baethgen, Walter, Pinedo-Vasquez, Miguel
Format: Article
Language:English
Subjects:
Amazon climate
Circulation
Climate
Climate models
CMIP5
Computer simulation
Correlation
decadal variability
Drought
Droughts
Drying
General circulation
General circulation models
Geophysics
Historic
Hydroclimate
Intercomparison
Marine
Mathematical models
Meteorology
Ocean temperature
Phase shift
predictability
Sea surface
Sea surface temperature
Seasons
Surface temperature
Temperature effects
Variability
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Summary:The unusual severity and return time of the 2005 and 2010 dry‐season droughts in western Amazon is attributed partly to decadal climate fluctuations and a modest drying trend. Decadal variability of western Amazon hydroclimate is highly correlated to the Atlantic sea surface temperature (SST) north‐south gradient (NSG). Shifts of dry and wet events frequencies are also related to the NSG phase, with a 66% chance of 3+ years of dry events per decade when NSG > 0 and 19% when NSG 
ISSN:0094-8276
1944-8007
DOI:10.1002/2015GL063911