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On the relative influences of different ocean basin sea surface temperature anomalies on southern African rainfall in 20th and 21st century general circulation model simulations
Author(s) -
Lickley Megan,
Solomon Susan
Publication year - 2018
Publication title -
international journal of climatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.58
H-Index - 166
eISSN - 1097-0088
pISSN - 0899-8418
DOI - 10.1002/joc.5691
Subject(s) - climatology , general circulation model , sea surface temperature , indian ocean , el niño southern oscillation , ocean current , environmental science , ocean general circulation model , structural basin , anomaly (physics) , climate change , geology , oceanography , paleontology , physics , condensed matter physics
Southern Africa rainfall (SAR) is generally projected to decrease during the 21st century as a result of climate change, although there is some disagreement regarding the location and magnitude of this reduction in general circulation models (GCMs). Here we examine the robustness of the rainfall response to sea surface temperature (SST) anomalies. Previous work argues that warmer SSTs in the Indian Ocean suppress SAR. Other studies argue that El Niño leads to suppressed SAR. We examine the SAR response to SST anomalies in the Indian Ocean, Atlantic Ocean, and Niño3.4 region both in observations and in two large ensembles of GCMs run over the 20th and 21st century. We find that El Niño–Southern Oscillation (ENSO) SSTs are most correlated with SAR, while correlations between SAR and the Indian Ocean are dominated by their respective responses to ENSO. This relationship appears to persist under a warming background state.