Open AccessSeasonal Variations of the Seychelles Dome Simulated in the CMIP3 Models
Author(s) -
Takaaki Yokoi,
Tomoki Tozuka,
Toshio Yamagata
Publication year - 2009
Publication title -
journal of physical oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.706
H-Index - 143
eISSN - 1520-0485
pISSN - 0022-3670
DOI - 10.1175/2008jpo3914.1
Subject(s) - monsoon , coupled model intercomparison project , climatology , upwelling , wind stress , monsoon of south asia , environmental science , seasonality , atmospheric sciences , variation (astronomy) , climate model , geology , oceanography , climate change , mathematics , physics , astrophysics , statistics
Using outputs from the “twentieth-century climate in coupled models” (20c3m) control run of the Coupled Model Intercomparison Project, phase 3 (CMIP3), coupled GCMs, the authors have examined how seasonal variations of the Seychelles Dome (SD) are simulated in the southwestern Indian Ocean. The observed SD shows a dominant semiannual signal due to the semiannual variation in the local Ekman upwelling resulting from a combination of two terms related to the wind stress curl and the zonal wind stress. However, all models fail to reproduce this important mechanism. In particular, the latter contribution—that determined by the seasonal variation of the zonal wind stress associated with the Indian monsoon—is not well simulated. Successful models need to reproduce the asymmetric nature of the monsoon: a shorter and stronger summer monsoon and a longer and weaker winter monsoon. Possible remedies for the model bias are also discussed.