Open AccessA modeling study of interannual variations of the Seychelles Dome
Author(s) -
Tozuka Tomoki,
Yokoi Takaaki,
Yamagata Toshio
Publication year - 2010
Publication title -
journal of geophysical research: oceans
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2009jc005547
Subject(s) - downwelling , ekman transport , upwelling , indian ocean dipole , rossby wave , oceanography , climatology , ocean general circulation model , geology , dome (geology) , throughflow , boreal , indian ocean , general circulation model , climate change , paleontology , soil science
Interannual variations of the Seychelles Dome (SD) in the southwestern Indian Ocean are investigated using outputs from an ocean general circulation model. The high variability is locked seasonally to boreal winter. The SD becomes anomalously weak (strong) owing to anomalous local Ekman downwelling (upwelling) and arrival of downwelling (upwelling) Rossby waves excited in the southeastern Indian Ocean. In contrast to past studies, the anomalous local Ekman pumping cannot be neglected in discussing the interannual variability of the SD. In addition, the interannual variation of the SD is more closely linked with the Indian Ocean Dipole than El Niño–Southern Oscillation in the Pacific.