Upwelling along the coasts of Java and Sumatra sand its relation to ENSO

Publication Type  Journal Article
Year of Publication  2001
Authors  Susanto, R. D.; Gordon, A. L.; Zheng, Q. N.
Journal Title  Geophysical Research Letters
Volume  28
Issue  8
Pages  1599-1602
Journal Date  Apr 15
ISBN Number  0094-8276
Accession Number  ISI:000168066100049
Key Words  tropical indian-ocean; indonesian throughflow; sea-level; dynamics; pacific; variability

Upwelling along the Java-Sumatra Indian Ocean coasts is a response to regional winds associated with the monsoon climate. The upwelling center with low sea surface temperature migrates westward and toward the equator during the southeast monsoon (June to October). The migration path depends on the seasonal evolution of alongshore winds and latitudinal changes in the Coriolis parameter. Upwelling is eventually terminated due to the reversal of winds associated with the onset of the northwest monsoon and impingement of Indian Ocean equatorial Kelvin waves. Significant interannual variability of the Java-Sumatra upwelling is linked to ENSO through the Indonesian throughflow (ITF) and by anomalous easterly wind. During El Nino episodes, the Java-Sumatra upwelling extends in both time (into November) and space (closer to the equator). During El Nino (La Nina), the ITF carries colder (warmer) water shallowing (deepening) thermocline depth and enhancing (reducing) upwelling strength.


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