Dynamics of the South Java Current in the Indo-Australian Basin

Details Dynamics of the South Java Current in the Indo-Australian Basin Dynamics of the South Java Current in the Indo-Australian Basin

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2493s&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 16, p. 2493-2496

Physics

26

Oceanography: General: Diurnal, Seasonal, And Annual Cycles, Oceanography: General: Equatorial Oceanography, Oceanography: Physical: Currents, Oceanography: General: Descriptive And Regional Oceanography

Scientific paper

A year-long deployment of a mooring in the South Java Current (SJC) of Indonesia provides a fascinating insight into this poorly understood, semi-annually reversing boundary current. A striking three-week period of south-eastward flow begins in mid-May 1997. An analytical model directly account for changes in velocity at this time due to the passage of a westerly wind-forced, downwelling Kelvin wave from the equatorial western Indian Ocean. The entire water column is warmed, with a fresh cap overlying salty water, consistent with the Indian Ocean source. Following the wave passage, the SJC is north-westward, and the prevailing south-easterly monsoon winds lead to upwelling of cold, salty water. In early August, the SJC abruptly returns to south-eastward flow, and remains so until November 1997 in the face of steady south-easterly local winds. The anomalous flow direction and cooler water are related to an upwelling Kelvin wave, forced by unseasonal prolonged easterly wind anomalies in the equatorial Indian Ocean. After a small reversal of flow in November 1997, the SJC is south-eastward, as expected during the north-east monsoon. A trend toward increasing salinities in the record is attributed to the increased input of salty Indian Ocean water, enhanced evaporation, and a lack of freshwater advection due to the regionally reduced precipitation during the 1997-98 El Niño.

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