Advection and diffusion of Indonesian throughflow water within the Indian Ocean South Equatorial Current

Publication Type  Journal Article
Year of Publication  1997
Authors  Gordon, A. L.; Ma, S. B.; Olson, D. B.; Hacker, P.; Ffield, A.; Talley, L. D.; Wilson, D.; Baringer, M.
Journal Title  Geophysical Research Letters
Volume  24
Issue  21
Pages  2573-2576
Journal Date  Nov 1
ISBN Number  0094-8276
Accession Number  ISI:A1997YE98500010
Key Words  geostrophic transport; thermocline; pacific; seas; circulation; area
Abstract  

Warm, low salinity Pacific water weaves through the Indonesian Seas into the eastern boundary of the Indian Ocean. The Indonesian Throughflow Water (ITW) adds freshwater into the Indian Ocean as it spreads by the advection and diffusion within the Indian Ocean's South Equatorial Current (SEC). The low salinity throughflow trace, centered along 12 degrees S, stretches across the Indian Ocean, separating the monsoon dominated regime of the northern Indian Ocean from the more typical subtropical stratification to the south. ITW is well represented within the SEC thermocline, extending with concentrations above 80% of initial characteristics from the sea surface to 300-m within the eastern half of the Indian Ocean, with 60% concentration reaching well into the western Indian Ocean. The ITW transport within the SEC varies from 4 to 12 x 10(6) m(3)sec(-1), partly in response to variations of the injection rate at the eastern boundary and to the likelihood of a zonally elongated recirculation cell between the Equatorial Counter Current and the SEC within the Indian Ocean. Lateral mixing disperses the ITW plume meridionally with an effective isopycnal mixing coefficient of 1.1 to 1.6 x 10(4) m(2)sec(-1).

Notes  

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