Effect of Salinity on Estimating Geostrophic Transport of the Indonesian Throughflow along the IX1 XBT Section
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Geostrophic transport of the Indonesian Throughflow (ITF) is estimated from optimally-interpolated temperature data along a frequently repeated expendable bathythermograph (XBT) section between Fremantle, Australia and Sunda Strait, Indonesia and from two historical temperature-salinity (T/S) relationship products, CSIRO Atlas for Regional Seas (CARS) and Levitus (1982). The annual mean ITF geostrophic transport relative to 400 m during 1984–2001 is estimated to be 4.6 Sv using the CARS T/S relationship, which is about 20% higher than that found using the Levitus T/S relationship. This transport increment is due to the fact that the CARS T/S relationship, which incorporates more recent hydrographic data, better resolves the low-salinity signature of the ITF water. Isothermal averaging in the CARS T/S relationship may also improve representations of the water mass signatures in deep layers.
KeywordsIndonesian Throughflow geostrophic transport T/S relationship XBT data heat transport
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