Volume, heat, and freshwater transports from the South China Sea to Indonesian seas in the boreal winter of 2007-2008

• Published in: Journal of Geophysical Research: Oceans Vol. 115; no. C12
• Main Authors: Fang, Guohong, Susanto, R. Dwi, Wirasantosa, Sugiarta, Qiao, Fangli, Supangat, Agus, Fan, Bin, Wei, Zexun, Sulistiyo, Budi, Li, Shujiang
• Format: Journal Article
• Language: English
• Published: Washington, DC Blackwell Publishing Ltd 01-12-2010; American Geophysical Union
• Subjects: Acoustic Doppler Current Profiler; Bottom casting; Current data; Doppler sonar; Earth sciences; Earth, ocean, space; Exact sciences and technology; Freshwater; Geophysics; Heat; Indonesian seas; Indonesian Throughflow; Inland water environment; Marine; Oceanography; Physical oceanography; Salinity; Sea surface; Seasonal variability; Seasonal variation; Seasonal variations; South China Sea; Straits; Temperature; Transport; transports; Water flow; Water surface slope; Winter; South China Sea; Pacific Ocean; Makassar Strait; West Pacific; Indian Ocean; Indonesian Seas; ocean currents; reversals; salinity; Summer; Water flow; transport; depth; conductivity; Current measurement; Winter; casts; temperature; Boreal; Sea surface slope; fresh water; seasonal variations
• ISSN: 0148-0227; 2169-9275; 2156-2202; 2169-9291
• DOI: 10.1029/2010JC006225

Acoustic Doppler current profiler observations were carried out at two stations along a transect northwest of the Karimata Strait from December 2007 to November 2008. One month and 10 months of full‐depth current data were obtained at the western and eastern stations, respectively. The observations show that the South China Sea (SCS) water flows persistently to the Indonesian seas (ISs) in boreal winter. On the basis of current, temperature, and salinity observations by conductivity‐temperature‐depth casts and bottom‐mounted sensors, the volume, heat, and freshwater transport from the SCS to ISs in the month from 13 January to 12 February 2008 are estimated to be 3.6 ± 0.8 Sv (Sv = 106 m3/s), 0.36 ± 0.08 PW, and 0.14 ± 0.04 Sv, respectively. The corresponding transport‐weighted temperature is 27.99°C. A downward sea surface slope from north to south at the study area in boreal winter is also found. The observations confirm the existence of the SCS branch of the Pacific‐to‐Indian‐Ocean throughflow in boreal winter and the reversal of the Karimata Strait transport in boreal summer. The seasonal variability in the Karimata Strait transport can exceed 5 Sv. It is proposed that the Karimata Strait throughflow plays a double role in the total Indonesian Throughflow transport, which is especially evident in boreal winter. The negative effect of the double role is reducing the Makassar Strait volume and heat transports; the positive effect is that the Karimata Strait throughflow itself can contribute volume and heat transports to the total Indonesian Throughflow.