Indonesian through flow and the associated pressure gradient
Article first published online: 20 SEP 2012
Copyright 1987 by the American Geophysical Union.
Journal of Geophysical Research: Oceans (1978–2012)
Volume 92, Issue C12, pages 12941–12946, 15 November 1987
How to Cite
1987), Indonesian through flow and the associated pressure gradient, J. Geophys. Res., 92(C12), 12941–12946, doi:10.1029/JC092iC12p12941.(
- Issue published online: 20 SEP 2012
- Article first published online: 20 SEP 2012
- Manuscript Accepted: 6 AUG 1987
- Manuscript Received: 11 MAY 1987
The flow of water from the western Pacific to the eastern Indian Ocean through the Indonesian archipelago is governed by a strong pressure gradient. Dynamic height computations determine the average sea level difference as 16 cm and show that most of the pressure gradient is contained in the upper 200 m. Sea level data from Davao in the Philippines and from Darwin in Australia are used to determine the annual signal and the interannual variations of the pressure gradient for the years 1966 to 1985. The annual signal has a maximum during the southeast monsoon in July and August and a minimum in January and February. Interannual variations are not related to the Southern Oscillation because sea level is low at both stations during El Niño events, and thus there is little influence on the sea level difference. The mechanism of the through flow is discussed, but a determination of its numerical value will have to await direct measurements. A comparison of the sea level difference with results from a numerical model by Kindle shows satisfactory agreement. It is concluded that the variability of the through flow can be monitored by sea level measurements.