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On the Indonesian Throughflow in the Occam 1/4 Degree Ocean Model : Volume 4, Issue 2 (21/03/2007)

By Humphries, U. W.

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Book Id: WPLBN0004020996
Format Type: PDF Article :
File Size: Pages 46
Reproduction Date: 2015

Title: On the Indonesian Throughflow in the Occam 1/4 Degree Ocean Model : Volume 4, Issue 2 (21/03/2007)  
Author: Humphries, U. W.
Volume: Vol. 4, Issue 2
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2007
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Webb, D. J., & Humphries, U. W. (2007). On the Indonesian Throughflow in the Occam 1/4 Degree Ocean Model : Volume 4, Issue 2 (21/03/2007). Retrieved from http://www.ebooklibrary.org/


Description
Description: King Monghut's Institute of Technology, Thailand. The Indonesian Throughflow is analysed in two runs of the OCCAM 1/4 degree global ocean model, one using monthly climatological winds and one using ECMWF analysed six-hourly winds for the period 1993 to 1998. The long-term model throughflow agrees with observations and the value predicted by Godfrey's Island Rule. The Island Rule has some skill in predicting the annual signal each year but is poor at predicting year to year and shorter term variations in the total flow especially in El Nino years.

The spectra of transports in individual passages show significant differences between those connecting the region to the Pacific Ocean and those connecting with the Indian Ocean. This implies that different sets of waves are involved in the two regions. Vertical profiles of transport are in reasonable agreement with observations but the model overestimates the near surface transport through the Lombok Strait and the dense overflow from the Pacific through the Lifamatola Strait into the deep Banda Sea. In both cases the crude representation of the passages by the model appears responsible.

In the north the model shows, as expected, that the largest transport is via the Makassar Strait. However this is less than expected and instead there is significant flow via the Halmahera Sea. If Godfrey's Island Rule is correct and the throughflow is forced by the northward flow between Australia and South America, then the Halmahers Sea route should be important. It is the most southerly route around New Guinea to the Indian Ocean and there is no apparent reason why the flow should go further north in order to pass through the Makassar Strait. The model result thus raises the question of why in reality the Makassar Strait route appears to dominate the throughflow.


Summary
On the Indonesian throughflow in the OCCAM 1/4 degree ocean model

Excerpt
Molcard, R., Ilahude, A. G., Fieux, M., Swallow, J. C., and Banjarnahor, J.: Low frequency variability of the currents in Indonesian Channels (Savu-Roti M1 and Roti-Ashmore Reef M2), Deep Sea Res., 41, 1643–1662, 1994.; Murray, S. P. and Arief, D.: Throughflow into the Indian Ocean through the Lombok Strait, January 1985–January 1986. Nature 333, 444–447, 1988.; Murray, S. P., Arief, D., Kindle, J. C., and Hurlburt, H. E.: Characteristics of circulation in an Indonesian Archipelago Strait from hydrography, current measurements and modelling results, in: The Physical Oceanography of Sea Straits, edited by: Pratt, L., Kluwer Academic Publishers, Norwell, MA, pp. 3–23, 1990.; Meyers, G.: Variation of Indonesian throughflow and the El NiÑo-Southern Oscillation, J. Geophys. Res., 101, 12 255–12 263, 1996.; Pacanowski, R. C. and Philander S. G. H.: Parameterization of vertical mixing in numerical models of tropical oceans, J. Phys. Oceanogr., 11, 1443–1051, 1981.; Pirani, A.: Testing Godfrey's Island Rule using the OCCAM model for the calculation of the Indonesian Throughflow. MSc Thesis, University of Southampton, 1999.; Qu, Tangdong: Upper-Layer Circulation in the South China Sea, J. Phys. Oceanogr., 30, 1450–1460, 2000.; Semtner, A. J.: An oceanic general circulation model with bottom topography. Technical Report No. 9, Dept of Meteorology, UCLA, Los Angeles, CA 90095, 1974.; Siefridt, L. and Barnier, B.: Banque de Donnes AVIS Vent/flux: Climatologie des Analyses de Surface du CEPMMT, ORSTOM Report 91 1430 025, Toulouse, 1993.; Susanto, R. D. and Gordon, A. L.: Velocity and transport of the Makassar Strait throughflow, J. Geophys. Res., 110, C01005, doi:10.1029/2004JC002425, 2005.; Thompson, S. R.: Sills of the global ocean: a compilation, Ocean Modelling, 109, 7–9, 1995.; U.S. Naval Oceanographic Office and the U.S. Naval Ocean Research and Development Activity: DBDB5 (Digital Bathymetric Data Base-5 Minute Grid), U.S.N.O.O., Bay St. Louis, 1983.; van Aken, H. M., Punjanan, J., and Saimima, S.: Physical aspects of the flushing of the East Indonesian basins, Netherlands J. Sea Res., 22, 315–339, 1988.; van Aken, H. M., Van Bennekom, A. J., Mook, W. G., and Postma, H.: Application of Munk's abyssal recipes to tracer distributions in the deep waters of the southern Banda basin, Oceanologica Acta, 14(2), 151–162, 1991.; Arakawa, A.: Computational design for long-term numerical integration of the equations of fluid motion: Two-dimensional incompressible flow, J. Comput. Phys., 1, 119–143, 1966.; Arief, D. and Murray S. P: Low-frequency fluctuations in the Indonesian Throughflow through Lombok Strait, J. Geophys. Res., 101(C5), 12 455–12 464, 1996.; Armi, L. and Williams, R.: The hydraulics of a stratified fluid flowing through a contraction, J. Fluid Mech., 251, 355–375, 1993.; Bryan, K.: A numerical method for the study of the circulation of the world ocean, J. Comput. Phys., 4, 347–376, 1969.; Bryden, H. L. and Beal, L. M.: Role of the Agulhas current in Indian ocean circulation and associated heat and freshwater fluxes, Deep-Sea Res., 48, 1821–1845, 2001.; Cox, M. D.: A primitive equation 3-dimensional model of the ocean, Tech.Rep. 1, Geophysical Fluid Dyn. Lab, Natl. Oceanic and Atmos. Admin., Princeton Uni. Press, Princeton, N.J., 1984.; Cresswell, G., Frische, A., Peterson J., and Quadfasel, D.: Circulation in the Timor Sea, J. Geophys. Res., 98, 14 379–14 389, 1993.; Cresswell, G. R. and Luick J. L.: Current measurements in the Halmahera sea, J. Geophys. Res., 106, 13 945–13 951, 2001.; Wajsowicz, R. C.: The circulation of the depth-integrated flow around an island with application to the Indonesian Throughflow, J. Phys. Oceanogr., 23, 1470–1484, 1993.; Wajsowicz, R. C., Gordon, A. L., Ffield, A., and Susanto, R. D.: Estimating Transport

 

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