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| Titel |
On the Indonesian Throughflow in the OCCAM 1/4 degree ocean model |
| VerfasserIn |
U. W. Humphries, D. J. Webb |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 4, no. 3 ; Nr. 4, no. 3 (2008-07-28), S.183-198 |
| Datensatznummer |
250001757
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| Publikation (Nr.) |
 copernicus.org/os-4-183-2008.pdf |
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| Zusammenfassung |
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 Niño 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. On investigation we found that changes in the northern
transports were strongly correlated with changes in the position of currents
in the Celebes Sea and off Halmahera. 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. |
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