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| Titel |
Numerical simulations of spreading of the Persian Gulf outflow into the Oman Sea |
| VerfasserIn |
M. Ezam, A. A. Bidokhti, A. H. Javid |
| 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 ; 6, no. 4 ; Nr. 6, no. 4 (2010-10-11), S.887-900 |
| Datensatznummer |
250003679
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| Publikation (Nr.) |
 copernicus.org/os-6-887-2010.pdf |
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| Zusammenfassung |
| A three dimensional numerical model namely POM (Princeton Ocean Model) and
observational data are used to study the Persian Gulf outflow structure and
its spreading pathways during 1992. In the model, the monthly wind speed
data were taken from ICOADS (International Comprehensive Ocean-Atmosphere
Data Set) and the monthly SST (sea surface temperatures) were taken from
AVHRR (Advanced Very High Resolution Radiometer) with the addition of
monthly net shortwave radiations from NCEP (National Center for
Environmental Prediction). The mean monthly precipitation rates from NCEP
data and the calculated evaporation rates are used to impose the surface
salinity fluxes. At the open boundaries the temperature and salinity were
prescribed from the mean monthly climatological values from WOA05 (World
Ocean Atlas 2005). Also the four major components of the tide were
prescribed at the open boundaries. The results show that the outflow mainly
originates from two branches at different depths in the Persian Gulf. The
permanent branch exists during the whole year deeper than 40 m along the Gulf
axis and originates from the inner parts of the Persian Gulf. The other
seasonal branch forms in the vicinity of the shallow southern coasts due to
high evaporation rates during winter. Near the Strait of Hormuz the two
branches join and form the main outflow source water. The results of
simulations reveal that during the winter the outflow boundary current
mainly detaches from the coast well before Ras Al Hamra Cape, however during
summer the outflow seems to follow the coast even after this Cape. This is
due to a higher density of the colder outflow that leads to more sinking
near the coast in winter. Thus, the outflow moves to a deeper depth of about
500 m (for which some explanations are given) while the main part detaches
and spreads at a depth of about 300 m. However in summer it all moves at a
depth of about 200–250 m. During winter, the deeper, stronger and wider
outflow is more affected by the steep topography, leading to separation from
the coast. While during summer, the weaker and shallower outflow is less
influenced by bottom topography and so continues along the boundary. |
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