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| Titel |
Mesoscale variability of water masses in the Arabian Sea as revealed by ARGO floats |
| VerfasserIn |
X. Carton, P. L'Hegaret, R. Baraille |
| 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 ; 8, no. 2 ; Nr. 8, no. 2 (2012-03-30), S.227-248 |
| Datensatznummer |
250005510
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| Publikation (Nr.) |
 copernicus.org/os-8-227-2012.pdf |
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| Zusammenfassung |
By analysing ARGO float data over the last four years, a few aspects
of the mesoscale variability of water masses in the Arabian Sea are
described.
The Red Sea Outflow Water (RSOW) is concentrated in the Southwestern
Gulf of Aden, in particular when a cyclonic gyre predominates in this
region. Salinities of 36.5 and temperatures of 16 °C are found in
this area at depths between 600 and 1000 m. RSOW is more dilute in the
eastern part of the Gulf, where intense and relatively barotropic gyres
mix it with Indian ocean Central Water. RSOW is also detected along the
northeastern coast of Socotra, and fragments of RSOW are found between
one and three degrees of latitude north of this island. In the whole
Gulf of Aden, the correlation between the deep motions of the floats
and the sea-level anomaly measured by altimetry is strong, at regional
scale. The finer scale details of the float trajectories are not sampled
by altimetry and are often related to the anomalous water masses that
the floats encounter.
The Persian Gulf Water (PGW) is found in the float profiles near Ras ash
Sharbatat (near 57° E, 18° N), again with 36.5 in salinity and about
18–19 °C in temperature. These observations were achieved in winter
when the southwestward monsoon currents can advect PGW along the South
Arabian coast. Fragments of PGW were also observed in the Arabian Sea
between 18 and 20° N and 63 and 65° E in summer, showing that
this water mass can escape the Gulf of Oman southeastward, during that
season.
Kinetic energy distributions of floats with respect to distance or
angle share common features between the two regions (Gulf of Aden and
Arabian Sea), in particular peaks at 30, 50 and 150 km scales and along
the axis of monsoon currents. Hydrological measurements by floats are
also influenced by the seasonal variations of PGW and RSOW in these
regions. |
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