Influence of ridges on hydrographic parameters in the Southwest Indian Ocean |
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Authors: | N Anilkumar S M Pednekar M Sudhakar |
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Institution: | (1) National Centre for Antarctic and Ocean Research, Headland Sada, Goa, 403804, India |
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Abstract: | The objective of the paper is to use the data collected along two meridional sections (45° E and 57°30′ E) during the austral
summer (January–March) 2004 to understand the influence of seabed topography across the Madagascar and Southwest Indian Ridges
on hydrographic parameters. The study was supplemented by World Ocean Circulation Experiment (WOCE) Conductivity-Temperature-Depth
data collected during February–March 1996 along 30° E, as well as Levitus climatology. A southward shift of 2° latitude (between
45° E and 57°30′ E) was recorded for the two predominant frontal structures, i.e., the Agulhas Return Front and Southern Subtropical
Front, which is attributed to the influence of seabed topography on hydrographic parameters. No significant spatial variation
of these fronts was noted between the 30° E and 45° E meridional sections. Between latitudes 31° S and 42° S, the temperature
and salinity structures show deepening over the ridges. The Antarctic Circumpolar Current core was detected between 40°15′ S
and 43° S. |
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Keywords: | Seabed topography Hydrographic parameters Thermohaline gradients Volume transport Ridges |
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