Hydrographic characteristics of the Indian sector of the Southern Ocean
Oceanographic studies in the Indian sector of the Southern Ocean (58-61 degrees S and 30-40 degrees E) carried out during December 1995 and March 1996 indicate a 3-layer structure typical of summer in the oceanic domain south of the Antarctic Polar Front. The upper 300 m water column consists of thr...
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Current Science Association, Bangalore, India
1999
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ftnio:oai:dsr.nio.org:2264/1808 2023-05-15T13:59:28+02:00 Hydrographic characteristics of the Indian sector of the Southern Ocean Shirodkar, P.V. Somayajulu, Y.K. Sarma, Y.V.B. Rathod, V. 1999 http://drs.nio.org/drs/handle/2264/1808 en eng Current Science Association, Bangalore, India Copyright [1999]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository. hydrographic surveys hydrographic sections thermohaline circulation salinity phytoplankton zooplankton deep-water masses Journal Article 1999 ftnio 2012-08-25T20:05:58Z Oceanographic studies in the Indian sector of the Southern Ocean (58-61 degrees S and 30-40 degrees E) carried out during December 1995 and March 1996 indicate a 3-layer structure typical of summer in the oceanic domain south of the Antarctic Polar Front. The upper 300 m water column consists of three distinctive thermohaline characteristics. The surface layer (50 m) of summer surface water formed by seasonal warming with temperatures (0-2 degrees C) and low salinity (less than 33.8 PSU), the intermediate layer (50-150 m) of winter reminiscent water with negative temperatures (0 to 2 degrees C) and moderate salinity (33.8-34.3 PSU) and the deeper layer below 150 m) of Circumpolar Deep Watermass (CDW) with positive temperatures (0-2 degrees C) and higher salinity (34.3-34.8 PSU). The influence of the strong Antarctic Divergence between the east and west drifts is noticed at 61 degrees S, 34 degrees E marked by phytoplankton and zooplankton patches. The dissolved oxygen (DO) shows high concentrations (7.6 to greater than 8.0 ml l sup(-1)) in the upper layer. These higher levels of DO sometimes extend down to the intermediate layer and gradually decrease further downwards. Phytoplankton cell counts remain high (between 1.92 and 22.9 x 10 sup(4) per litre) while zooplankton biomass shows variations from 9.8 to 303.62 ml 100 m sup(-3). A marked drop of both phytoplankton and zooplankton in the region of krill swarm (between 60 degrees 40'-61 degrees 13'S and 33 degrees 34'-34 degrees 14'E), however, indicates active feeding by the latter on the planktonic communities. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean National Institute of Oceanography, India: Digital Repository Service (DRS@nio) Antarctic Southern Ocean The Antarctic Indian |
institution |
Open Polar |
collection |
National Institute of Oceanography, India: Digital Repository Service (DRS@nio) |
op_collection_id |
ftnio |
language |
English |
topic |
hydrographic surveys hydrographic sections thermohaline circulation salinity phytoplankton zooplankton deep-water masses |
spellingShingle |
hydrographic surveys hydrographic sections thermohaline circulation salinity phytoplankton zooplankton deep-water masses Shirodkar, P.V. Somayajulu, Y.K. Sarma, Y.V.B. Rathod, V. Hydrographic characteristics of the Indian sector of the Southern Ocean |
topic_facet |
hydrographic surveys hydrographic sections thermohaline circulation salinity phytoplankton zooplankton deep-water masses |
description |
Oceanographic studies in the Indian sector of the Southern Ocean (58-61 degrees S and 30-40 degrees E) carried out during December 1995 and March 1996 indicate a 3-layer structure typical of summer in the oceanic domain south of the Antarctic Polar Front. The upper 300 m water column consists of three distinctive thermohaline characteristics. The surface layer (50 m) of summer surface water formed by seasonal warming with temperatures (0-2 degrees C) and low salinity (less than 33.8 PSU), the intermediate layer (50-150 m) of winter reminiscent water with negative temperatures (0 to 2 degrees C) and moderate salinity (33.8-34.3 PSU) and the deeper layer below 150 m) of Circumpolar Deep Watermass (CDW) with positive temperatures (0-2 degrees C) and higher salinity (34.3-34.8 PSU). The influence of the strong Antarctic Divergence between the east and west drifts is noticed at 61 degrees S, 34 degrees E marked by phytoplankton and zooplankton patches. The dissolved oxygen (DO) shows high concentrations (7.6 to greater than 8.0 ml l sup(-1)) in the upper layer. These higher levels of DO sometimes extend down to the intermediate layer and gradually decrease further downwards. Phytoplankton cell counts remain high (between 1.92 and 22.9 x 10 sup(4) per litre) while zooplankton biomass shows variations from 9.8 to 303.62 ml 100 m sup(-3). A marked drop of both phytoplankton and zooplankton in the region of krill swarm (between 60 degrees 40'-61 degrees 13'S and 33 degrees 34'-34 degrees 14'E), however, indicates active feeding by the latter on the planktonic communities. |
format |
Article in Journal/Newspaper |
author |
Shirodkar, P.V. Somayajulu, Y.K. Sarma, Y.V.B. Rathod, V. |
author_facet |
Shirodkar, P.V. Somayajulu, Y.K. Sarma, Y.V.B. Rathod, V. |
author_sort |
Shirodkar, P.V. |
title |
Hydrographic characteristics of the Indian sector of the Southern Ocean |
title_short |
Hydrographic characteristics of the Indian sector of the Southern Ocean |
title_full |
Hydrographic characteristics of the Indian sector of the Southern Ocean |
title_fullStr |
Hydrographic characteristics of the Indian sector of the Southern Ocean |
title_full_unstemmed |
Hydrographic characteristics of the Indian sector of the Southern Ocean |
title_sort |
hydrographic characteristics of the indian sector of the southern ocean |
publisher |
Current Science Association, Bangalore, India |
publishDate |
1999 |
url |
http://drs.nio.org/drs/handle/2264/1808 |
geographic |
Antarctic Southern Ocean The Antarctic Indian |
geographic_facet |
Antarctic Southern Ocean The Antarctic Indian |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_rights |
Copyright [1999]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository. |
_version_ |
1766268021685354496 |