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Seasonal variability of upper-layer geostrophic transport in the tropical Indian Ocean during 1992-1996 along TOGA-I XBT tracklines

DRS at CSIR-National Institute of Oceanography

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Title Seasonal variability of upper-layer geostrophic transport in the tropical Indian Ocean during 1992-1996 along TOGA-I XBT tracklines
 
Creator Murty, V.S.N.
Sarma, M.S.S.
Lambata, B.P.
Gopalakrishna, V.V.
Pednekar, S.M.
Rao, A.S.
Luis, A.J.
Kaka, A.R.
Rao, L.V.G.
 
Subject geostrophic transport
geostrophic flow
equatorial circulation
equatorial undercurrents
seasonal variations
 
Description Upper layer (0-400 m) geostrophic volume transport associated with the major current systems of the tropical Indian Ocean along the near-meridional TOGA-India XBT tracklines from Mumbai to Mauritius during 1992-1996 is discussed. The transport of the eastward flowing Indian Monsoon Current (IMC)) varies between 9 and 14 Sv (1 Sv = 10 sup(6) m sup(3) s sup(-1)) during southwest monsoon. The westward flowing North Equatorial Current (NEC) transports about 8 Sv during boreal winter. The westward flowing south equatorial current (SEC) has its lowest transport (10-12 Sv) during austral fall and spring and highest transport (18-21 Sv) during austral winter and summer. The northern boundary of the SEC extends equatorward as far north as for 4-5 degrees S during southwest monsoon from its usual location of 8-10 degrees S. The eastward flowing South Equatorial Counter Current (SECC) exhibits highest transport (37 Sv) during peak austral summer (January) and between 5 and 20 Sv during the rest of the year. In March and May, eastward undercurrents are noticed near the equator. In June and July, the undercurrents are present south of Sri Lanka away from the equator. The equatorial flow in the zonal belts 1-2 degrees N and 1-2 degrees S exhibits westward transport of 6-20 Sv during January-February. This broad westward flow and the SECC constitute an anticlockwise equatorial gyre during boreal winter. In addition to the above current systems, signatures of a warm-core anticyclonic eddy centered at 8 degrees N, 72.5 degrees E and a cold-core cyclonic eddy centered at 10.5 degrees N, 72.5 degrees E are also noticed in February and October, respectively, off the southwest coast of India
 
Date 2009-01-09T09:22:24Z
2009-01-09T09:22:24Z
2000
 
Type Journal Article
 
Identifier Deep-Sea Research (I: Oceanographic Research Papers), Vol.47; 1569-1582p.
http://drs.nio.org/drs/handle/2264/1719
 
Language en
 
Rights Copyright [2000]. 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.
 
Publisher Pergamon