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Estimating boundary currents from satellite altimetry: A case study for the east coast of India

DRS at CSIR-National Institute of Oceanography

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Title Estimating boundary currents from satellite altimetry: A case study for the east coast of India
 
Creator Durand, F.
Shankar, D.
Birol, F.
Shenoi, S.S.C.
 
Subject boundary currents
coastal currents
geostrophic flow
geostrophy
altimetry
monsoons
 
Description A methodology to derive surface geostrophic current from a newly released altimetric sea-level data set is presented. TOPEX/Poseidon data were first completely reprocessed from Geophysical Data Records using new algorithms accommodating marginal seas and coastal conditions. The methodology applied to the reprocessed data essentially consists of a smoothing of the raw along-track coastal altimetric data at scales at which the geostrophic equilibrium holds. This was reduced to a computational procedure using a set of objective criteria. The method to the East India Coastal Current (EICC) at the western boundary of the Bay of Bengal is applied. This paper first examines the quality of the new data set, which compares well with tide-gauge data; the current we derived is consistent with independent estimates. The methodology reveals the full spectrum of the along-shore current, ranging from intra-seasonal to inter-annual time scales, from the deep ocean to the shelf-break area where the EICC exists. The algorithm can be applied to any coastal region where an order of the Rossby radius can be defined, and it therefore opens up bright prospects for mapping the variability of other boundary-current systems in the world ocean from altimetry.
 
Date 2008-11-26T06:37:23Z
2008-11-26T06:37:23Z
2008
 
Type Journal Article
 
Identifier Journal of Oceanography, Vol.64; 831-845p.
http://drs.nio.org/drs/handle/2264/1507
 
Language en
 
Rights Copyright [2008]. 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 The Oceanographic Society of Japan