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Wave climatology of the Indian Ocean derived from altimetry and wave model

DRS at CSIR-National Institute of Oceanography

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Title Wave climatology of the Indian Ocean derived from altimetry and wave model
 
Creator Vethamony, P.
Rao, L.V.G.
Kumar, R.
Sarkar, A.
Mohan, M.
Sudheesh, K.
Karthikeyan, S.B.
 
Subject wave climate
altimeters
monsoons
wave height
wave period
wave hindcasting
models
 
Description GEOSAT altimeter data for the period 1986-1989 have been utilised to derive wave climatology for the Indian Ocean region bounded by 20 degrees S to 25 degrees N and 40 degrees E to 110 degrees E. The results are presented in the form of mean monthly maps, for three typical months representing calm, SW monsoon and NE monsoon seasons. The corresponding in situ values of significant wave height and wave period are grouped into 1 degrees x 1 degrees grid size and averaged grid-wise for each typical month. Similar procedure is followed for Geosat data for comparison purpose. The wave model, WAVEIN has been run using ECMWF winds to hindcast waves over the Indian Ocean and to compare with Geosat wave parameters. As altimeter does not provide wave direction, the same has been generated from the model results to fill up the gaps.Though the Geosat and model wave heights show good match, this could be further improved by reducing the spatial and temporal ranges. Wave periods computed from the Geosat data are found to be low compared to model values. As expected, central Indian Ocean region is found to have higher waves, generally swells, generated by strong winds prevailing over there in all seasons. In July, the entire Arabian Sea is under the influence of high sea states with wave heights exceeding 5 m. SWHs in the Bay of Bengal are less ( less than 3 m) during NE monsoon compared to SW monsoon (approx. equal to 5 m). `Seas' are dominating the north Indian Ocean during February and the Arabian Sea in November. The satellite derived significant wave heights are extremely valuable to evolve long term distribution for generating wave climatology.
 
Date 2009-01-09T09:19:50Z
2009-01-09T09:19:50Z
2000
 
Type Conference Article
 
Identifier The Fifth Pacific Ocean Remote Sensing Conference (PORSEC), 5-8 December 2000. Proceedings,Vol.1; 301-304p.
http://drs.nio.org/drs/handle/2264/1709
 
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 NIO, Dona Paula, Goa (India)