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Interannual variability of the Equatorial Jets in the Indian Ocean from the merged altimetry data

DRS at CSIR-National Institute of Oceanography

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Title Interannual variability of the Equatorial Jets in the Indian Ocean from the merged altimetry data
 
Creator Somayajulu, Y.K.
Murty, V.S.N.
Neelima, C.
Jagadeesh, P.S.V.
 
Subject Equatorial Indian Ocean
Acoustic Doppler Current Profiler
 
Description The merged ERS-1/2, TOPEX/Poseidon and Jason-1 altimeter weekly sea level anomalies (SLAs) for the period 1997- 2005 were analyzed to study the variability of sea level and computed geostrophic currents in relation to the equatorial jets in the Indian Ocean. Year-to-year-variability in SLA was large (small) at 77°E (93°E) with a pronounced (weaker) semi-annual variation. The computed geostrophic currents, using the second order differential equation, in the equatorial region (2°S-2°N) revealed the existence of spring and fall equatorial jets in each year, but with considerable variation. The 9 year mean (excluding 1997-98) SLA and the derived currents revealed that spring (fall) jet was weak (strong) with higher (lesser) magnitudes of SLA in the eastern basin. The computed surface currents agreed well with the Acoustic Doppler Current Profiler (ADCP) measured currents and OGCM for Earth Simulator (OFES) simulated currents. The interannual variability of the equatorial jets revealed that the fall jet extended for longer duration than the spring jet. The equatorial Kelvin wave with a wavelength of ~1100 km was identified. Westward propagating Rossby wave was identified at 5° N more clearly. The zonal currents at 5° N (south of Sri Lanka) revealed intense anticyclonic (cyclonic) eddy activity between 75° and 80° E during summer (winter) monsoon.
 
Date 2007-03-16T09:10:20Z
2007-03-16T09:10:20Z
2006
 
Type Journal Article
 
Identifier Proceedings of SPIE, vol.6406, 640617
http://drs.nio.org/drs/handle/2264/549
 
Language en
 
Rights Copyright 2006 Society of Photo-Optical Instrumentation Engineers. This paper was (will be) published in [Proc. of SPIE Vol. 6406, 640617] and is made available as an electronic reprint (preprint) with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
 
Format 1064199 bytes
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Publisher Society of Photo-Optical Instrumentation Engineers