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dc.contributor.authorVialard, J.
dc.contributor.authorShenoi, S.S.C.
dc.contributor.authorMcCreary, J.P.
dc.contributor.authorShankar, D.
dc.contributor.authorDurand, F.
dc.contributor.authorFernando, V.
dc.contributor.authorShetye, S.R.
dc.date.accessioned2009-11-17T11:52:00Z
dc.date.available2009-11-17T11:52:00Z
dc.date.issued2009
dc.identifier.citationGeophysical Research Letters, vol.36(14); 2009; doi:10.1029/2009GL038450; 5 pp
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/3449
dc.description.abstractA new observational record of upper-ocean currents at 15 degrees N on the western coast of India is dominated by intraseasonal (55-110 day) variations of alongshore currents, whereas sea level at the same location has a clear seasonal signal. These observations can be interpreted within the framework of linear wave theory. At 15 degrees N, the minimum period for planetary waves is approx. 90 day, meaning that intraseasonal energy is largely trapped at the coast in the form of poleward-propagating Kelvin waves, while lower-frequency signals associated with the annual cycle can radiate offshore as planetary waves. This dynamical difference results in a steeper offshore slope of sea level at intraseasonal timescale, and thus stronger geostrophic alongshore currents. A consequence is that the alongshore currents are in-phase with intraseasonally-filtered sea level near the coast, and a gridded satellite product is shown to reproduce the current variations reasonably well. The intraseasonal current variations along the west coast of India are part of basin-scale sea-level fluctuations of the Northern Indian Ocean equatorial and coastal waveguides. The wind forcing associated with this basin scale circulation closely matches surface wind signals associated with the Madden-Julian Oscillation.
dc.language.isoen
dc.publisherAmerican Geophysical Union
dc.rightsAn edited version of this paper was published by AGU. Copyright [2009] AGU. To view the published open abstract, go to http://dx.doi.org and enter the DOI.
dc.subjectIndian Ocean
dc.subjectcoastal waveguide
dc.subjectKelvin waves
dc.subjectintraseasonal energy
dc.titleIntraseasonal response of the northern Indian Ocean coastal waveguide to the Madden-Julian Oscillation
dc.typeJournal Article


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