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dc.contributor.authorPrasannaKumar, S.
dc.contributor.authorDavid, T.D.
dc.contributor.authorByju, P.
dc.contributor.authorNarvekar, J.
dc.contributor.authorYoneyama, K.
dc.contributor.authorNakatani, N.
dc.contributor.authorIshida, A.
dc.contributor.authorHorii, T.
dc.contributor.authorMasumoto, Y.
dc.contributor.authorMizuno, K.
dc.date.accessioned2012-09-03T09:05:57Z
dc.date.available2012-09-03T09:05:57Z
dc.date.issued2012
dc.identifier.citationGeophysical Research Letters, vol.39; 2012; 6pp. L14601
dc.identifier.otherno
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/4144
dc.description.abstractThe high-frequency times-series data collected during 28th October to 21st November 2006 onboard R/V Mirai provided the first evidence of short-term bio-physical coupling in the central equatorial Indian Ocean (EIO). The predominant feature of the thermal structure was the down-sloping of 28 degrees C-isotherm and up-sloping of 14 degrees C-isotherm indicating deepening of surface-layer and shoaling of lower-thermocline respectively. Concomitant with the deepening of surface-layer, nitracline and subsurface chlorophyll maximum (SCM) also deepened. From the prominent bi-weekly periodicity in the 14 degrees C-isotherm and the upward phase propagation in the meridional current velocity, we infer that shoaling was the response of mixed Rossby-Gravity (MRG) waves. Based on temperature and currents we propose that deepening of surface-layer was caused by the eastward advection of warmer waters associated with the weakening of Indian Ocean Dipole (IOD). This made the upper ocean more nutrient-depleted and biologically less-productive, an indication that the central EIO is returning to its pre-IOD condition.
dc.language.isoen
dc.publisherAmerican Geophysical Union
dc.relation.requiresGeophys_Res_Lett_39_L14601.jpg
dc.rightsAn edited version of this paper was published by AGU. Copyright [2012] AGU. To view the published open abstract, go to http://dx.doi.org/10.1029/2012GL052609
dc.subjectthermal structure
dc.subjectsurface layers
dc.subjectchlorophyll
dc.subjectadvection
dc.titleBio-physical coupling and ocean dynamics in the central equatorial Indian Ocean during 2006 Indian Ocean Dipole
dc.typeJournal Article


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