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Please use this identifier to cite or link to this item: http://drs.nio.org/drs/handle/2264/4144

Title: Bio-physical coupling and ocean dynamics in the central equatorial Indian Ocean during 2006 Indian Ocean Dipole
Authors: PrasannaKumar, S.
David, T.D.
Byju, P.
Narvekar, J.
Yoneyama, K.
Nakatani, N.
Ishida, A.
Horii, T.
Masumoto, Y.
Mizuno, K.
Citation: Geophysical Research Letters, vol.39; 2012; 6pp. L14601
Issue Date: 2012
Publisher: American Geophysical Union
Abstract: The 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.
Document type: Journal Article
Copyright: An 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
URI: http://drs.nio.org/drs/handle/2264/4144
Appears in Collections:Physical Sciences

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