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    Bio-physical coupling and ocean dynamics in the central equatorial Indian Ocean during 2006 Indian Ocean Dipole

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    Geophys_Res_Lett_39_L14601a.pdf (781.1Kb)
    Date
    2012
    Author
    PrasannaKumar, S.
    David, T.D.
    Byju, P.
    Narvekar, J.
    Yoneyama, K.
    Nakatani, N.
    Ishida, A.
    Horii, T.
    Masumoto, Y.
    Mizuno, K.
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    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.
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    http://drs.nio.org/drs/handle/2264/4144
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