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

DRS at CSIR-National Institute of Oceanography

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Title Bio-physical coupling and ocean dynamics in the central equatorial Indian Ocean during 2006 Indian Ocean Dipole
 
Creator PrasannaKumar, S.
David, T.D.
Byju, P.
Narvekar, J.
Yoneyama, K.
Nakatani, N.
Ishida, A.
Horii, T.
Masumoto, Y.
Mizuno, K.
 
Subject thermal structure
surface layers
chlorophyll
advection
 
Description 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.
 
Date 2012-09-03T09:05:57Z
2012-09-03T09:05:57Z
2012
 
Type Journal Article
 
Identifier Geophysical Research Letters, vol.39; 2012; 6pp. L14601
no
http://drs.nio.org/drs/handle/2264/4144
 
Language en
 
Relation Geophys_Res_Lett_39_L14601.jpg
 
Rights 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
 
Publisher American Geophysical Union