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Proceedings Paper

Impact of SeaWIFS derived diffuse attenuation coefficients (Kd_490) on the dynamics and thermodynamics of OGCM simulations
Author(s): Neeraj Agarwal; Rashmi Sharma; Vijay K. Agarwal
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Paper Abstract

The realism of the impact of penetrative solar radiation, an effect we refer to as biological heating, on the upper ocean thermodynamics has been studied using an Ocean General Circulation Model (OGCM). Daily fields of winds, air temperature, specific humidity, net long-wave and shortwave radiation from NCEP were used to force the model. In the control run (cntl-R), diffuse attenuation coefficient (Kd) which signifies the visible radiation penetration is parameterized for clear water condition. In the experimental run (exp-R), attenuation coefficient for blue-green wavelength (Kd_490) obtained from SeaWiFS sensor was used to determine the penetrative depth of solar radiation. Use of satellite derived Kd_490 alters the upper ocean thermodynamics quite significantly. Model simulated parameters sea surface temperature (SST), current and mixed layer depth (MLD) were found to be sensitive to the choice of diffuse attenuation coefficients that limit the penetration of solar radiation into the ocean. The SST cools and MLD deepens in clear water regions (large attenuation depths) due to heat penetration in deeper layers, while the surface gets heated and MLD shoals in regions of high turbidity (low attenuation depths) due to heat trapping.

Paper Details

Date Published: 8 December 2006
PDF: 6 pages
Proc. SPIE 6404, Remote Sensing and Modeling of the Atmosphere, Oceans, and Interactions, 64040W (8 December 2006); doi: 10.1117/12.693675
Show Author Affiliations
Neeraj Agarwal, ISRO Space Applications Ctr. (India)
Rashmi Sharma, ISRO Space Applications Ctr. (India)
Vijay K. Agarwal, ISRO Space Applications Ctr. (India)

Published in SPIE Proceedings Vol. 6404:
Remote Sensing and Modeling of the Atmosphere, Oceans, and Interactions
Tiruvalam N. Krishnamurti; B. N. Goswami; Toshiki Iwasaki, Editor(s)

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