Impact of SeaWIFS derived diffuse attenuation coefficients (Kd_490) on the dynamics and thermodynamics of OGCM simulations

Neeraj Agarwal; Rashmi Sharma; Vijay K. Agarwal

doi:10.1117/12.693675

8 December 2006 Impact of SeaWIFS derived diffuse attenuation coefficients (K_d_490) on the dynamics and thermodynamics of OGCM simulations

Neeraj Agarwal, Rashmi Sharma, Vijay K. Agarwal

Author Affiliations +

Proceedings Volume 6404, Remote Sensing and Modeling of the Atmosphere, Oceans, and Interactions; 64040W (2006) https://doi.org/10.1117/12.693675
Event: SPIE Asia-Pacific Remote Sensing, 2006, Goa, India

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 (K_d) which signifies the visible radiation penetration is parameterized for clear water condition. In the experimental run (exp-R), attenuation coefficient for blue-green wavelength (K_d_490) obtained from SeaWiFS sensor was used to determine the penetrative depth of solar radiation. Use of satellite derived K_d_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.

Citation Download Citation

Neeraj Agarwal, Rashmi Sharma, and Vijay K. Agarwal "Impact of SeaWIFS derived diffuse attenuation coefficients (K_d_490) on the dynamics and thermodynamics of OGCM simulations", Proc. SPIE 6404, Remote Sensing and Modeling of the Atmosphere, Oceans, and Interactions, 64040W (8 December 2006); https://doi.org/10.1117/12.693675

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