Effect of varied atmospheric stability on sea surface drag in shallow seas and its impact on wind-wave growth |
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| Authors: | R Rajesh Kumar B Prasad Kumar A N V Satyanarayana D Bala Subrahamanyam A D Rao S K Dube |
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| Institution: | (1) Department of Ocean Engineering and Naval Architecture, Indian Institute of Technology Kharagpur, Kharagpur, 721302, West Bengal, India;(2) Centre for Oceans, Rivers, Atmosphere and Land Sciences, Indian Institute of Technology Kharagpur, Kharagpur, 721302, West Bengal, India;(3) Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram, 695022, Kerala, India;(4) Centre for Atmospheric Sciences, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India |
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| Abstract: | This work reports an efficient bulk formulation of sea surface drag that incorporates effect of dynamic stability under varied
atmospheric forcing. The proposed formulation exhibits a polynomial dependence of wind speed on air–sea temperature difference
based on statistical analysis. Quality checked meteorological and oceanographic data from four shallow water buoys located
off Korean seas having measurements at an interval of every 1 h were used for this study. The analyses of in situ records
for this region suggest stability ranging from highly stable to very unstable conditions. Importance of this proposed formulation
is better reflected during unstable condition where other popular bulk formulations fail. In addition, importance and impact
of such a study on wind-wave growth using the state-of-art wave model was also investigated. Finally, we advocate a new drag
formulation, which accounts for varied atmospheric stability and suggest that this should be considered as an essential pre-requisite
for ocean modeling studies. |
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| Keywords: | Stability Surface drag Wave growth Wind waves Wave model |
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