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THE INFLUENCE OF WIND WAVE STATE ON SEA SURFACE ROUGHNESS
Author(s): 
Pages: 1255-1262
Year: Issue:  6
Journal: Oceanologia et Limnologia Sinica

Keyword:  wind wave statesea surface roughnesshigh wind speed condition;
Abstract: Wind wave parameters are often used to calculate the sea surface roughness. In a moderate wind speed condition, there is an auto-correlation effect in sea surface roughness parameterization scheme when wind wave state is considered. We developed a dimensionless roughness parameterization scheme in relation to wave slope parameter with observational data, in which the auto-correlation effect can be avoided. In high wind speed however, wave state can still affect sea surface roughness. In the new parameterization scheme in consideration of spray suspension layer at surface, a new sea surface roughness can be used in high-wind speed condition, and parameterized by wave slope parameter too. The theoretical sea surface roughness and observational data agree largely with each other, indicating sensitivity of sea surface roughness to wind wave state. The new scheme can describe momentum flux at air-sea interface more reasonably. We applied the scheme in high wind speed status and integrated it into a wave model, with which typhoon wave generated from hurricane Ivan was modeled. Comparison to buoy data, the modeled significant wave height matched well. Therefore, the new scheme can improve typhoon wave height simulation in a wave model.
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