On the parameterization of the roughness length for the air-sea interface in free convection |
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Authors: | Email author" target="_blank">S?A?HsuEmail author |
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Institution: | (1) Coastal Studies Institute and Department of Oceanography & Coastal Sciences, Louisiana State University, 70803 Baton Rouge, Louisiana, USA |
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Abstract: | The roughness length at the air-sea interface during free convection (z0fc) is mainly related to the convective velocity (w*) rather than the friction velocity (u*). The parameterization of z0fc with w
*
2
/g as proposed by Abdella and D Alessio in 2003 is evaluated. It is shown that their proposed formula is consistent with field measurements. In order to avoid self-correlation by using u*, a new parameterization of w* with wind speed (Uz) at height z and stability parameter (z/L, where L is the buoyancy length) is proposed. This new formula for w* is in agreement with an independent field result. |
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Keywords: | air-sea interaction connective velocity free convection friction velocity roughness length |
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