On the parameterization of the roughness length for the air-sea interface in free convection期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

On the parameterization of the roughness length for the air-sea interface in free convection

Authors:	S.?A.?Hsu mailto:sahsu@antares.esl.lsu.edu" title=" sahsu@antares.esl.lsu.edu" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author

Affiliation:	(1) Coastal Studies Institute and Department of Oceanography & Coastal Sciences, Louisiana State University, 70803 Baton Rouge, Louisiana, USA

Abstract:	The roughness length at the air-sea interface during free convection (z_0fc) is mainly related to the convective velocity (w_) rather than the friction velocity (u_). The parameterization of z_0fc with w_²/g as proposed by Abdella and DAlessio 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 (U_z) 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.

Keywords:	air-sea interaction connective velocity free convection friction velocity roughness length
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