Dependence of sea surface drag coefficient on wind-wave parameters |
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| Authors: | SHI Jian ZHONG Zhong LI Ruijie LI Yan and SHA Wenyu |
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| Institution: | 1.Institute of Meteorology, PLA University of Science and Technology, Nanjing, 211101, China;Key Laboratory of Coastal Disaster and Defence, Ministry of Education, Hohai University, Nanjing, 210098, China2.Institute of Meteorology, PLA University of Science and Technology, Nanjing, 211101, China3.Key Laboratory of Coastal Disaster and Defence, Ministry of Education, Hohai University, Nanjing, 210098, China |
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| Abstract: | The relationships between sea surface roughness z0 and wind-wave parameters are analyzed, and
spurious self-correlations are found in all of the parameterization schemes. Sea surface drag coeffi-
cient CD is fitted by four wind-wave parameters that are wave age, wave steepness, windsea Reynolds
number RB and RH, and the analyzed data are divided into laboratory, field and combined data
sets respectively. Comparison and analysis of dependence of CD on wind-wave parameters show
that RB can fit the CD most appropriately. Wave age and wave steepness are not suitable to fit CD
with a narrow range data set. When the value of wave age has a board range, RH is not suitable
to fit CD either. Three relationships between CD and RB are integrated into the bulk algorithm
COARE to calculate the observational friction velocity, and the results show that the relationship
between CD and RB which is fitted with field data set can describe the momentum transfer in the
open ocean, under low-moderate wind speed condition, most appropriately. |
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| Keywords: | sea surface drag coefficient wind-wave parameter Windsea Reynolds number |
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