Evaluating Parameterizations for Turbulent Fluxes over the Landfast Sea-Ice Surface in Prydz Bay, Antarctica  

作　　者：Fangyuan CHENG Qinghua YANG Changwei LIU Bo HAN Shijie PENG Guanghua HAO 

机构地区：[1]School of Atmospheric Sciences,Sun Yat-sen University,and Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519080,China [2]National Marine Environmental Forecasting Center,Beijing 100081,China

出　　处：《Advances in Atmospheric Sciences》2023年第10期1816-1832,共17页大气科学进展（英文版）

基　　金：supported by the National Key Research and Development Program of China(Grant No.2022YFE0106300);the National Natural Science Foundation of China(Grant Nos.42105072,41941009,41922044);the Guangdong Basic and Applied Basic Research Foundation(Grant Nos.2021A1515012209,2020B1515020025);the China Postdoctoral Science Foundation(Grant Nos.2021M693585);the Norges Forskningsråd(Grant No.328886).

摘　　要：It is crucial to appropriately determine turbulent fluxes in numerical models.Using data collected in East Antarctica from 8 April to 26 November 2016,this study evaluates parameterization schemes for turbulent fluxes over the landfast seaice surface in five numerical models.The Community Noah Land Surface Model with Multi-Parameterizations Options(Noah_mp)best replicates the turbulent momentum flux,while the Beijing Climate System Model(BCC_CSM)produces the optimum sensible and latent heat fluxes.In particular,two critical issues of parameterization schemes,stability functions and roughness lengths,are investigated.Sensitivity tests indicate that roughness lengths play a decisive role in model performance.Based on the observed turbulent fluxes,roughness lengths over the landfast sea-ice surface are calculated.The results,which can provide a basis for setting up model parameters,reveal that the dynamic roughness length(z0m)increases with the increase of frictional velocity(u*)when u*≤0.4 m s^(−1) and fluctuates around 10^(−3 )m when u*>0.4 m s^(−1);thermal roughness length(z0t)is linearly related to the temperature gradient between air and sea-ice surface(ΔT)with a relation of lg(z0t)=−0.29ΔT−3.86;and the mean water vapor roughness length(z0q)in the specific humidity gradient(Δq)range ofΔq≤−0.6 g kg^(−1) is 10^(−6) m,3.5 times smaller than that in the range ofΔq˃−0.6 g kg^(−1).

关 键 词：turbulent fluxes ANTARCTICA landfast sea-ice surface PARAMETERIZATION EVALUATING numerical models 

分 类 号：P731.15[天文地球—海洋科学]