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《Chinese Journal of Geophysics》 2019-01
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Impact of surface layer parameterizations on simulated sea breeze precipitation over the Hainan Island

WANG Ying;MIAO JunFeng;Key Laboratory of Meteorological Disaster of Ministry of Education,Nanjing University of Information Science and Technology;  
Sea breeze is a prototypical mesoscale circulation in coastal areas caused by a thermal difference between sea and land during the daytime,the previous studies have shown that the simulation of sea breeze is closely linked to the surface layer parameterization,which calculate the surface fluxes of heat,moisture and momentum and interact with other model physics including cloud,radiation and precipitation processes.The performance of two surface layer parameterization schemes(MM5 scheme and Eta scheme)are discussed using Weather Research and Forecasting Model to determine how the sea breeze precipitation is affected over the Hainan Island.Results show that the sea breeze circulation and precipitation characteristics are sensitive to the choice of surface layer scheme used in WRF model,the most significant difference between two experiments is mainly reflected on the intensity of the sea breeze and precipitation.Compared with MM5 experiment,Eta experiment produced much stronger sea breeze and low-level convergence,and consequentlylead to higher accumulative precipitation,which is reflected by the significantly higher total rain amount,rain cover percentage and maximum rain amount.By analyzing the flux and variable fields in the surface layer,differences in the sensible heat flux(SH)and latent heat flux(LH)over land surface were primarily responsible for the different precipitation amounts and intensity during the daytime in two experiments.The simulated environment at 09∶00 BST in Eta experiment is more conductive to the initiation of convection,and as the thermal turbulent intensity increased gradually in the afternoon,SH and LH increased by 3.57% and 5.65% respectively while the momentum flux decreased by 10.79% when MM5 scheme is replaced with Eta scheme.The higher SH and LH in Eta experiment could lead to comparatively more distinct land-sea temperature difference,and thus result in prosper development of sea breeze and increased low-level instability.Besides,the accumulated instability energy in the warm and wet layer can be more easily triggered with the convergence and strongly ascending motion ahead of the sea breeze front,so the simulated precipitation in Eta scheme is stronger than MM5 scheme.
【Fund】: 国家重点研发计划重点专项项目(2018YFC1506902)资助
【CateGory Index】: P732
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Chinese Journal Full-text Database 10 Hits
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