Cold filament frontogenesis and frontolysis induced by thermal convection turbulence using large eddy simulation  

作　　者：Zewen Wu Guojing Li Yunkai He Jintuan Zhang 

机构地区：[1]State Key Laboratory of Tropical Oceanography,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China [2]School of Architecture and Electrical Engineering,Hezhou University,Hezhou 542889,China [3]Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519080,China

出　　处：《Acta Oceanologica Sinica》2024年第9期26-34,共9页海洋学报（英文版）

基　　金：The National Key Research and Development Program of China under contract No.2022YFC3103400;the National Natural Science Foundation of China under contract Nos 42076019 and 42076026;the Project supported by Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)under contract No.SML2023SP240.

摘　　要：The frontogenetic processes of a submesoscale cold filament driven by the thermal convection turbulence are studied by a non-hydrostatic large eddy simulation.The results show that the periodic changes in the direction of the cross-filament secondary circulations are induced by the inertial oscillation.The change in the direction of the secondary circulations induces the enhancement and reduction of the horizontal temperature gradient during the former and later inertial period,which indicates that the frontogenetical processes of the cold filament include both of frontogenesis and frontolysis.The structure of the cold filament may be broken and restored by frontogenesis and frontolysis,respectively.The magnitude of the down-filament currents has a periodic variation,while its direction is unchanged with time.The coupling effect of the turbulent mixing and the frontogenesis and frontolysis gradually weakens the temperature gradient of the cold filament with time,which reduces frontogenetical intensity and enlarges the width of cold filament.

关 键 词：cold filament FRONTOGENESIS FRONTOLYSIS thermal convection turbulence large eddy simulation 

分 类 号：P441[天文地球—大气科学及气象学]