利用多源高度计资料提取南海低模态内潮能量

USING MULTISATELLITE ALTIMETRY TO ESTIMATE ENERGY FLUXES IN SOUTH CHINA SEA

吕宋海峡由于剧烈变化的地形成为内潮产生的源地,内潮是海洋混合的重要原因。为了认知南海的内潮能通量分布,对南海的内潮有更好的理解,本文利用21世纪以来发射的多颗高度计卫星:J2、J1T、GFO以及EN,提取了吕宋海峡附近内潮的能通量。研究使用了调和分析和高通滤波等方法来提取第一模态内潮,主要提取K_1,K_2,M_2,N_2,O_1,P_1,Q_1和S_2八个分潮。同时结合WOA数据对能通量进行计算。结果表明,目标区域潮汐以全日分潮为主,所选区域的全日分潮中K_1所占比例最大;半日分潮中M_2分潮最强,而内潮的能通量则是M_2分潮所占最大,在吕宋海峡区域M_2能通量为6.45GW。内潮主要产生在地形变化剧烈的地方,海域的大部分地区内潮能量很小。在吕宋海峡中部,全日分潮能通量要小于南部地区,而半日分潮则有较大值。

The topography of the Luzon Strait varies greatly,resulting in frequent internal tides important for ocean water mixing.We use several satellite altimeters to detect the energy fluxes around the Luzon Strait.It includes J2,J1T, GFO,and EN,which are used in 21^st century.In addition,we use the data from WOA to calculate eight main tide components in the ocean:K1,K2,M2,N2,O1,P1,Q1,and S2,and only for mode-1 part.The results showed in the selected area,diurnal tides are the main part,K1is the largest one.In the semidiurnal tides,M2is the biggest one.However,as for the internal tides,the energy flux of M2 is the biggest one which get to 6.45GW in Luzon Strait.At most places of selected area,the energy flux of internal tides is very small.And the energy fluxes of diurnal tides in the middle part of Luzon Strait are larger than the south part of it.But for the semidiurnal tides,the result is opposite.