基于潜标观测的吕宋海峡以东深海海流的低频变异  

Low frequency variation of abyssal current east of the Luzon Strait:Cast study from in situ observation

作　　者：旷芳芳 潘爱军 张俊鹏 黄奖 蔡尚湛 李家军[2] 李墨[2] Kuang Fangfang;Pan Aijun;Zhang Junpeng;Huang Jiang;Cai Shangzhan;Li Jiajun;Li Mo(Third Institute of Oceanography,Ministry of Natural Resources,Xiamen 361005,China;National Ocean Technology Center,Tianjin 300112,China)

机构地区：[1]自然资源部第三海洋研究所,福建厦门361005 [2]国家海洋技术中心,天津300112

出　　处：《海洋学报》2020年第9期1-8,共8页

基　　金：大洋“十三五”环境项目(DY135-E2-3-03,DY135-E2-2-02,DY135-E2-5-01)。

摘　　要：本文利用在菲律宾海布放的一套锚系潜标获取的长时间海流和水温观测数据,分析了吕宋海峡以东的深海海洋环境特征,着重阐释了该海域海流的全水深垂向结构及其低频变化特征。研究表明,表层(100~160 m)平均流向为西偏北,流速约为12.5 cm/s;中层(810 m)的平均流为西向,流速为2.6 cm/s;深层(1550 m和2560 m)的平均流速在1 cm/s以内,近底(4040 m)的流向为较稳定的西南向,流速为2.3 cm/s。上层海流的动能比中层和深层大1~2个量级,总动能、平均动能、涡动动能均在表层最大,中层次之、深层最小,各层次涡动能均大于平均动能。中上层海流的低频变化具有极高的相似性,全年为81~85 d的周期振荡;近底层海流则不同,变化周期约为51 d。In order to investigate long-term variations of deep sea currents and temperature in the east of the Luzon Strait,a submarine mooring system was made at 19.75°N,126.75°E from May 2015 to May 2016 in the Philippine Sea.The vertical distribution of ocean currents and its temporal variation characteristics are analyzed in the paper.Several features show that:(1)In the upper layer(100~160 m),the average current velocity is about 12.5 cm/s with average flow direction oriented northwest;in the middle layer(810 m),the average current velocity is about 2.6 cm/s with flow direction oriented westward;in the deep layer of 1550 m and 2560 m,the average current velocity is small and less than 1 cm/s whereas that in 4040 m is about 2.3 cm/s and oriented southwest.(2)The kinetic energy of the upper layer is one to two orders of magnitude compared with the middle and the deep layers.In the deep layer,the total kinetic energy and average kinetic energy in the 4040 m layer is the largest,with smallest total kinetic energy and eddy kinetic energy in the 2560 m layer,and with smallest averaged kinetic energy and largest eddy kinetic energy in the 1550 m layer.Meanwhile,eddy kinetic energy is larger than averaged kinetic energy in all the layers.(3)The wavelet analysis shows that ocean current exhibits a low-frequency oscillation period of 81~85 d in layers shallower than 2560 m,while the current at 4040 m shows 51 d oscillation period.

关 键 词：全水深 潜标 低频变化 吕宋海峡 菲律宾海 

分 类 号：P731.21[天文地球—海洋科学]