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以2005—2008年4年中南海北部开放航次所获得的水文观测资料为基础,结合卫星高度计遥感资料,采用动力计算方法计算南海18°N断面的经向地转流,并与声学多普勒流速剖面仪(Acoustic Doppler Current Profilers,ADCP)走航观测资料进行对比,进而计算出通过南海18°N断面1000m以浅的各站位以及断面上总的经向地转体积、热、盐输运量。结果表明,2005—2008年南海北部开放航次期间18°N断面上的经向地转流呈相间带状分布,各站位经向地转流流速垂向分布和ADCP观测的大体一致。从卫星高度计获得的海面高度场可知,经向地转流流向的空间变化与海洋中尺度涡旋的活动密切相关。2005—2007年航次期间南海18°N断面上1000m以浅总的经向地转体积、热、盐输运均为南向输运,其3年的平均输运量分别为11.8Sv(1Sv=106m3.s 1)、0.38PW、418.8Gg.s 1;其年际间差别较大,经向地转体积、热、盐输运量均为2005年最大,2006年次之,2007年最小。2008年110°—117°E之间1000m以浅总的海水地转体积、热、盐输运量分别为7.3Sv、0.22PW、259.4Gg.s 1。
Based on the hydrographic data obtained from the open navigation over the northern part of the South China Sea from 2005 to 2008 and the remote sensing data from the satellite altimeters, the meridional diversion at 18 ° N section in the South China Sea is calculated by dynamic calculation and compared with the acoustic Doppler flow rate (ADCP), and then calculated the total meridional volume, heat and salt transport volume at 1000m shallow stations through the 18 ° N section of the South China Sea. The results show that the meridional zonal distribution at 18 ° N section of the northern South China Sea during the open voyage from 2005 to 2008 shows an interband distribution. The vertical distribution of meridional diversion velocities at stations generally agrees well with the ADCP observations. From the sea surface height field obtained from satellite altimeter, we know that the spatial variation of meridional diversion flow is closely related to the activity of mesoscale vortex in the ocean. During the 2005-2007 voyage, the total meridional, meridional and thermo-mechanical transport over 1000 m in the shallow 18 ° N section of the South China Sea are all southward. The average annual transport over the three years is 11.8Sv (1Sv = 106m3 .s 1), 0.38PW and 418.8Gg.s 1, respectively. The inter-annual differences were quite large. The trans-annual volume, heat and salt transport were the largest in 2005, the second in 2006 and the smallest in 2007. The total volume of seawater transfer, heat and salt transport between 1000 ° C and 110 ° -117 ° E in 2008 was 7.3Sv, 0.22PW and 259.4Gg.s 1, respectively.