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首页> 外文期刊>Marine ecology progress series >Offshore phytoplankton biomass increase and its oceanographic causes in the South China Sea
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Offshore phytoplankton biomass increase and its oceanographic causes in the South China Sea

机译：南海近海浮游植物生物量增加及其海洋学成因

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High phytoplankton biomass often occurs in plumes near river mouths or in eutrophic coastal waters for short time periods. However, we observed an increased phytoplankton biomass in a narrow jet-shaped protrusion into the western South China Sea (SCS) using satellite chlorophyll a (chl a) data from the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) and concurrent ship measurements in 1999. In June, regional phytoplankton biomass appeared as a large jet shape extending from the coastal waters of Vietnam eastward towards the SCS, about 200 km northeast of the mouth of the Mekong River; this feature intensified in the form of a large jet or gyre from July to September, decayed in October, and disappeared entirely in November. The gyre was about 400 km in diameter with chl a concentrations from 0.5 to 2 mg m~(-3). Data on sea surface temperature (SST), winds, and sea surface height anomalies indicated a strong offshore upwelling during a period of strong southwesterly winds alongshore. The upwelling coincided with the regional increase in phytoplankton biomass in terms of shape, timing, and location. We observed this phenomenon during every southwesterly monsoon season from 1997 to 2002 using chl a images from 3 satellite ocean color sensors―SeaWiFS, Ocean Color and Temperature Scanner (OCTS), and Ocean Color Imager (OCI)―and it appeared to be related to the cross-shelf upwelling that delivers nutrients to surface waters. The phytoplankton then flowed with a large anticyclonic gyre into the western SCS.
机译：浮游植物的高生物量通常发生在河口附近的羽状流中或富营养化的沿海水域中，时间较短。然而，我们使用来自海景宽视场传感器（SeaWiFS）的卫星叶绿素a（chl a）数据并同时观测到了南中国西部（SCS）狭窄的喷射状突起中浮游植物生物量的增加。 1999年进行了船舶测量。6月，区域性浮游植物生物量呈大喷流状，从越南的沿海水域向南延伸至湄公河口东北约200公里的南海。从7月到9月，这种特征以大型喷气机或回旋的形式加剧，在10月衰减，并在11月完全消失。回旋直径约为400 km，浓度为0.5至2 mg m〜（-3）。有关海表温度（SST），风和海面高度异常的数据表明，在沿海沿西南风期间，海上上升流很强。上升流与浮游植物生物量在形状，时间和位置方面的区域增加相吻合。我们从1997年至2002年的每个西南季风季节，使用来自3个卫星海洋颜色传感器SeaWiFS，海洋颜色和温度扫描仪（OCTS）和海洋颜色成像仪（OCI）的chl a图像，观察到了这一现象，它似乎与跨架上升流，将营养物输送到地表水中。然后，浮游植物以大的反气旋回旋流流入南海西部。

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