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首页> 外文会议>International Workshop on Marine Remote Sensing in Northwest Pacific Region; 20041011-12; Beijing(CN) >Satellite remote sensing of ocean color and SST, and biological implications in the South China Sea
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Satellite remote sensing of ocean color and SST, and biological implications in the South China Sea

机译：卫星遥感的海洋颜色和海温及其在南中国海的生物学意义

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Satellite remote sensing of ocean color and SST has been utilized for research on marine ecology and coastal environmental for many year in the world. Harmful Algal Blooms (HABs) in the southeastern Vietnamese coastal waters have caused large economic losses in aquacultured and wild fisheries in recent years; however, there have been few oceanographic studies on these HAB events. The present study reported an extensive HAB off southeastern Vietnamese waters during late June to July 2002 with in situ observations and analyzed the oceanographic conditions using satellite remote sensing data. The HAB had high Chlorophyll-a (Chl-a) concentrations (up to 4.5 mg m~(-3)), occurring about 200 km off the coast and about 200 km north-east of the Mekong River mouth, for a period of about 6 weeks. The bloom was dominated by the harmful algae haptophyte Phaeocystis cf. globosa, and caused a very significant mortality of aquacultured fishes and other marine life. In the same period, Sea Surface Temperature (SST) imagery showed a coldwater plume extending from the coast to the open sea, and QuikScat data showed strong southwesterly winds blowing parallel with the coastline. The study indicated the HAB was induced and supported by offshore upwelling that bring nutrients from the deep ocean to the surface and from coastal water to the offshore, and the upwelling was driven by strong wind through Ekman transport when winds were parallel with the coastline. Our studies revealed local knowledge that algal blooms were frequent in the southeastern Vietnamese waters, and provided scientific evidence that such blooms may be associated with the upwelling occurrences in this region. It suggested that upwelling events as "source of nutrients were among the most significant nutrient enrichment phenomena, other than eutrophication and river discharge, for inducing HABs in these off-coastal waters. Our studies also demonstrated SeaWiFS images can help in tracing the spatial and temporal progress of HAB events; the combination of remote sensing data of Chl-a, SST and data on winds, together with knowledge of coastal continental shelf bathymetry and in situ observations can be very helpful for understanding the biological oceanography of HABs.
机译：在世界范围内，利用海洋颜色和SST卫星遥感技术进行海洋生态学和沿海环境的研究已有多年历史。近年来，越南东南沿海水域的有害藻华（HABs）在水产养殖和野生渔业中造成了巨大的经济损失。然而，关于这些HAB事件的海洋学研究很少。本研究报告了2002年6月下旬至7月下旬在越南东南水域附近发生的大量HAB，并进行了实地观测，并使用卫星遥感数据分析了海洋状况。 HAB的叶绿素a（Chl-a）浓度较高（高达4.5 mg m〜（-3）），发生在距海岸约200 km，距湄公河口东北约200 km的时间段内。大约6周。水华主要由有害藻类附生植物Phaeocystis cf.提供。球藻，并导致水产养殖鱼类和其他海洋生物的死亡。在同一时期，海面温度（SST）图像显示了一条从海岸延伸到公海的冷水羽流，而QuikScat数据显示，强烈的西南风与海岸线平行。研究表明，HAB受近海上升流的诱导和支持，其将营养物质从深海带到地表，从沿海水带到近海，当风与海岸线平行时，上升流由强风通过埃克曼输运驱动。我们的研究揭示了当地知识，越南东南部水域经常发生藻华，并提供了科学证据表明藻华可能与该地区的上升流有关。这表明上升事件作为“营养源是富营养化和河流排泄以外最重要的营养富集现象之一，是在这些近岸水域诱发HABs的结果。我们的研究还表明，SeaWiFS影像有助于追踪时空分布”。 HAB事件的进展；将Chl-a，SST的遥感数据与风的数据相结合，再加上沿海大陆架测深的知识和原位观测，对了解HAB的生物海洋学非常有帮助。

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