黄、东海海洋黄色物质的卫星反演

THE SATELLITE RETRIEVAL OF MARINE YELLOW SUBSTANCE IN YELLOW SEA AND EAST CHINA SEA

在对物理特性分析的基础上,建立了黄、东海海域卫星离水辐射率黄色物质反演模式,并利用2003年4月15日SeaWIFS卫星获得的黄、东海海域离水辐射率(Lw)数据反演给出了黄海中部—东海南部(北起33°52′N,南到22°00′N;西起122°36′E,东止125°28′E)海域的黄色物质分布图。结果分析表明,研究区给出的黄、东海海域黄色物质吸收系数在0.003—0.13m 1范围内,与大西洋北海测得的黄色物质吸收系数比较接近,但明显低于波罗的海和地中海,更低于世界各地沿海海湾。平均而言,比在太平洋点测黄色物质吸收系数值高约80%,达0.09m 1左右。在水平分布上,黄海海域的黄色物质吸收系数明显高于东海海域,沿岸水域明显高于远海水域。受长江水系和黄海环流以及沿岸排污等要素的影响,在长江口以外和黄海中、南部水域及其沿岸附近有明显的高吸收系数值聚集区。同时发现,在黄海西部沿岸,由于有较高反射率的高泥沙含量的影响,对该区黄色物质的反演产生了较大的影响,特别在苏北沿岸和长江口水域尤其如此。而在韩国、日本西海岸、浙江及福建沿岸水域则比较正常的给出了黄色物质的分布。

Based on physical analysis, a model is set up using the SeaWIFS data to retrieve marine yellow substance in the Yellow Sea and East China Sea. The distribution map of yellow substance in the Yellow and East China Sea waters （33°52′—22°00′N; 122°36′—125°28′E） is retrieved and acquired with the water-leaving radiance （Lw） data acquired by SeaWIFS on April 15, 2003. The retrieved result is inspiring, indicating that the absorption coefficients of yellow substance ranges from 0.003m？1 to 0.13m？1, which is about the same as those of the North Sea and Atlantic Ocean, lower than those of the Baltic Sea and Mediterranean, and even lower than those of the gulfs in the world. The average value 0.09m？1 is 80% higher than that measured in the Pacific Ocean. In the horizontal distribution, the coefficients in in-shore waters are clearly higher than those in off-shore waters. Affected jointly by the Yangtze River （or Changjiang in Chinese）, the Yellow Sea current, and the pollutants discharge, the clearly gathering area of high absorption coefficients were formed off the Yangtze River estuary and near the coastal waters of the Yellow Sea and its mid-southern part. The absorption coefficients in the Yellow Sea are clearly higher than those in the East China Sea. For the western part of the Yellow Sea, especially in the coastal waters of the Yellow Sea and the estuary, sand content and the sea surface reflectance are high, which affected largely the yellow substance retrieving. However, the distribution of yellow substance was normal in the coastal zones of Zhejiang and Fujian, and Korea as well.