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渤海海域MODIS波段衰减深度研究

, PP. 21-29

Keywords: 衰减深度,MODIS,渤海

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Abstract:

衰减深度是传感器检测到的水体信息的90%的深度,衰减深度越大,传感器检测到的水体信息越多,提取水体信息的精确度越高,同时从衰减深度还可了解传感器获取的水体信息到底来自水下多深的水层。以MODIS数据为数据源,对渤海海域衰减深度进行计算,分析了某一时间渤海海域衰减深度波谱变化和某一波段渤海海域衰减深度季节变化。衰减深度波谱曲线为单峰曲线,不同区域的衰减深度波谱曲线的相似和差异情况与前人根据渤海海域悬浮泥沙含量和光谱情况进行分区的情况较一致,衰减深度最大值具有红移现象(不同区域衰减深度最大值的情况是:渤海西北海岸外区域和渤海海峡区域在波段531nm,渤海中部区域在波段551nm,现黄河口影响区域、老黄河口影响区域、辽东湾西侧区域、辽东湾东侧区域在波段555nm),衰减深度波谱佐证了渤海海域为二类水体;衰减深度在夏季最大,在秋季次之,在春季和冬季在不同区域大小顺序有所不同。不同区域衰减深度由小到大顺序是现黄河口影响区域和辽东湾东侧区域、辽东湾西侧区域、老黄河口影响区域、渤海西北海岸外区域和渤海中部区域、渤海海峡区域(除去412和645nm),其中现黄河口影响区域与辽东湾东侧区域和渤海中部区域与渤海西北海岸外区域的衰减深度的大小顺序在不同季节和不同波段有差异。

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