东海典型水体的黄色物质光谱吸收及分布特征

雷惠; 潘德炉; 陶邦一; 沈亮; 康林冲; 张汉松

东海典型水体的黄色物质光谱吸收及分布特征

1.
浙江大学地球科学系, 浙江, 杭州, 310012;国家海洋局, 第二海洋研究所, 浙江, 杭州, 310012
2.
国家海洋局, 第二海洋研究所, 浙江, 杭州, 310012
3.
国家海洋局, 第二海洋研究所, 浙江, 杭州, 310012;中国科学院上海技术物理研究所, 上海, 200083

基金项目: 国家“八六三”资助项目(2007AA092002);国家海洋局第二海洋研究所基本科研业务费专项资助项目(SZ0819)

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出版历程
- 收稿日期: 2008-07-20
- 修回日期: 2009-01-05

The spectral absorption and distribution characteristics of CDOM in the typical waters of the East China Sea

1.
Zhejiang University, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
3.
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China

摘要

摘要: 水体中的有色可溶性有机物(又称"黄色物质")是遥感监测水质分类的主要参数之一,研究其光谱吸收性质具有重要的实际意义。东海海区受长江冲淡水等陆源输入的影响,水体浑浊,光学性质复杂,以往对该区域CDOM吸收特征的研究相对较少。利用"九○八"我国近海海洋光学调查航次数据,获得了2006-2007年四个季节东海水体样品CDOM的光谱吸收数据,建立了包括杭州湾高浑浊水体、长江冲淡水、外海水体等东海不同水体类型的CDOM光谱模型及其典型波段的吸收系数分布情况。发现近岸受陆源输入影响大的海区其光谱性质与外海有明显区别,主要体现为近岸尤其在杭州湾附近站点短波段吸收系数值非常高,而且随波长增加吸收系数曲线衰减迅速,同时还有一定的季节变化,外海站点短波段吸收值则明显要低。这反映了CDOM的陆源输入特性,愈向外受到海水的混合稀释作用愈显著,验证了CDOM可以作为近岸海水水质监测的重要参数。对该海区内CDOM的实测荧光性质进行了相关分析,结果表明CDOM荧光与吸收系数之间有很好的线性相关关系,可以作为荧光方法遥感监测该海区CDOM的有价值的参考。
- 东海 /
- 黄色物质 /
- 吸收系数 /
- 荧光性质
Abstract: It is very practical to learn the spectral absorption characteristics of chromophoric dissolved organic matter (CDOM) in the seawater which is one of the main parameters for water quality remote sensing monitoring Owing to the Changjiang River input, the seawater of the East China Sea (ECS) has a complex optical environment and thus is relative less there.Based on a large in situ survey organized on the ECS, a dat abase of CDOM spectral absorption was potten covering four seasons, and a spectral model was established including different water types in this region as well as the distribution on typical bands.The result shows that the diverse spectral characteristics between alongshore water influenced by terrigenous input heavily and the water in the open sea, e.g., the absorption coefficient values in the Hangzhou Bay are extremely high on short bands and decay sharply as the wavelength went longer, whereas the values in the open sea are always much lower.The distribution reflected the terrigenous origin characteristics of CDOM and it also had seasonal variations especially on short wavelength.The result validates that CDOM can be used as an important parameter for the nearshore water quality monitoring.A fluorescence measurement of CDOM was done, and a good linear relationship between it and the absorption was given out, which could be a valuable reference.
- East China Sea /
- CDOM /
- absorption coefficient /
- fluorescence characteristics

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