中国近海黄色物质吸收光谱经验斜率特征研究

摘要

Colored dissolved organic matter (CDOM) is an important factor that affects the optical properties of Chinese offshore waters. Based on the absorption coefficient data of CDOM from 895 stations surveyed during China’s offshore marine optical investigation, we analyzed the variation characteristics of the spectral exponential slope (Sg) of CDOM. Results show that the range of the spectral exponential slope of CDOM in Chinese offshore waters is from 0.0066 to 0.0284 nm–1. The value of Sg obeys a normal distribution in most of the study areas. The average value of Sg is 0.0142 nm–1 and its standard deviation is 0.0044 nm–1 in the whole study areas. The component of CDOM is influenced by terrigenous sediment and marine sediment in China’s offshore, and the distribution characteristics of Sg vary spatially. Except for the weak negative correlations in two areas, there is no obvious relationship between Sg and ag(440) in most of the Chinese offshore waters surveyed.%黄色物质是中国近海水体光学特性的重要影响因素。基于在中国近海海洋光学调查中获取的895个站位的黄色物质吸收系数数据,对黄色物质吸收光谱经验斜率(Sg)进行了分析,研究表明：1.中国近海 Sg 的范围在0.0066~0.0284nm–1之间,在大部分研究海区Sg呈现正态分布趋势,全海区Sg均值为0.0142nm–1,标准差为0.0044nm–1；2.中国近海黄色物质组分受陆源和海源共同影响,不同海区Sg表现出一定的差异；3. Sg与ag(440)仅在两个海域表现出一定的弱负相关性,在其他绝大部分中国近海海域,两者的相关性较弱。