摘要
应用紫外和荧光光谱分析2012年秋季中国东海海域中有色溶解有机物（CDOM）的光学特性,探讨了CDOM在表层海水中的含量和分布,光谱斜率Sg值的时空分布及CDOM荧光组成成分。结果表明：调查海域（盐度范围为23.45~34.41）表层水中CDOM的吸收系数a（355）的范围为（0.0230~2.685）/m,平均值为0.421/m,该值低于其它入海口或近海海域值;光谱斜率Sg值的范围为（0.00236~0.0371）/nm,平均值为0.0116/nm,表现出中层最大、底层次之、表层最低的趋势。并采用平行因子分析法（PARAFAC）分析CDOM的荧光光谱,得出CDOM至少有以下4种组分：C1（255/295,520 nm）、C2（305/420 nm）、C3（280/330 nm）及C4（385/470 nm）,其中C3反映出类蛋白质的特性,是海洋生物转化产物;C2、C4受陆源输入的影响,表现出类腐殖质的荧光性质;而C1则受控于浮游植物的生长。
Optical Characteristics of chromophoric dissolved organic matter（ CDOM） were measured by UV- Vis absorption and EEMs spectroscopy during October 2012 in the East China Sea. Distribution and fluorescent composition of CDOM in the surface waters were discussed in the article,as well as the temporal and spatial variation of spectral slope.,as The investigation result showed that,the absorption coefficient of CDOM（ a（ 355）） ranged from 0. 0230 /m to 2. 685 / m with an average of0. 421 / m in surface water（ between the salinity ranged from 23. 45 ~ 34. 41）,which was lower than that of other estuaries and coastal waters. The spectrum slope value ranged from 0. 00236 / nm to0. 0371 / nm within the 300 ~ 500 nm,with an average of 0. 0116 / nm; Spectral slope Sgshowed that is largest in the middle water,second in the bottom and minimum in the surface. The EEMs combined with parallel factor analysis（ PARAFAC） was used to examine the fluorescent components,four fluorescent components were identified respectively,C1（ 255 /295,520 nm） 、C2（ 305 /420 nm） 、C3（ 280 /330 nm） and C4（ 385 /470 nm）. It is proved that C3 is protein- like component,which was the converted product from oceanic organism; C2 and C4 are humic- like component,which were associated with anthropogenic activity; while C1 was control by the production of phytoplankton.
出处
《海洋环境科学》
CAS
CSCD
北大核心
2014年第6期876-883,共8页
Marine Environmental Science
基金
国家自然科学基金重点项目(41030858)
教育部"长江学者"奖励计划项目
山东省"泰山学者"建设工程专项经费项目
