论文部分内容阅读
通过测定2009年冬季长江口芦潮港至嵊泗海域表层水中有色可溶性有机物(CDOM)的光谱吸收和溶解有机碳(DOC)的浓度,分析CDOM的吸收系数α(355)和光谱斜率s值的空间分布特征,并探讨其来源及其与DOC的关系。结果表明:CDOM光学属性随盐度逐渐降低,18.96～28.00的盐度范围内,α(355)为0.268 9～1.183 1 m-1,均值为0.824 9 m-1,低于丰水期,与国内外研究相比偏低,表明长江口CDOM受控于陆源径流输入,CDOM浓度可能和长江流域植被覆盖率和以及径流量有关。光谱斜率s值的范围为0.011 3～0.017 4 nm-1,均值为0.015 3 nm-1,略低于丰水期。DOC浓度与盐度的负相关关系(R2=0.882)表明该研究区域的溶解有机质(DOM)输入主要来自陆源,CDOM与DOC的相关关系为CDOMα(355)=0.371DOC+1.012(R2=0.48),表明研究区域内CDOM对DOC具有一定的物源指示意义。
By measuring the spectral absorption and dissolved organic carbon (DOC) concentrations of surface water CDOM from Luchaogang to Shengsi waters in the Yangtze River estuary in 2009, the absorption coefficient α (355) and spectral slope s of CDOM were analyzed Distribution characteristics, and explore their sources and their relationship with the DOC. The results showed that the optical properties of CDOM decreased with salinity, and the α (355) ranged from 0.268 9 to 1.183 1 m-1 with a mean of 0.824 9 m-1 over the salinity range of 18.96-28.00, The comparison of domestic and foreign studies is relatively low, indicating that the CDOM in the Yangtze Estuary is controlled by the input of terrestrial runoff. The concentration of CDOM may be related to the vegetation coverage and runoff in the Yangtze River Basin. The spectral slope, s, ranges from 0.011 3 to 0.017 4 nm-1 with a mean of 0.015 3 nm-1, slightly lower than that of the wet season. The negative correlation between DOC concentration and salinity (R2 = 0.882) indicated that DOM in the study area mainly came from terrestrial sources. The correlation between CDOM and DOC was CDOMα (355) = 0.371DOC + 1.012 (R2 = 0.48) , Indicating that CDOM in the study area has a certain source of indication to DOC.