水体中有色可溶性有机物的测量及其变化  

The Measurement and Changes of Chromophoric Dissolved Organic Matter in Water

作　　者：付宇[1] 韦玉春[1] 周宇[1] 

机构地区：[1]南京师范大学教育部虚拟地理环境重点实验室,江苏南京210046

出　　处：《南京师大学报（自然科学版）》2012年第1期95-103,共9页Journal of Nanjing Normal University(Natural Science Edition)

基　　金：江苏省普通高校自然科学研究计划资助(09KJA420001);国家自然科学基金(40771152)

摘　　要：有色可溶性有机物(CDOM)是水色遥感的重要组分之一,在水生生态系统、光学遥感、有机污染、全球碳循环等方面具有重要的研究意义,这已成为国内外学者研究的热点.本文系统总结了国内外CDOM测量计算的方法、测量中存在的问题、CDOM的时空变化特点及其相关因素,以期为相关的工作提供参考.目前CDOM的常规测量计算方法包括光谱吸收系数和荧光光谱法两种,前者使用355 nm、375 nm、440 nm等波长处的吸收系数来表示CDOM的浓度,后者采用200 nm～435 nm激发波长和250 nm～600 nm发射波长的荧光强度来表示CDOM的浓度.CDOM吸收系数在不同时间段、不同区域、不同深度或不同类型水体中均存在差异,且其值大小与盐度、叶绿素a浓度、DOC、悬浮泥沙浓度等因素存在一定的相关性.Chromophoric dissolved organic matter（CDOM） is one of the major constituents in water color remote sensing.It is significantly important in the research field such as aquatic ecosystem,optical remote sensing,organic pollution and global carbon circulation,and becoming a hot research topic.This paper systematically summed up the measurement and calculation methods of CDOM,measurement problems,spatial and temporal changes of CDOM and its correlative factors,so as to provide a reference for related work.Presently,routine measurement and calculation methods of CDOM include spectral absorption coefficient and fluorescence spectrum method,CDOM concentration is expressed by absorption coefficient at 355 nm,375 nm or 440 nm in the former,and expressed by fluorescence intensity at excitation wavelength between 200 nm and 435 nm,and emission wavelength between 250 nm and 600 nm in the latter.CDOM absorption coefficient in water varying with time,region,depth or water body type,and its value is correlated with factors such as salinity,chlorophylla concentration,DOM（dissolved organic matter）,suspended sediment concentration and others.

关 键 词：有色可溶性有机物 吸光度 水色 碳循环 

分 类 号：X832[环境科学与工程—环境工程]