title: [Spectral absorption coefficients of optically active substances in Lake Dianchi].
abstract: A field investigation in Lake Dianchi was carried out in November, 2009, and a dataset including absorption coefficients and concentration of water components was collected. Absorption properties and its spatial distribution of Lake Dianchi have been systematically analyzed, the results show that: (1) Absorption spectral curve of total particles (a(p)) are similar with that of phytoplankton (a(ph)), which indicates that phytoplankton absorption dominates absorption of total suspended particles; (2) Significant relationships are found between a(ph) (440), a(ph) (624), a(ph) (675) and concentration of chla, and cyanophyta dominats the quantity of the algae in water columns; (3) There are more phytoplankton existed in northern lake than other areas because of higher level of eutrophication. Comparing with other water columns, discrepancies mainly appear as below: (1) The mean value of slope of absorption spectral curve of non-algal particles (S(d)) in Lake Dianchi is much bigger than that in other case-II waters; (2) The mean value of slope of absorption spectral curve of chromophoric dissolved organic matter (CDOM) S(g) in Lake Dianchi is much smaller than that in other case-II waters; (3) Specific absorption of phytoplankton (a(ph)*) at 440 nm and 675 nm is at intermediate level, and a(ph)* value is susceptible to different regions, seasons, population structure of phytoplankton and so on.
authors.affiliation: Key Laboratory of Virtual Geographic Environment, Ministry of Education, Nanjing Normal University, Nanjing 210046, China. zhanghong1987@hotmail.com
authors.forename: Hong
authors.initials: H
authors.lastname: Zhang
authors.forename: Jia-Zhu
authors.initials: JZ
authors.lastname: Huang
authors.forename: Yun-Mei
authors.initials: YM
authors.lastname: Li
authors.forename: Heng
authors.initials: H
authors.lastname: Lü
authors.forename: Chuan-Qing
authors.initials: CQ
authors.lastname: Wu
authors.forename: Xin
authors.initials: X
authors.lastname: Jin
authors.forename: Yan-Fei
authors.initials: YF
authors.lastname: Wang
authors.forename: Bin
authors.initials: B
authors.lastname: Yin
mesh_terms: D002681:China; D004784:Environmental Monitoring / Q000379:methods*; D005068:Eutrophication; D005618:Fresh Water / Q000032:analysis*; D010777:Photochemistry; D010839:Phytoplankton / Q000737:chemistry / Q000254:growth & development / Q000378:metabolism*; D013057:Spectrum Analysis; D014876:Water Pollution / Q000032:analysis*