DOI: 10.1016/j.watres.2018.08.007
Scopus记录号: 2-s2.0-85051122638
论文题名: Limitations on using CDOM as a proxy for DOC in temperate lakes
作者: Griffin C.G. ; Finlay J.C. ; Brezonik P.L. ; Olmanson L. ; Hozalski R.M.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 144 起始页码: 719
结束页码: 727
语种: 英语
英文关键词: Aquatic carbon cycle
; Colored dissolved organic matter
; Dissolved organic carbon
; Lakes
Scopus关键词: Biogeochemistry
; Biological materials
; Color
; Dissolution
; Forestry
; Organic carbon
; Regression analysis
; Remote sensing
; Stream flow
; Carbon cycles
; Colored dissolved organic matter
; Dissolved nitrogen
; Dissolved organic carbon
; Dominant contributions
; Multiple regression analysis
; Organic matter compositions
; Specific ultraviolet absorbance
; Lakes
; chlorophyll a
; dissolved organic matter
; organic carbon
; absorption
; carbon cycle
; color
; dissolved organic carbon
; dissolved organic matter
; dissolved organic nitrogen
; ecoregion
; laboratory method
; lake water
; regression analysis
; remote sensing
; ultraviolet radiation
; Article
; biogeographic region
; carbon cycle
; constructed wetland
; correlational study
; human
; lake
; land use
; limit of detection
; multiple regression
; priority journal
; remote sensing
; slope factor
; surface property
; suspended particulate matter
; ultraviolet radiation
; wetland
; Midwest
; United States
英文摘要: Colored dissolved organic matter (CDOM) has been widely studied as part of efforts to improve understanding of the aquatic carbon cycle, by laboratory, in situ, and remote sensing methods. We studied ecoregion-scale differences in CDOM and dissolved organic carbon (DOC) to understand variability in organic matter composition and the use of CDOM as a proxy for DOC. Data from 299 lakes across the U.S. Upper Midwest showed that CDOM, measured as absorptivity at 440 nm (a440), correlated strongly with DOC (R2 = 0.81, n = 412). Colored lakes in the Northern Lakes and Forests (NLF) ecoregion drove this relationship. Lakes in the North Central Hardwood Forests (NCHF) had low color (most had a440 < 3 m−1) and weaker CDOM-DOC relationships (R2 = 0.47). Spectral slopes and specific ultraviolet absorbance (SUVA), indicated relatively low aromaticity and non-terrestrial DOM sources in low color lakes. Multiple regression analyses that included total dissolved nitrogen (TDN) and CDOM, but not chlorophyll a, improved DOC estimates in low color lakes, suggesting a dominant contribution of non-planktonic sources of low color DOM in these lakes. Our results show that CDOM is a reliable, regional proxy for DOC in lakes where forests and wetlands dominate the landscape and the DOM is primarily terrestrial in origin. Mapping of lake DOC at broad spatial scales by satellite-derived CDOM has lower accuracy in low color lakes. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112526
Appears in Collections: 气候减缓与适应
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作者单位: Department of Ecology, Evolution, and Behavior, University of Minnesota, Saint Paul, MN, United States; Department of Civil, Environmental, and Geo-Engineering, University of Minnesota, Minneapolis, MN, United States; Remote Sensing and Geospatial Analysis Laboratory, Department of Forest Resources, University of Minnesota, Saint Paul, MN, United States
Recommended Citation:
Griffin C.G.,Finlay J.C.,Brezonik P.L.,et al. Limitations on using CDOM as a proxy for DOC in temperate lakes[J]. Water Research,2018-01-01,144