globalchange  > 气候变化事实与影响
DOI: 10.1002/gbc.20044
Scopus记录号: 2-s2.0-84878085751
论文题名:
Controls on dissolved organic carbon quantity and chemical character in temperate rivers of North America
作者: Hanley K; W; , Wollheim W; M; , Salisbury J; , Huntington T; , Aiken G
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期:2
起始页码: 492
结束页码: 504
语种: 英语
英文关键词: DOC ; Rivers ; SUVA ; Wetlands
Scopus关键词: Biogeochemical process ; Chemical compositions ; Dissolved organic carbon ; DOC ; Specific ultraviolet absorbance ; SUVA ; Watershed characteristics ; Watershed-scale studies ; Chemical analysis ; Rivers ; Stream flow ; Water quality ; Wetlands ; Process control ; biogeochemistry ; chemical composition ; concentration (composition) ; dissolved organic carbon ; residence time ; resin ; river system ; river water ; temperate environment ; water quality ; watershed ; Colorado River [North America] ; Saint Lawrence River
英文摘要: Understanding the processes controlling the transfer and chemical composition of dissolved organic carbon (DOC) in freshwater systems is crucial to understanding the carbon cycle and the effects of DOC on water quality. Previous studies have identified watershed-scale controls on bulk DOC flux and concentration among small basins but fewer studies have explored controls among large basins or simultaneously considered the chemical composition of DOC. Because the chemical character of DOC drives riverine biogeochemical processes such as metabolism and photodegradation, accounting for chemical character in watershed-scale studies will improve the way bulk DOC variability in rivers is interpreted. We analyzed DOC quantity and chemical character near the mouths of 17 large North American rivers, primarily between 2008 and 2010, and identified watershed characteristics that controlled variability. We quantified DOC chemical character using both specific ultraviolet absorbance at 254 nm (SUVA254) and XAD-resin fractionation. Mean DOC concentration ranged from 2.1 to 47 mg C L-1 and mean SUVA254 ranged from 1.3 to 4.7 L mg C-1 m-1. We found a significant positive correlation between basin wetland cover and both bulk DOC concentration (R 2 = 0.78; p < 0.0001) and SUVA254 (R2 = 0.91; p < 0.0001), while other land use characteristics were not correlated. The strong wetland relationship with bulk DOC concentration is similar to that found by others in small headwater catchments. However, two watersheds with extremely long surface water residence times, the Colorado and St. Lawrence, diverged from this wetland relationship. These results suggest that the role of riverine processes in altering the terrestrial DOC signal at the annual scale was minimal except in river systems with long surface water residence times. However, synoptic DOC sampling of both quantity and character throughout river networks will be needed to more rigorously test this finding. The inclusion of DOC chemical character will be vital to achieving a more complete understanding of bulk DOC dynamics in large river systems. ©2013. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77647
Appears in Collections:气候变化事实与影响

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作者单位: Water Systems Analysis Group, University of New Hampshire, Morse Hall, 8 College Rd., Durham, NH 03824, United States; Department of Natural Resources and Environment, University of New Hampshire, Durham, NH, United States; Ocean Process Analysis Laboratory, University of New Hampshire, Durham, NH, United States; United States Geological Survey, Augusta, ME, United States; United States Geological Survey, Boulder, CO, United States

Recommended Citation:
Hanley K,W,, Wollheim W,et al. Controls on dissolved organic carbon quantity and chemical character in temperate rivers of North America[J]. Global Biogeochemical Cycles,2013-01-01,27(2)
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