DOI: 10.1002/2015GL067599
论文题名: Basin scale controls on CO2 and CH4 emissions from the Upper Mississippi River
作者: Crawford J.T. ; Loken L.C. ; Stanley E.H. ; Stets E.G. ; Dornblaser M.M. ; Striegl R.G.
刊名: Geophysical Research Letters
ISSN: 0094-9275
EISSN: 1944-9006
出版年: 2016
卷: 43, 期: 5 起始页码: 1973
结束页码: 1979
语种: 英语
英文关键词: carbon dioxide
; dams
; eutrophication
; methane
; rivers
Scopus关键词: Agriculture
; Carbon dioxide
; Dams
; Eutrophication
; Gas emissions
; Greenhouse gases
; Methane
; Nutrients
; Phytoplankton
; River pollution
; Sediments
; Suspended sediments
; Water quality
; Atmospheric equilibrium
; Carbon oxidation
; Methane emissions
; Primary productivity
; Spatially resolved
; Suspended sediment loads
; Upper Mississippi
; Water quality sensors
; Rivers
; anoxic conditions
; biogeochemistry
; carbon dioxide
; dam
; eutrophication
; greenhouse gas
; methane
; nutrient dynamics
; organic matter
; oxidation
; primary production
; suspended load
; Lake Pepin
; Mississippi River
; United States
英文摘要: The Upper Mississippi River, engineered for river navigation in the 1930s, includes a series of low-head dams and navigation pools receiving elevated sediment and nutrient loads from the mostly agricultural basin. Using high-resolution, spatially resolved water quality sensor measurements along 1385 river kilometers, we show that primary productivity and organic matter accumulation affect river carbon dioxide and methane emissions to the atmosphere. Phytoplankton drive CO2 to near or below atmospheric equilibrium during the growing season, while anaerobic carbon oxidation supports a large proportion of the CO2 and CH4 production. Reductions of suspended sediment load, absent of dramatic reductions in nutrients, will likely further reduce net CO2 emissions from the river. Large river pools, like Lake Pepin, which removes the majority of upstream sediments, and large agricultural tributaries downstream that deliver significant quantities of sediments and nutrients, are likely to persist as major geographical drivers of greenhouse gas emissions. © Published 2016. This article is a US Government work and is in the public domain in the United States of America. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84977848747&doi=10.1002%2f2015GL067599&partnerID=40&md5=0b5fa68b96404e8c0d5a38849fc87fd9
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10238
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: National Research Program, U.S. Geological Survey, Boulder, Colorado, United States
Recommended Citation:
Crawford J.T.,Loken L.C.,Stanley E.H.,et al. Basin scale controls on CO2 and CH4 emissions from the Upper Mississippi River[J]. Geophysical Research Letters,2016-01-01,43(5).