DOI: 10.1002/2013GL057705
论文题名: Efficient gas exchange between a boreal river and the atmosphere
作者: Huotari J. ; Haapanala S. ; Pumpanen J. ; Vesala T. ; Ojala A.
刊名: Geophysical Research Letters
ISSN: 0094-8391
EISSN: 1944-8122
出版年: 2013
卷: 40, 期: 21 起始页码: 5683
结束页码: 5686
语种: 英语
英文关键词: eddy covariance
; gas transfer velocity
; k600
; river
Scopus关键词: Air water interfaces
; Continuous surface
; Eddy covariance
; Flux measurements
; Gas exchange measurements
; Gas transfer
; Rivers and streams
; Water velocities
; Carbon dioxide
; Estimation
; Gases
; Rivers
; Velocity
; Phase interfaces
; carbon cycle
; carbon emission
; channel morphology
; eddy covariance
; flux measurement
; gas exchange
; numerical model
; uncertainty analysis
; velocity
英文摘要: The largest uncertainties in accurately resolving the role of rivers and streams in carbon cycling stem from difficulties in determining gas exchange between water and the atmosphere. So far, estimates for river-atmosphere gas exchange have lacked direct ecosystem-scale flux measurements not disturbing gas exchange across the air-water interface. We conducted the first direct riverine gas exchange measurements with eddy covariance in tandem with continuous surface water CO2 measurements in a large boreal river for 30 days. Our measured gas transfer velocity was, on average, 20.8 cm h-1, which is clearly higher than the model estimates based on river channel morphology and water velocity, whereas our floating chambers gave comparable values at 17.3 cm h-1. These results demonstrate that present estimates for riverine CO2 emissions are very likely too low. This result is also relevant to any other gases emitted, as their diffusive exchange rates are similarly proportional to gas transfer velocity. ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84887201260&doi=10.1002%2f2013GL057705&partnerID=40&md5=aa71d7062cb213d69f9924a19b7ce80f
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5655
Appears in Collections: 气候减缓与适应
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作者单位: Lammi Biological Station, University of Helsinki, Pääjärventie 320, FI-16900 Lammi, Finland
Recommended Citation:
Huotari J.,Haapanala S.,Pumpanen J.,et al. Efficient gas exchange between a boreal river and the atmosphere[J]. Geophysical Research Letters,2013-01-01,40(21).