DOI: 10.1002/2017JG004299
Scopus记录号: 2-s2.0-85041065484
论文题名: On Factors Influencing Air-Water Gas Exchange in Emergent Wetlands
作者: Ho D.T. ; Engel V.C. ; Ferrón S. ; Hickman B. ; Choi J. ; Harvey J.W.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 1 起始页码: 178
结束页码: 192
语种: 英语
Scopus关键词: air-water interaction
; baseline conditions
; gas exchange
; gas transport
; parameterization
; peatland
; subtropical region
; surface water
; thermal convection
; tracer
; velocity
; water flow
; wetland
; wind velocity
; Everglades
; Florida [United States]
; United States
英文摘要: Knowledge of gas exchange in wetlands is important in order to determine fluxes of climatically and biogeochemically important trace gases and to conduct mass balances for metabolism studies. Very few studies have been conducted to quantify gas transfer velocities in wetlands, and many wind speed/gas exchange parameterizations used in oceanographic or limnological settings are inappropriate under conditions found in wetlands. Here six measurements of gas transfer velocities are made with SF6 tracer release experiments in three different years in the Everglades, a subtropical peatland with surface water flowing through emergent vegetation. The experiments were conducted under different flow conditions and with different amounts of emergent vegetation to determine the influence of wind, rain, water flow, waterside thermal convection, and vegetation on air-water gas exchange in wetlands. Measured gas transfer velocities under the different conditions ranged from 1.1 cm h−1 during baseline conditions to 3.2 cm h−1 when rain and water flow rates were high. Commonly used wind speed/gas exchange relationships would overestimate the gas transfer velocity by a factor of 1.2 to 6.8. Gas exchange due to thermal convection was relatively constant and accounted for 14 to 51% of the total measured gas exchange. Differences in rain and water flow among the different years were responsible for the variability in gas exchange, with flow accounting for 37 to 77% of the gas exchange, and rain responsible for up to 40%. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114865
Appears in Collections: 气候减缓与适应
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作者单位: Department of Oceanography, University of Hawaii, Honolulu, HI, United States; U.S. Forest Service, Fort Collins, CO, United States; U.S. Geological Survey, Reston, VA, United States
Recommended Citation:
Ho D.T.,Engel V.C.,Ferrón S.,et al. On Factors Influencing Air-Water Gas Exchange in Emergent Wetlands[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(1)