DOI: 10.1029/2017JG004209
Scopus记录号: 2-s2.0-85052475574
论文题名: Effects of Wind and Buoyancy on Carbon Dioxide Distribution and Air-Water Flux of a Stratified Temperate Lake
作者: Czikowsky M.J. ; MacIntyre S. ; Tedford E.W. ; Vidal J. ; Miller S.D.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 8 起始页码: 2305
结束页码: 2322
语种: 英语
英文关键词: CO2 flux
; eddy covariance
; lake-atmosphere interaction
; micrometeorology
; pCO2
英文摘要: Improved calculations of emissions of greenhouse gases from stratified lakes require understanding the physical processes controlling transport of dissolved gases to the air-water interface on diel, synoptic, and seasonal time scales. We address this issue during the transition from late summer to autumn cooling in a small temperate lake by combining micrometeorology, physical limnology, and carbon dioxide (CO2) measurements throughout the water column. Over the 26-day campaign, the lake cooled and emitted CO2 with daily average loss of 23 mmol CO2 m−2 d−1. Over diel cycles, lake surface pCO2 decreased during daytime heating and increased during nighttime cooling, while daytime CO2 fluxes exceeded nighttime fluxes by 35% due to higher daytime wind speeds. We compared the effects of diel and synoptic weather patterns on the CO2 distribution within the lake and lake-atmosphere CO2 flux. Increases in near-surface pCO2 scaled with stratification and heat loss which moderated transport of dissolved gases into the mixed layer. When winds were above ~4 m s−1, lake-scale circulations drove upwelling and downwelling that redistributed heat and carbon dioxide between the northeast and southwest basins. Short-burst peak CO2 fluxes exceeded 50 mmol m−2 d−1 during windy periods associated with storms. However, the seasonal cooling-induced transition to persistent deep mixing led to the highest CO2 concentrations in the mixed layer and at the surface and the highest sustained CO2 fluxes (approaching 100 mmol m−2 d−1). ©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/113430
Appears in Collections: 气候减缓与适应
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作者单位: Atmospheric Sciences Research Center, University at Albany, State University of New York, Albany, NY, United States; Earth Research Institute, University of California, Santa Barbara, CA, United States; Department of Ecology, Evolution, and Marine Biology, University of California, Santa Barbara, CA, United States
Recommended Citation:
Czikowsky M.J.,MacIntyre S.,Tedford E.W.,et al. Effects of Wind and Buoyancy on Carbon Dioxide Distribution and Air-Water Flux of a Stratified Temperate Lake[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(8)