DOI: 10.1016/j.watres.2019.01.012
Scopus记录号: 2-s2.0-85060467830
论文题名: Daily pCO 2 and CO 2 flux variations in a subtropical mesotrophic shallow lake
作者: Yang R. ; Xu Z. ; Liu S. ; Xu Y.J.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 29
结束页码: 38
语种: 英语
英文关键词: Aquatic pCO 2
; Carbon biogeochemistry
; CO 2 flux
; Shallow lakes
; Solar radiation
; Subtropical Louisiana
Scopus关键词: Lakes
; Solar radiation
; Tropics
; Uncertainty analysis
; Aquatic pCO2
; Carbon biogeochemistries
; CO2 fluxes
; Louisiana
; Shallow lakes
; Carbon dioxide
; carbon dioxide
; fresh water
; hexachlorophene
; lake water
; surface water
; biogeochemistry
; carbon balance
; carbon dioxide
; carbon emission
; carbon flux
; lacustrine environment
; mesotrophic environment
; partial pressure
; solar radiation
; subtropical region
; trophic status
; water temperature
; Article
; atmosphere
; carbon balance
; carbon dioxide tension
; carbon dynamics
; environmental factor
; gas diffusion
; lake
; priority journal
; solar radiation
; sunlight
; trophic level
; water quality
; water temperature
; wind speed
; Louisiana
; United States
英文摘要: Carbon dioxide (CO 2 ) emissions from lakes have been proven to be an important component of the continental carbon balance, but most CO 2 evasion estimates ignore daily variability of partial pressure of CO 2 (pCO 2 ). To discern the variability of pCO 2 and its effect on CO 2 outgassing estimations, we conducted in-situ biweekly pCO 2 measurements during daylight from November 2017 to June 2018 at 7:00, 10:00, 14:00, and 17:00 Central Standard Time of the United States (CST) in a subtropical shallow lake in Louisiana, USA. Daytime pCO 2 varied largely from 154 to 1698 μatm with an average of 736 μatm, while daytime CO 2 flux ranged from −43 to 284 mmol m 2 h −1 averaging at 44 mmol m 2 h −1 . Significant decreases in pCO 2 and CO 2 fluxes from mornings to late afternoons were observed throughout the study period. Specifically, in morning hours average pCO 2 and CO 2 fluxes were 940 μatm and 83 mmol m 2 h −1 , respectively, while in afternoon hours average pCO 2 and CO 2 fluxes were only 410 μatm and 6 mmol m 2 h −1 , respectively. Relationships between pCO 2 and ambient factors reveal that solar radiation, lake trophic status and water temperature play a major role in pCO 2 and CO 2 dynamics in lake water. We argue that uncertainties may exist in the current regional and global CO 2 evasion estimates due to this high daily pCO 2 variability. © 2019 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/121995
Appears in Collections: 气候变化事实与影响
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作者单位: School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, United States; College of Landscape Architecture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China; Coastal Studies Institute, Louisiana State University, Baton Rouge, LA 70803, United States
Recommended Citation:
Yang R.,Xu Z.,Liu S.,et al. Daily pCO 2 and CO 2 flux variations in a subtropical mesotrophic shallow lake[J]. Water Research,2019-01-01