DOI: 10.1016/j.atmosenv.2015.04.070
Scopus记录号: 2-s2.0-84929070279
论文题名: Aviation NOx-induced CH<inf>4</inf> effect: Fixed mixing ratio boundary conditions versus flux boundary conditions
作者: Khodayari A ; , Olsen S ; C ; , Wuebbles D ; J ; , Phoenix D ; B
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 113 起始页码: 135
结束页码: 139
语种: 英语
英文关键词: Aviation NOx emissions
; CH4 lifetime
; Feedbacks
Scopus关键词: Aircraft control
; Aviation
; Boundary conditions
; Climate models
; Feedback
; Methane
; Mixing
; Nitrogen oxides
; Parameterization
; Chemistry-climate models
; Computational expense
; Computational requirements
; Estimation techniques
; Flux boundary conditions
; Lower boundary conditions
; NOx emissions
; Parameterization techniques
; Atmospheric chemistry
; methane
; nitrogen oxide
; atmospheric chemistry
; boundary condition
; climate modeling
; concentration (composition)
; methane
; nitrous oxide
; ozone
; air pollution
; aircraft
; Article
; atmospheric transport
; aviation
; boundary layer
; climate change
; concentration (parameters)
; controlled study
; evaluation study
; global climate
; mathematical model
; measurement accuracy
; ozone layer
; priority journal
; simulation
; steady state
; surface property
; validity
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Atmospheric chemistry-climate models are often used to calculate the effect of aviation NOx emissions on atmospheric ozone (O3 ) and methane (CH4 ). Due to the long (~10 yr) atmospheric lifetime of methane, model simulations must be run for long time periods, typically for more than 40 simulation years, to reach steady-state if using CH4 emission fluxes. Because of the computational expense of such long runs, studies have traditionally used specified CH4 mixing ratio lower boundary conditions (BCs) and then applied a simple parameterization based on the change in CH4 lifetime between the control and NOx-perturbed simulations to estimate the change in CH4 concentration induced by NOx emissions. In this parameterization a feedback factor (typically a value of 1.4) is used to account for the feedback of CH4 concentrations on its lifetime. Modeling studies comparing simulations using CH4 surface fluxes and fixed mixing ratio BCs are used to examine the validity of this parameterization. The latest version of the Community Earth System Model (CESM), with the CAM5 atmospheric model, was used for this study. Aviation NOx emissions for 2006 were obtained from the AEDT (Aviation Environmental Design Tool) global commercial aircraft emissions. Results show a 31.4 ppb change in CH4 concentration when estimated using the parameterization and a 1.4 feedback factor, and a 28.9 ppb change when the concentration was directly calculated in the CH4 flux simulations. The model calculated value for CH4 feedback on its own lifetime agrees well with the 1.4 feedback factor. Systematic comparisons between the separate runs indicated that the parameterization technique overestimates the CH4 concentration by 8.6%. Therefore, it is concluded that the estimation technique is good to within ~10% and decreases the computational requirements in our simulations by nearly a factor of 8. © 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81747
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, United States; Department of Atmospheric Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, United States
Recommended Citation:
Khodayari A,, Olsen S,C,et al. Aviation NOx-induced CH<inf>4</inf> effect: Fixed mixing ratio boundary conditions versus flux boundary conditions[J]. Atmospheric Environment,2015-01-01,113