DOI: 10.1016/j.atmosenv.2014.02.001
Scopus记录号: 2-s2.0-84897626758
论文题名: Development and evaluation of the unified tropospheric-stratospheric chemistry extension (UCX) for the global chemistry-transport model GEOS-Chem
作者: Eastham S ; D ; , Weisenstein D ; K ; , Barrett S ; R ; H
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 89 起始页码: 52
结束页码: 63
语种: 英语
英文关键词: GEOS-Chem
; Model development
; Model validation
; Ozone hole
; Stratospheric chemistry
Scopus关键词: GEOS-Chem
; Model development
; Model validation
; Ozone hole
; Stratospheric chemistry
; Aerosols
; Atmospheric chemistry
; Computer simulation
; Models
; NASA
; Ozone
; Photolysis
; Troposphere
; bromine
; halogen
; nitrogen derivative
; sulfate
; aerosol
; altitude
; atmospheric chemistry
; climatology
; estimation method
; halogen
; ozone
; parameterization
; photolysis
; simulated annealing
; stratosphere
; transport process
; troposphere
; altitude
; article
; atmospheric transport
; cloud
; controlled study
; evaluation study
; evaporation
; latitude
; liquid
; Northern Hemisphere
; ozone depletion
; ozone layer
; photochemistry
; photolysis
; priority journal
; process development
; secondary organic aerosol
; sedimentation
; simulation
; steady state
; stratosphere
; surface property
; troposphere
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: Global chemistry-transport models (CTMs) typically use simplified parameterizations or relaxation to climatology to estimate the chemical behavior of the stratosphere only in the context of its impact on tropospheric chemistry. This limits investigation of stratospheric chemistry and interactions between tropospheric and stratospheric chemistry-transport processes. We incorporate stratospheric chemical and physical processes into the model GEOS-Chem in the form of a unified chemistry extension (UCX). The stratospheric chemistry framework from NASA's Global Modeling Initiative (GMI) is updated in accordance with JPL 10-06 and combined with GEOS-Chem's existing widely applied and validated tropospheric chemistry to form a single, unified gas-phase chemistry scheme. Aerosol calculations are extended to include heterogeneous halogen chemistry and the formation, sedimentation and evaporation of polar stratospheric clouds (PSCs) as well as background liquid binary sulfate (LBS) aerosols. The Fast-JX v7.0a photolysis scheme replaces a hybrid of Fast-J and Fast-JX v6.2, allowing photolytic destruction at frequencies relevant to the stratosphere and of species not previously modeled. Finally, new boundary conditions are implemented to cover both surface emissions of new species and mesospheric behavior. Results for four simulation years (2004-2007) are compared to those from the original, tropospheric model and to in situ and satellite-based measurements. We use these comparisons to show that the extended model is capable of modeling stratospheric chemistry efficiently without compromising the accuracy of the model at lower altitudes, perturbing mean OH below 250hPa by less than 5% while successfully capturing stratospheric behavior not previously captured in GEOS-Chem such as formation and collapse of the Antarctic ozone hole. These extensions (with supporting validation and intercomparison) enable an existing and extensively validated tropospheric CTM to be used to investigate a broader set of atmospheric chemistry problems and leverages GEOS-Chem's existing tropospheric treatment. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80678
Appears in Collections: 气候变化事实与影响
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作者单位: Laboratory for Aviation and the Environment, Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Harvard School of Engineering and Applied Sciences, 29 Oxford Street, Cambridge, MA 02138, United States
Recommended Citation:
Eastham S,D,, Weisenstein D,et al. Development and evaluation of the unified tropospheric-stratospheric chemistry extension (UCX) for the global chemistry-transport model GEOS-Chem[J]. Atmospheric Environment,2014-01-01,89