DOI: 10.1002/jgrd.50415
论文题名: Simulation of polar stratospheric clouds in the specified dynamics version of the whole atmosphere community climate model
作者: Wegner T. ; Kinnison D.E. ; Garcia R.R. ; Solomon S.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 10 起始页码: 4991
结束页码: 5002
语种: 英语
英文关键词: climate modeling
; polar ozone
; polar stratospheric clouds
Scopus关键词: Mixtures
; Nitric acid
; Supersaturation
; Water vapor
; Cloud-aerosol lidar with orthogonal polarizations
; Polar ozone
; Polar stratospheric clouds
; Satellite observations
; Supercooled ternary solutions
; Temperature dependent
; Vertical distributions
; Whole atmosphere community climate models
; Climate models
; climate modeling
; gas phase reaction
; lidar
; nitric acid
; polar stratospheric cloud
; polarization
; simulation
; size distribution
; supersaturation
; vertical distribution
; water vapor
; winter
英文摘要: We evaluate the simulation of polar stratospheric clouds (PSCs) in the Specified Dynamics version of the Whole Atmosphere Community Climate Model for the Antarctic winter 2005. In this model, PSCs are assumed to form instantaneously at a prescribed supersaturation, with a prescribed size distribution and number density. We use satellite observations of the Antarctic winter 2005 of nitric acid, water vapor, and PSCs to test and improve this PSC parameterization. Cloud-Aerosol Lidar with Orthogonal Polarization observations since 2006 show that in both hemispheres, the dominant PSC type throughout the entire polar winter is a mixture of Nitric Acid Trihydrate (NAT) and Supercooled Ternary Solutions droplets, but typical assumptions about PSC formation in the model at a given supersaturation do not produce such a population of particles and lead to earlier removal of HNO3 from the gas phase compared to observations. In our new PSC scheme, the formation of mixed PSCs is forced by only allowing a fraction of total available HNO3 to freeze to NAT and the remaining part to form STS. With this approach, a mixture of both is present throughout the winter, in agreement with observations. This approach yields good agreement with observations in terms of temperature-dependent removal of gas-phase HNO3 and irreversible denitrification. In addition to nitric acid containing PSCs, we also investigate ice PSCs. We show that the choice of required saturation ratio of water vapor for ice formation can significantly improve the calculated vertical distribution of water vapor and is required to produce good agreement with observations. Key PointsRemoval of gas-phase HNO3 follows the STS equilibrium functionIce PSCs form at temperatures around the frost pointDenitrification and dehydration are in good agreement with observations ©2013. 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/63780
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Institute of Energy and Climate Research - Stratosphere, Forschungszentrum Juelich, GmbH IEK-7, 52425 Juelich, Germany; Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder CO, United States; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge MA, United States
Recommended Citation:
Wegner T.,Kinnison D.E.,Garcia R.R.,et al. Simulation of polar stratospheric clouds in the specified dynamics version of the whole atmosphere community climate model[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(10)