DOI: 10.1002/2013JD020193
论文题名: Improved cirrus simulations in a general circulation model using CARMA sectional microphysics
作者: Bardeen C.G. ; Gettelman A. ; Jensen E.J. ; Heymsfield A. ; Conley A.J. ; Delanoë J. ; Deng M. ; Toon O.B.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 20 起始页码: 11679
结束页码: 11697
语种: 英语
英文关键词: CALIPSO
; CARMA
; cirrus
; CloudSat
; microphysics
; tropopause
Scopus关键词: Cams
; Climate models
; Clouds
; Ionosphere
; Melting
; Meteorology
; Ozone
; Physics
; Snow
; Tropics
; Water vapor
; CALIPSO
; CARMA
; cirrus
; CloudSat
; Microphysics
; tropopause
; Ice
; atmospheric convection
; atmospheric modeling
; CALIPSO
; cirrus
; clear sky
; cloud microphysics
; CloudSat
; COSMIC
; general circulation model
; ice
; longwave radiation
; microwave limb sounder
; nucleation
; relative humidity
; tropopause
; water content
; water vapor
英文摘要: We have developed a new cirrus model incorporating sectional ice microphysics from the Community Aerosol and Radiation Model for Atmospheres (CARMA) in the latest version of NCAR's Community Atmosphere Model (CAM5). Comparisons with DARDAR and 2C-ICE show that CAM5/CARMA improves cloud fraction, ice water content, and ice water path compared to the standard CAM5. Prognostic snow in CAM5/CARMA increases overall ice mass and results in a melting layer at ~4 km in the tropics that is largely absent in CAM5. Subgrid scale supersaturation following Wilson and Ballard (1999) improves ice mass and relative humidity. Increased middle and upper tropospheric condensate in CAM5/CARMA requires a reduction in low-level cloud for energy balance, resulting in a 3.1 W m-2 improvement in shortwave cloud forcing and a 3.8 W m-2 improvement in downwelling shortwave flux at the surface compared to CAM5 and Clouds and Earth's Radiant Energy Systems (CERES). Total and clear-sky longwave upwelling flux at the top are improved in CAM5/CARMA by 1.0 and 2.6 W m-2, respectively. CAM has a 2-3 K cold bias at the tropical tropopause mostly from the prescribed ozone file. Correction of the prescribed ozone or nudging the CAM5/CARMA model to GEOS5-DAS meteorology yields tropical tropopause temperatures and water vapor that agree with the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) and the Microwave Limb Sounder (MLS). CAM5 relative humidity appears to be too large resulting in a +1.5 ppmv water vapor bias at the tropical tropopause when using GEOS5-DAS meteorology. In CAM5/CARMA, 75% of the cloud ice mass originates from ice particles detrained from convection compared to 25% from in situ nucleation. Key Points Improved cirrus simulations in CAM compared to DARDAR, 2C-ICE, COSMIC, and MLS Prognostic snow improves simulated IWC and representation of melting layer Simulations indicate 75% of cirrus from detrainment and 25% formed in situ ©2013. American Geophysical Union. All Rights Reserved. 资助项目: NNX09AK71G
; NNX10AO53A
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63199
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: National Center for Atmospheric Research, PO Box 3000, Boulder, CO, 80307-3000, United States; NASA Ames Research Center, Moffett Field CA, United States; LATMOS, UVSQ/CNRS, IPSL, Guyancourt, France; University of Wyoming, Laramie WY, United States; Department of Atmospheric and Oceanic Sciences, Laboratory for Atmospheric and Space Physics, Boulder CO, United States
Recommended Citation:
Bardeen C.G.,Gettelman A.,Jensen E.J.,et al. Improved cirrus simulations in a general circulation model using CARMA sectional microphysics[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(20)