globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2016JD025946
论文题名:
Direct atmosphere opacity observations from CALIPSO provide new constraints on cloud-radiation interactions
作者: Guzman R.; Chepfer H.; Noel V.; Vaillant de Guélis T.; Kay J.E.; Raberanto P.; Cesana G.; Vaughan M.A.; Winker D.M.
刊名: Journal of Geophysical Research: Atmospheres
出版年: 2017
卷: 122, 期:2
起始页码: 1066
结束页码: 1085
语种: 英语
英文关键词: CALIPSO ; climate model constraint ; COSP ; GOCCP ; opaque cloud altitude ; opaque cloud cover
Scopus关键词: CALIPSO ; climate modeling ; cloud cover ; cloud radiative forcing ; global climate ; lidar ; longwave radiation ; simulator
英文摘要: The spaceborne lidar CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation) directly measures atmospheric opacity. In 8 years of CALIPSO observations, we find that 69% of vertical profiles penetrate through the complete atmosphere. The remaining 31% do not reach the surface, due to opaque clouds. The global mean altitude of full attenuation of the lidar beam (z_opaque) is 3.2 km, but there are large regional variations in this altitude. Of relevance to cloud-climate studies, the annual zonal mean longwave cloud radiative effect and annual zonal mean z_opaque weighted by opaque cloud cover are highly correlated (0.94). The annual zonal mean shortwave cloud radiative effect and annual zonal mean opaque cloud cover are also correlated (−0.95). The new diagnostics introduced here are implemented within a simulator framework to enable scale-aware and definition-aware evaluation of the LMDZ5B global climate model. The evaluation shows that the model overestimates opaque cloud cover (31% obs. versus 38% model) and z_opaque (3.2 km obs. versus 5.1 km model). In contrast, the model underestimates thin cloud cover (35% obs. versus 14% model). Further assessment shows that reasonable agreement between modeled and observed longwave cloud radiative effects results from compensating errors between insufficient warming by thin clouds and excessive warming due to overestimating both z_opaque and opaque cloud cover. This work shows the power of spaceborne lidar observations to directly constrain cloud-radiation interactions in both observations and models. ©2017. American Geophysical Union. All Rights Reserved.
资助项目: "The authors would like to thank NASA, CNES, Icare, and Climserv for giving access to the CALIOP data. Special thanks are due to Climserv for computing resources which let us perform all the data analysis and to produce this new version of the GOCCP product. This work was supported by CNES and NASA grant 12-CCST10-0095. The GOCCP v3.0 products presented in this article are available online through the GOCCP website (http://climserv.ipsl.polytechnique.fr/cfmip-obs/Calipso_goccp.html). The new diagnostics will be available in COSP V2. Thanks are due to the two anonymous reviewers who helped to significantly improve this manuscript.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62757
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: LMD/IPSL, CNRS, Ecole Polytechnique, Palaiseau, France; LMD/IPSL, Université Pierre et Marie CurieParis, France; LA CNRS, Toulouse, France; CIRES/ATOC, University of Colorado Boulder, Boulder, CO, United States; JPL, California Institute of Technology, Pasadena, CA, United States; NASA Langley Research Center, Hampton, VA, United States

Recommended Citation:
Guzman R.,Chepfer H.,Noel V.,et al. Direct atmosphere opacity observations from CALIPSO provide new constraints on cloud-radiation interactions[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(2)
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