DOI: 10.1175/JCLI-D-11-00347.1
Scopus记录号: 2-s2.0-84864242359
论文题名: Evaluation of clouds and precipitation in the ECHAM5 general circulation model using CALIPSO and cloudsat satellite data
作者: Nam C.C.W. ; Quaas J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 14 起始页码: 4975
结束页码: 4992
语种: 英语
Scopus关键词: CALIPSO
; Cloud-aerosol lidar and infrared pathfinder satellite observations
; CloudSat
; Feedback model
; General circulation model
; Global scale
; Hadley circulation
; High altitude
; Ice crystals
; Intercomparisons
; Lidar signals
; Low-level clouds
; Model evaluation
; Radar satellites
; Satellite data
; Satellite observations
; Scattering ratio
; Simulator package
; Vertical distributions
; Climate models
; Clouds
; Ice
; Optical properties
; Optical radar
; Radar simulators
; Satellite simulators
; Scattering
; Precipitation (meteorology)
; CALIPSO
; climate modeling
; cloud classification
; CloudSat
; comparative study
; general circulation model
; Hadley cell
; ice crystal
; lidar
; optical property
; performance assessment
; precipitation (climatology)
; satellite data
英文摘要: Observations from Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) and CloudSat satellites are used to evaluate clouds and precipitation in the ECHAM5 general circulation model. Active lidar and radar instruments on board CALIPSO and CloudSat allow the vertical distribution of clouds and their optical properties to be studied on a global scale. To evaluate the clouds modeled by ECHAM5with CALIPSO and CloudSat, the lidar and radar satellite simulators of the Cloud Feedback Model Intercomparison Project's Observation Simulator Package are used. Comparison of ECHAM5 with CALIPSO and CloudSat found large-scale features resolved by the model, such as the Hadley circulation, are captured well. The lidar simulator demonstrated ECHAM5 overestimates the amount of high-level clouds, particularly optically thin clouds. High-altitude clouds in ECHAM5 consistently produced greater lidar scattering ratios compared with CALIPSO. Consequently, the lidar signal in ECHAM5 frequently attenuated high in the atmosphere. The large scattering ratios were due to an underestimation of effective ice crystal radii in ECHAM5. Doubling the effective ice crystal radii improved the scattering ratios and frequency of attenuation. Additionally, doubling the effective ice crystal radii improved the detection of ECHAM5's highest-level clouds by the radar simulator, in better agreement with CloudSat. ECHAM5 was also shown to significantly underestimate midlevel clouds and (sub)tropical low-level clouds. The low-level clouds produced were consistently perceived by the lidar simulator as too optically thick. The radar simulator demonstrated ECHAM5 overestimates the frequency of precipitation, yet underestimates its intensity compared with CloudSat observations. These findings imply compensating mechanisms inECHAM5 balance out the radiative imbalance caused by incorrect optical properties of clouds and consistently large hydrometeors in the atmosphere. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52332
Appears in Collections: 气候变化事实与影响
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作者单位: Max Planck Institute for Meteorology, Hamburg, Germany; Laboratoire de Météorologie Dynamique, IPSL, Paris, France; University of Leipzig, Leipzig, Germany
Recommended Citation:
Nam C.C.W.,Quaas J.. Evaluation of clouds and precipitation in the ECHAM5 general circulation model using CALIPSO and cloudsat satellite data[J]. Journal of Climate,2012-01-01,25(14)