scholarly journals A Diagnostic PDF Cloud Scheme to Improve Subtropical Low Clouds in NCAR Community Atmosphere Model ( CAM 5)

2018 ◽  
Vol 10 (2) ◽  
pp. 320-341 ◽  
Author(s):  
Yi Qin ◽  
Yanluan Lin ◽  
Shiming Xu ◽  
Hsi‐Yen Ma ◽  
Shaocheng Xie
Keyword(s):  
Low Clouds ◽  
Community Atmosphere Model ◽  
Atmosphere Model

scholarly journals Parametric behaviors of CLUBB in simulations of low clouds in the Community Atmosphere Model (CAM)

2015 ◽  
Vol 7 (3) ◽  
pp. 1005-1025 ◽  
Author(s):  
Zhun Guo ◽  
Minghuai Wang ◽  
Yun Qian ◽  
Vincent E. Larson ◽  
Steven Ghan ◽  
...  
Keyword(s):  
Low Clouds ◽  
Community Atmosphere Model ◽  
Atmosphere Model

scholarly journals Using A-Train Observations to Evaluate East Pacific Cloud Occurrence and Radiative Effects in the Community Atmosphere Model

2020 ◽  
Vol 33 (14) ◽  
pp. 6187-6203
Author(s):  
Elizabeth Berry ◽  
Gerald G. Mace ◽  
Andrew Gettelman
Keyword(s):  
Single Layer ◽  
Eastern Pacific ◽  
Radiative Effects ◽  
Boundary Layer Clouds ◽  
Microphysical Properties ◽  
Low Clouds ◽  
Community Atmosphere Model ◽  
Low Cloud ◽  
Atmosphere Model ◽  
The Difference

AbstractUsing information from the A-Train satellites, the properties and radiative effects of eastern Pacific Ocean boundary layer clouds are evaluated in the Community Atmosphere Model, version 5 (CAM5), from the summer of 2007 and 2008. The cloud microphysical properties are inferred using measurements from CloudSat and CALIPSO (CC) that are then used to calculate the broadband radiative flux profiles. Accounting appropriately for sampling differences between the measurements and the simulation, evidence of the “too few, too bright” low cloud bias is found in CAM5. Single-layer low clouds have a frequency of occurrence of 42% from CC, as compared with just 29% in CAM5, and the averaged cloud radiative kernel (CRK) for the model shows stronger cooling. For stratocumulus in particular, the cooling in the model CRK is larger by a factor of 2 relative to the observations, implying an overly sensitive tropical low cloud feedback. Differences in the day/night occurrence of stratocumulus help to explain some of the difference in the CRK. The cloud-type microphysics for liquid clouds is represented reasonably well by the model, with a tendency for smaller water paths and smaller effective radii. Overall, the occurrence and CRK have partially compensating errors such that the net cooling at the top of the atmosphere for eastern Pacific low clouds is −43 W m−2 in CAM5, as compared with −32 W m−2 from CC. The cooling effect in the model is accomplished by fewer low clouds with a narrower range of properties, as compared with more clouds with a broader range of properties in the observation-based dataset.

scholarly journals Evaluating and improving cloud phase in the Community Atmosphere Model version 5 using spaceborne lidar observations

2016 ◽  
Vol 121 (8) ◽  
pp. 4162-4176 ◽  
Author(s):  
Jennifer E. Kay ◽  
Line Bourdages ◽  
Nathaniel B. Miller ◽  
Ariel Morrison ◽  
Vineel Yettella ◽  
...  
Keyword(s):  
Model Version ◽  
Community Atmosphere Model ◽  
Atmosphere Model ◽  
Lidar Observations
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