Open AccessImpact of a cloud thermodynamic phase parameterization based on CALIPSO observations on climate simulation
Author(s) -
Cheng Anning,
Xu KuanMan,
Hu Yongxiang,
Kato Seiji
Publication year - 2012
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2011jd017263
Subject(s) - cloud fraction , environmental science , liquid water content , atmospheric sciences , liquid water path , cloud forcing , cloud top , lidar , international satellite cloud climatology project , middle latitudes , cloud albedo , climate model , relative humidity , radiative transfer , cloud feedback , latitude , cirrus , albedo (alchemy) , climatology , cloud height , satellite , meteorology , cloud computing , radiative forcing , cloud cover , aerosol , climate change , climate sensitivity , geology , remote sensing , geography , physics , geodesy , quantum mechanics , art history , astronomy , performance art , art , oceanography , computer science , operating system
This study examines the impact of a new cloud thermodynamic phase parameterization on climate simulation. The new parameterization is based on CALIPSO (Cloud‐Aerosol Lidar and Infrared Pathfinder Satellite Observation) observations and replaces the default parameterization in the Community Atmosphere Model version 4. It is shown that the application of the new cloud phase parameterization results in a small increase in global‐mean liquid water path (LWP) and a small decrease in global‐mean ice water path (IWP). Large regional increases in LWP mainly occur in tropical regions such as the western Pacific warm pool and northeastern Indian Ocean and middle latitudes, while large decreases in IWP occur in the midlatitude storm track regions. The increase in zonal‐mean cloud water content occurs at temperatures between −15°C and −30°C and cloud fraction increases occur at higher altitudes near the −30°C isotherm. Two other sensitivity experiments that favor more ice‐phase clouds also increase cloud fractions at the same altitudes, but decrease cloud water content at slightly lower altitudes. It is found that relative humidity increases at the same altitudes where the cloud fraction increases, caused by radiative cooling that is induced by cloud fraction increases but not changes in cloud water content. This result points to a deficiency in cloud fraction parameterizations that rely solely on ambient humidity without taking cloud water/ice content into account. Zonal‐mean cloud albedo forcing is sensitive to LWP in mixed‐phase clouds and the comparison with observations suggests that the CALIPSO and default parameterizations perform well in the extratropical regions.