We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Impacts of Ice-Particle Size Distribution Shape Parameter on Climate Simulations with the Community Atmosphere Model Version 6 (CAM6).
- Authors
Wentao Zhang; Xiangjun Shi; Chunsong Lu
- Abstract
The impacts of the ice crystal size distribution shape parameter (µi) were considered in the two-moment bulk cloud microphysics scheme of the Community Atmosphere Model Version 6 (CAM6). The calculating formulas of statistical mean radii indicate that, under the same mass (qi) and number (Ni) of ice crystals, the ratios of the mass-weighted radius (Rqi, not related to µi) to other statistical mean radii (e.g., effective radiative radius) are completely determined by µi. Off-line tests show that µi has a significant impact on the cloud microphysical processes owing to the µi-induced changes in ice crystal size distribution and statistical mean radii (excluding Rqi). Climate simulations show that increasing µi would lead to higher qi and lower Ni in most regions, and these impacts can be explained by the changes in cloud microphysical processes. After increasing µi from 0 to 5, the longwave cloud radiative effect increases (stronger warming effect) by 5.58 W m-2 (25.11 %), and the convective precipitation rate decreases by -0.12 mm day-1 (7.64 %). In short, the impacts of µi on climate simulations are significant and the main influence mechanisms are also clear. This suggests that the µi-related processes deserve to be parameterized in a more realistic manner.
- Subjects
ATMOSPHERIC models; ICE crystals; MICROPHYSICS
- Publication
Geoscientific Model Development Discussions, 2022, p1
- ISSN
1991-9611
- Publication type
Article
- DOI
10.5194/gmd-2022-95