DOI: 10.1002/2017JD027213
Scopus记录号: 2-s2.0-85040785147
论文题名: Distinct Contributions of Ice Nucleation, Large-Scale Environment, and Shallow Cumulus Detrainment to Cloud Phase Partitioning With NCAR CAM5
作者: Wang Y. ; Zhang D. ; Liu X. ; Wang Z.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 2 起始页码: 1132
结束页码: 1154
语种: 英语
英文关键词: CAM5
; cloud phase partitioning
; ice nucleation
; mixed-phase clouds
Scopus关键词: air temperature
; climate modeling
; cloud water
; cumulus
; global climate
; heterogeneity
; nucleation
; observational method
; parameterization
; particle size
; polar front
; Southern Hemisphere
; storm track
; Southern Ocean
英文摘要: Mixed-phase clouds containing both liquid droplets and ice particles occur frequently at high latitudes and in the midlatitude storm track regions. Simulations of the cloud phase partitioning between liquid and ice hydrometeors in state-of-the-art global climate models are still associated with large biases. In this study, the phase partitioning in terms of liquid mass phase ratio (MPRliq, defined as the ratio of liquid mass to total condensed water mass) simulated from the NCAR Community Atmosphere Model version 5 (CAM5) is evaluated against the observational data from A-Train satellite remote sensors. Modeled MPRliq is significantly lower than observations on the global scale, especially in the Southern Hemisphere (e.g., Southern Ocean and the Antarctic). Sensitivity tests with CAM5 are conducted to investigate the distinct contributions of heterogeneous ice nucleation, shallow cumulus detrainment, and large-scale environment (e.g., winds, temperature, and water vapor) to the low MPRliq biases. Our results show that an aerosol-aware ice nucleation parameterization increases the MPRliq especially at temperatures colder than −20°C and significantly improves the model agreements with observations in the Polar regions in summer. The decrease of threshold temperature over which all detrained cloud water is liquid from 268 to 253 K enhances the MPRliq and improves the MPRliq mostly over the Southern Ocean. By constraining water vapor in CAM5 toward reanalysis, modeled low biases in many geographical regions are largely reduced through a significant decrease of cloud ice mass mixing ratio. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114644
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth System Science, Tsinghua University, Beijing, China; Department of Atmospheric Science, University of Wyoming, Laramie, WY, United States; Brookhaven National Laboratory, Upton, NY, United States
Recommended Citation:
Wang Y.,Zhang D.,Liu X.,et al. Distinct Contributions of Ice Nucleation, Large-Scale Environment, and Shallow Cumulus Detrainment to Cloud Phase Partitioning With NCAR CAM5[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(2)