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DOI10.1029/2019JD032119
Impact of Cloud Ice Particle Size Uncertainty in a Climate Model and Implications for Future Satellite Missions
Wang Y.; Su H.; Jiang J.H.; Xu F.; Yung Y.L.
发表日期2020
ISSN2169897X
卷号125期号:6
英文摘要Ice particle size is pivotal to determining ice cloud radiative effect and precipitating rate. However, there is a lack of accurate ice particle effective radius (Rei) observation on the global scale to constrain its representation in climate models. In support of future mission design, here we present a modeling assessment of the sensitivity of climate simulations to Rei and quantify the impact of the proposed mission concept on reducing the uncertainty in climate sensitivity. We perturb the parameters pertaining to ice fall speed parameter and Rei in radiation scheme, respectively, in National Center for Atmospheric Research CESM1 model with a slab ocean configuration. The model sensitivity experiments show that a settling velocity increase due to a larger Rei results in a longwave cooling dominating over a shortwave warming, a global mean surface temperature decrease, and precipitation suppression. A similar competition between longwave and shortwave cloud forcing changes also exists when perturbing Rei in the radiation scheme. Linearity generally holds for the climate response for Rei related parameters. When perturbing falling snow particle size (Res) in a similar way, we find much less sensitivity of climate responses. Our quadrupling CO2 experiments with different parameter settings reveal that Rei and Res can account for changes in climate sensitivity significantly from +12.3% to −6.2%. By reducing the uncertainty ranges of Rei and Res from a factor of 2 to ±25%, a future satellite mission under design is expected to improve the climate state simulations and reduce the climate sensitivity uncertainty pertaining to ice particle size by approximately 60%. Our results highlight the importance of better observational constraints on Rei by satellite missions. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词climate modeling; climate sensitivity; ice clouds; ice effective radius
语种英语
来源期刊Journal of Geophysical Research: Atmospheres
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/186097
作者单位Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; School of Meteorology, University of Oklahoma, Norman, OK, United States
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Wang Y.,Su H.,Jiang J.H.,et al. Impact of Cloud Ice Particle Size Uncertainty in a Climate Model and Implications for Future Satellite Missions[J],2020,125(6).
APA Wang Y.,Su H.,Jiang J.H.,Xu F.,&Yung Y.L..(2020).Impact of Cloud Ice Particle Size Uncertainty in a Climate Model and Implications for Future Satellite Missions.Journal of Geophysical Research: Atmospheres,125(6).
MLA Wang Y.,et al."Impact of Cloud Ice Particle Size Uncertainty in a Climate Model and Implications for Future Satellite Missions".Journal of Geophysical Research: Atmospheres 125.6(2020).
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