气候变化领域集成服务门户(CCPortal): Reconciling Contrasting Relationships Between Relative Dispersion and Volume-Mean Radius of Cloud Droplet Size Distributions

CCPortal

DOI	10.1029/2019JD031868
	Reconciling Contrasting Relationships Between Relative Dispersion and Volume-Mean Radius of Cloud Droplet Size Distributions
	Lu C.; Liu Y.; Yum S.S.; Chen J.; Zhu L.; Gao S.; Yin Y.; Jia X.; Wang Y.
发表日期	2020
ISSN	2169897X
卷号	125 期号:9
英文摘要	Cloud droplet spectral relative dispersion is critical to parameterizations of cloud radiative properties, warm-rain initiation, and aerosol-cloud interactions in models; however, there is no consistent relationship between relative dispersion and volume-mean radius in literature, which hinders improving relative dispersion parameterization and calls for physical explanation. Here we show, by analyzing aircraft observations of cumulus clouds during Routine AAF [Atmospheric Radiation Measurement (ARM) Aerial Facility] Clouds with Low Optical Water Depths (CLOWD) Optical Radiative Observations, that the correlation between relative dispersion and volume-mean radius changes from positive to negative as volume-mean radius increases. With the new observation, we postulate that the sign of the correlation is determined by whether or not condensation (evaporation) occurs simultaneously with significant new activation (deactivation). The hypothesis is validated by simulations of both an adiabatic cloud parcel model and a parcel model accounting for entrainment-mixing. A new quantity, first bin strength, is introduced to quantify this new observation. Theoretical analysis of truncated gamma and modified gamma size distributions further supports the hypothesis and reconciles the contrasting relationships between relative dispersion and volume-mean radius, including the results in polluted fog observations. The results could shed new light on the so-called “twilight zone” between cloudy and cloud-free air, which in turn affects evaluation of aerosol-cloud interactions and retrieval of aerosol optical depth. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Cloud Microphysics; Relative Dispersion; Volume-Mean 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/186034
作者单位	Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD) and Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing, China; Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, NY, United States; Department of Atmospheric Sciences, Yonsei University, Seoul, South Korea; Pacific Northwest National Laboratory, Richland, WA, United States; Institute of Urban Meteorology, China Meteorological Administration, Beijing, China
推荐引用方式 GB/T 7714	Lu C.,Liu Y.,Yum S.S.,et al. Reconciling Contrasting Relationships Between Relative Dispersion and Volume-Mean Radius of Cloud Droplet Size Distributions[J],2020,125(9).
APA	Lu C..,Liu Y..,Yum S.S..,Chen J..,Zhu L..,...&Wang Y..(2020).Reconciling Contrasting Relationships Between Relative Dispersion and Volume-Mean Radius of Cloud Droplet Size Distributions.Journal of Geophysical Research: Atmospheres,125(9).
MLA	Lu C.,et al."Reconciling Contrasting Relationships Between Relative Dispersion and Volume-Mean Radius of Cloud Droplet Size Distributions".Journal of Geophysical Research: Atmospheres 125.9(2020).