doi:info:doi/10.1175/2009JAS3283.1

A Study of Microphysical Mechanisms for Correlation Patterns between Droplet Radius and Optical Thickness of Warm Clouds with a Spectral Bin Microphysics Cloud Model 利用統計を見る

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アイテムタイプ	学術雑誌論文 / Journal Article
言語	英語
キーワード	Cloud microphysics, Cloud droplets, Optical properties, Spectral models, Cloud resolving models
著者	Suzuki Kentaroh Nakajima Teruyuki Nakajima Takashi Y. Khain Alexander P.
著者所属	Department of Atmospheric Science, Colorado State University Center for Climate System Research, University of Tokyo Research and Information Center, Tokai University Institute of Earth Sciences, Hebrew University of Jerusalem
抄録	This study investigates the correlation patterns between cloud droplet effective radius (CDR) and cloud optical thickness (COT) of warm clouds with a nonhydrostatic spectral bin microphysics cloud model. Numerical experiments are performed with the model to simulate low-level warm clouds. The results show a positive and negative correlation pattern between CDR and COT for nondrizzling and drizzling stages of cloud development, respectively, consistent with findings of previous observational studies. Only a positive correlation is simulated when the collection process is switched off in the experiment, whereas both the positive and negative correlations are reproduced in the simulation with collection as well as condensation processes. The positive and negative correlations can also be explained in terms of an evolution pattern of the size distribution function due to condensation and collection processes, respectively. Sensitivity experiments are also performed to examine how the CDR-COT correlation patterns are influenced by dynamical and aerosol conditions. The dynamical effect tends to change the amplitude of the CDR-COT plot mainly through changing the liquid water path, whereas the aerosol amount significantly modifies the correlation pattern between CDR and COT mainly through changing the cloud particle number concentration. These results suggest that the satellite-observed relationships between CDR and COT can be interpreted as being formed through microphysical particle growth processes under various dynamical and aerosol conditions in the real atmosphere.
雑誌名	Journal of the atmospheric sciences
巻	67
号	4
ページ	1126 - 1141
発行年	2010-04
ISSN	00224928
書誌レコードID	AA00693875
DOI	info:doi/10.1175/2009JAS3283.1
権利	© Copyright 2010 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act or that satisfies the conditions specified in Section 108 of the U.S. Copyright Act (17 USC §108, as revised by P.L. 94-553) does not require the AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a web site or in a searchable database, or other uses of this material, except as exempted by the above statement, requires written permission or a license from the AMS. Additional details are provided in the AMS Copyright Policy, available on the AMS Web site located at (http://www.ametsoc.org/) or from the AMS at 617-227-2425 or copyright@ametsoc.org.
日本十進分類法	451
出版者	American Meteorological Society
異版である	http://doi.org/10.1175/2009JAS3283.1

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