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タイトル: A Study of Microphysical Mechanisms for Correlation Patterns between Droplet Radius and Optical Thickness of Warm Clouds with a Spectral Bin Microphysics Cloud Model
著者: Suzuki, Kentaroh
Nakajima, Teruyuki
Nakajima, Takashi Y.
Khain, Alexander P.
キーワード: Cloud microphysics
Cloud droplets
Optical properties
Spectral models
Cloud resolving models
発行日: 2010年4月
出版者: American Meteorological Society
掲載誌情報: Journal of the Atmospheric Sciences. Vol. 67, No. 4, April 2010, pp. 1126-1141
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.
URI: http://hdl.handle.net/2261/51873
ISSN: 00224928
出現カテゴリ:014 自然科学
1391010 学術雑誌

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