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	ケーラー理論	Cloud Condensation Nuclei Analysis	WRFモデル
分野	気象学	気象学	気象学
系統	Process / pipeline	Process / pipeline	Process / pipeline
提唱年	1936	1959	2000
提唱者	Hilding Kohler	Twomey, Woodard	Skamarock and Klemp
種類	Thermodynamic equilibrium framework	Cloud microphysical measurement	Atmospheric simulation system
原典	Köhler, H. (1936). The nucleus in and the growth of hygroscopic droplets. Transactions of the Faraday Society, 32, 1152-1161.	Dusek, U., Frank, G. P., Hildebrandt, L., et al. (2006). Size matters more than chemistry for cloud-nucleating ability of aerosol particles. Science, 312(5778), 1375-1378.	Skamarock, W. C., Klemp, J. B., Dudhia, J., et al. (2008). A Description of the Advanced Research WRF Version 3. NCAR Technical Note NCAR/TN-475+STR.
別名	Kohler theory, Kohler equilibrium, Cloud droplet nucleation	CCN analysis, Cloud condensation nuclei, CCN measurement	Weather Research and Forecasting, WRF, ARW, NMM
関連	3	3	4
概要	Köhler theory is a foundational framework in cloud microphysics that predicts the equilibrium supersaturation required for an aerosol particle of given size and composition to grow into a cloud droplet. Published in 1936 by Hilding Köhler, it combines the Kelvin effect (vapor pressure enhancement over curved surfaces) with the Raoult effect (vapor pressure depression from dissolved solute) to explain cloud droplet formation.	Cloud condensation nuclei (CCN) analysis examines the number and properties of aerosol particles capable of nucleating cloud droplets at various supersaturation levels. This field involves measuring CCN concentrations, characterizing their chemical composition and size, and relating aerosol properties to cloud microphysical processes.	The Weather Research and Forecasting (WRF) model is a mesoscale atmospheric simulation system used for weather forecasting, research, and climate applications. Developed cooperatively by NCAR, NOAA, and academic institutions, WRF became operational in 2004 and has become one of the most widely used atmospheric models worldwide.