Permalink : http://hdl.handle.net/2115/55016

大気エアロゾル粒子の吸湿性・雲凝結核（CCN）活性は, その雲粒化と密接に関係した重要な因子である. 本稿では, エアロゾル粒子のCCN活性を解析する上で用いられる Kohler式と, 粒子の吸湿性の程度を表すパラメータκについて簡単に説明する. また, エアロゾル粒子の吸湿性・CCN活性を理解する上で重要な有機物の吸湿性や, 未飽和・過飽和条件における吸湿成長の関係を対象とした研究について, 本稿の著者が関わったものを含めてレビューする. そして, エアロゾル粒子の吸湿性・CCN 活性に関連する課題について今後の研究の展望を述べる.
Hygroscopicity and cloud condensation nucleus (CCN) activity of atmospheric aerosol particles are important factors that are closely related to their conversion to cloud droplets. In this article, the Ko hler equation, which is used to analyze the CCN activity of aerosol particles,and a parameterκ, which represents the degree of particle hygroscopicity, are explained briefly. Then, studies on the hygroscopicity of organics, which are important for understanding the hygroscopicity and CCN activity of aerosol particles, and the relationship of hygroscopic growth under the conditions of water-vapor supersaturation to that under subsaturated conditions are reviewed, including studies in which the author of this article participated. A future outlook of the studies related to aerosol hygroscopicity and CCN activity is also presented.