The cloud droplet size distribution (CDSD) and microphysical properties prior to monsoon rain events is studied using in-situ ground observations over a high altitude site in Western Ghats, India. The cloud microphysical properties, such as cloud droplet number concentration (CDNC), liquid water content (LWC), cloud droplet spectrum, droplet effective diameter (ED), droplet mean radius (R_m), spectral width (σ), and relative dispersion (ε) showed a considerable variation. A detailed analysis of CDSD before rain events showed single and multi-mode patterns which varied from case to case. An apparent variation in cloud microphysical properties is noted for both single and multi-mode cases. Large cloud droplets were found in both single and multi-mode clouds, and analysis revealed the possibility of entrainment of aerosols into these clouds leading to multi modes in the CDSD. Observed rain event duration indirectly suggested higher warm rain depths (D*) when multi-mode cases are observed.

使用在印度西高止山脉高海拔地区的原位地面观测研究季风降雨事件之前的云滴尺寸分布 (CDSD) 和微物理特性。云微物理特性，如云滴数浓度（CDNC）、液态水含量（LWC）、云滴光谱、滴有效直径（ED）、滴平均半径（R· _m）)、光谱宽度 (σ) 和相对色散 (ε) 显示出相当大的变化。降雨事件前对 CDSD 的详细分析表明，单模和多模模式因情况而异。在单模和多模情况下都注意到云微物理特性的明显变化。在单模云和多模云中都发现了大云滴，分析揭示了气溶胶夹带到这些云中导致 CDSD 中的多模的可能性。当观察到多模式情况时，观察到的降雨事件持续时间间接表明暖雨深度 (D*) 更高。