Comparisons of high-resolution extended range CCN spectra measured at 100 m altitude with cloud and drizzle microphysics in the Rain in Cumulus over the Ocean (RICO) aircraft field project are presented. CCN concentrations, N_CCN, active at supersaturations, S, >0.1% showed positive relationships with cloud droplet concentrations, N_c, measured at intermediate (606–976 m) and very high altitudes (1,763–3,699 m). These correlation coefficients, R, progressively increased with S while the two-tailed probabilities, P2, progressively decreased with S to < 10⁻⁶ at 1.6%S. More important were the positive relationships between N_CCN active at S < 0.1% and drizzle drop concentrations, N_d, at high (977–1,662 m), very high and high-very high altitudes combined (977–3,699 m). All of these relationships were consistent for eight different cloud liquid water content, L_c, thresholds (for N_c) and L_c bins (for N_d) ranging from 0.0002 to 0.3 g/m³. Negative relationships between CCN modality and low altitude (76–475 m) cloudiness coupled with no relationship of N_CCN active at any S with N_c of these low clouds indicated a cloud effect on ambient aerosol. This is a demonstration of clouds causing bimodal aerosol.

中文翻译：

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积云和毛毛雨微物理与完整 CCN 光谱的关系

介绍了在 100 m 高度测量的高分辨率扩展范围 CCN 光谱与海洋积云雨 (RICO) 飞机场项目中的云和毛毛雨微物理的比较。CCN 浓度N _CCN在过饱和状态下活跃S > 0.1% 与云滴浓度N _c呈正相关，在中间（606-976 m）和非常高的高度（1,763-3,699 m）测量。这些相关系数R随S逐渐增加，而双尾概率 P2 随 S 逐渐降低至 < 10 ^-6在 1.6%S。更重要的是N _CCN之间的正相关关系在S  < 0.1% 和细雨滴浓度N _d时活跃，在高（977-1,662 m）、非常高和非常高的海拔（977-3,699 m）组合。对于八种不同的云液态水含量L _c，所有这些关系都是一致的，阈值（对于N _c）和L _c区间（对于N _d）范围从 0.0002 到 0.3 g/m ³。CCN 模态与低空（76-475 m）多云之间的负相关，加上N _CCN在任何 S 处活动与N _c没有关系这些低云表明云对环境气溶胶的影响。这是云导致双峰气溶胶的演示。