The effect of anthropogenic sulfate aerosols on marine cloud droplet concentrations
The effect of anthropogenic sulfate aerosols on marine cloud droplet concentrations
复制标题
人为硫酸盐气溶胶对海洋云滴浓度的影响
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
C. F. Rogers
中科院分区：
文献类型：
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作者：
T. Novakov;C. Rivera;J. Penner;C. F. Rogers
在波多黎各的El Yunque峰的海洋气团中，对暖积云和层积云中的非海洋性硫酸盐（nss SO 4 2-）质量浓度、云凝结核（CCN）数浓度和云滴浓度进行了现场同步测量。研究结果表明，在该站点，CNN数浓度（在0.5%过饱和度下测量）和nss SO 42-质量浓度（在10400 -1700 ng m-3范围内）显著相关。积云中的液滴浓度与nss SO 42-质量浓度（在300-1400 ng m-3范围内）没有明显的变化趋势。在层积云中，当nss SO 42-质量浓度在1100 ~ 1100 ng m-3范围内时，液滴浓度略有增加。我们归因于低灵敏度的液滴数浓度的nss SO 4 2-质量浓度的卷吸/混合过程中，这些云。经验得出的灵敏度的幅度大大低于那些假设在最近的人为硫酸盐气溶胶对云的影响评估。DOI：10.1034/j.1600-0889.1994.t01-1-00005.x
Nonseasalt sulfate (nss SO 4 2- ) mass concentrations, cloud condensation nuclei (CCN) number concentrations, and cloud droplet concentrations in warm cumulus and stratocumulus clouds were simultaneously measured in situ in marine air masses on El Yunque peak in Puerto Rico. Our results show that CNN number concentrations (measured at 0.5% supersaturation) and nss SO 4 2- mass concentrations (in the range of ∼ 400–1700 ng m -3 ) are significantly correlated at this site. Droplet concentrations in the cumulus clouds studied do not show a discernible trend with nss SO 4 2- mass concentrations (in the range of ∼ 300–1400 ng m -3 ). In stratocumulus clouds, a small increase in droplet concentration with nss SO 4 2- mass concentrations in the range of ∼ 300–1100 ng m -3 was observed. We attribute the low sensitivities of the droplet number concentrations to nss SO 4 2- mass concentrations to the entrainment/mixing processes in these clouds. The magnitudes of the empirically derived sensitivities are considerably lower than those assumed in recent assessments of the effect of anthropogenic sulfate aerosols on cloud albedo. DOI: 10.1034/j.1600-0889.1994.t01-1-00005.x