Microphysical properties of stratocumulus clouds during ACE‐2

IF 2.3 4区地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES Tellus Series B-Chemical and Physical Meteorology Pub Date : 2000-04-01 DOI:10.1034/J.1600-0889.2000.00076.X

H. Pawłowska, J. Brenguier

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引用次数: 110

Abstract

Microphysical measurements performed during 8 flights of the CLOUDYCOLUMN component of ACE-2, with the Meteo-France Merlin-IV, are analyzed in terms of droplet number concentration and size. The droplet concentration is dependent upon the aerosol properties within the boundary layer. Its mean value over a flight varies from 55 cm−3, for the cleanest conditions, to 244 cm−3, for the most polluted one. For each flight, the variability of the concentration, in selected cloud regions that are not affected by mixing with dry air or drizzle scavenging, ranges from 0.5 to 1.5 of the mean value. The mean volume diameter increases with altitude above cloud base according to the adiabatic cloud model. The frequency distribution of mean droplet volume normalized by the adiabatic value, for the selected regions, shows the same dispersion as the distribution of normalized concentration. The values of droplet concentration versus mean volume diameter are then examined in sub-adiabatic samples to characterize the effects of mixing and drizzle scavenging. Finally, the ratio of mean volume diameter to effective diameter is analyzed and a simple relationship between these 2 crucial parameters is proposed.

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ACE‐2期间层积云的微物理特性

利用法国Meteo-France Merlin-IV卫星对pace -2的CLOUDYCOLUMN组件进行了8次飞行，分析了液滴数量、浓度和大小的微物理测量结果。液滴浓度取决于边界层内的气溶胶性质。在一次飞行中，其平均值从最干净的55厘米−3到污染最严重的244厘米−3不等。对于每次飞行，在不受干燥空气混合或毛毛雨清除影响的选定云区，浓度的变异性为平均值的0.5至1.5。根据绝热云模式，平均体积直径随云底高度的增加而增加。对于所选区域，经绝热值归一化的平均液滴体积的频率分布与归一化浓度的分布具有相同的分散性。然后在亚绝热样品中检测液滴浓度与平均体积直径的值，以表征混合和毛毛雨清除的影响。最后，分析了平均体积直径与有效直径的比值，并给出了这两个关键参数之间的简单关系。

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Tellus Series B-Chemical and Physical Meteorology 地学-气象与大气科学

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期刊介绍： Tellus B: Chemical and Physical Meteorology along with its sister journal Tellus A: Dynamic Meteorology and Oceanography, are the international, peer-reviewed journals of the International Meteorological Institute in Stockholm, an independent non-for-profit body integrated into the Department of Meteorology at the Faculty of Sciences of Stockholm University, Sweden. Aiming to promote the exchange of knowledge about meteorology from across a range of scientific sub-disciplines, the two journals serve an international community of researchers, policy makers, managers, media and the general public.