Atmospheric particles acting as ice forming nuclei in different size ranges and cloud condensation nuclei measurements
Atmospheric particles acting as ice forming nuclei in different size ranges and cloud condensation nuclei measurements
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不同尺寸范围内充当冰形成核的大气颗粒和云凝结核测量
DOI：
10.1016/j.atmosres.2009.08.004
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
F. Prodi
中科院分区：
文献类型：
--
作者：
G. Santachiara;L. Matteo;F. Belosi;F. Prodi
这项工作提出了在农村现场进行的实验活动的结果（S。Pietro Capofietro，博洛尼亚附近，2007年7月），涉及测量不同大小级别的气溶胶中的冰核：PM 1，PM2.5，PM10和总悬浮颗粒（TSP）。同时测量颗粒数浓度也进行了。PM 1部分的气溶胶约占所测冰核数浓度的50%，PM10部分约占70- 90%。因此，可以被激活为冰核的气溶胶的主要部分包括空气动力学直径小于10 μm的颗粒。观察到冰和水（分别为Sice和Sw）的较高过饱和度值与冰核数浓度之间存在正相关性。Sw 2 - 10%和Sice-20 - 32%（Tair=−15 °C）的变化决定了冰核平均数浓度的大约三倍增加（从110到337 m−3）。在不同粒径范围内测量的冰核与用计数谱仪（d>0.3 μm）测量的粒子数浓度或与凝结核计数器测量的粒子数浓度之间没有相关性。
The work presents the results of an experimental campaign performed at a rural site (S. Pietro Capofiume, near Bologna July 2007) concerning measurements of ice nuclei in different size classes of aerosol: PM1, PM2.5, PM10 and total suspended particles (TSP). Simultaneous measurements of particle number concentrations were also performed. Aerosol in the PM1 fraction contributes about 50% of the measured ice nuclei number concentration, and in the PM10 fraction contributes about 70–90%. Consequently, the dominant fraction of aerosol that can be activated as ice nuclei involves particles with aerodynamic diameter less than 10 μm. A positive correlation is observed between higher supersaturation with respect to ice and water (Siceand Sw, respectively) values, and ice nuclei number concentration. The variations of Swfrom 2 to 10% and Sicefrom 20 to 32% (Tair=−15 °C) determine an approximately threefold increase (from 110 to 337 m−3) in the ice nuclei average number concentration. There is no correlation between ice nuclei measured in the different size ranges, either with the particle number concentration measured with the counter spectrometer (d>0.3 μm) or with the condensation nuclei counter.