Soluble Mass, Hygroscopic Growth, and Droplet Activation of Coated Soot Particles during LACIS Experiment in November (LExNo)
Soluble Mass, Hygroscopic Growth, and Droplet Activation of Coated Soot Particles during LACIS Experiment in November (LExNo)
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DOI：
10.1029/2009jd012626
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发表时间：
2010-06
影响因子：
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通讯作者：
S. Henning;H. Wex;T. Hennig;A. Kiselev;J. Snider;D. Rose;U. Dusek;G. Frank;U. Pöschl;A. Kristensson;M. Bilde;R. Tillmann;A. Kiendler‐Scharr;T. Mentel;S. Walter;J. Schneider;C. Wennrich;F. Stratmann
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文献类型：
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作者：
S. Henning;H. Wex;T. Hennig;A. Kiselev;J. Snider;D. Rose;U. Dusek;G. Frank;U. Pöschl;A. Kristensson;M. Bilde;R. Tillmann;A. Kiendler‐Scharr;T. Mentel;S. Walter;J. Schneider;C. Wennrich;F. Stratmann
LAIS 11月实验(LExNo)活动于2005年11月在欧洲卓越大气网络(ACCENT)站点莱比锡气溶胶云相互作用模拟器(LACIS)进行。LExNo的目标是更深入地了解模拟老化燃烧气溶胶颗粒的涂层烟尘颗粒的激活特性。这种气雾剂是从火花产生的烟尘颗粒开始制备的。在一些实验中，煤烟颗粒通过暴露在丙醇蒸汽中而被压实；在另一些实验中，这一步骤被绕过了。用硫酸铵、左旋葡聚糖或硫酸铵和左旋葡聚糖的混合物对煤烟进行热涂层。用气溶胶质谱仪、吸湿性串联差分迁移率分析仪、两台怀俄明州静态扩散云凝结核(CCN)仪器、液滴测量技术连续流动CCN仪器和LACIS对合成的粒子进行了表征。在98%相对湿度下的吸湿生长因子与CCN活化的临界过饱和度密切相关。用两种不同的单参数Kohler模型方法和第三种方法实现了吸湿性生长、CCN活化和所研究颗粒的化学组成之间的闭合。(更少)
The LACIS Experiment in November (LExNo) campaign was conducted in November 2005 at the Atmospheric Composition Change the European Network of Excellence (ACCENT) site Leipzig Aerosol Cloud Interaction Simulator (LACIS). The goal of LExNo was to provide deeper insight into the activation properties of coated soot particles imitating aged combustion aerosol particles. The aerosols were prepared by starting with spark-generated soot particles. In some experiments the soot particles were compacted by exposure to propanol vapor; in others this step was bypassed. The soot was thermally coated with ammonium sulfate, levoglucosan, or a mixture of both ammonium sulfate and levoglucosan. The synthesized particles were investigated using aerosol mass spectrometry, a Hygroscopicity Tandem differential mobility analyzer, two Wyoming static diffusion cloud condensation nuclei (CCN) instruments, a Droplet Measurement Technologies continuous flow CCN instrument, and LACIS. A close correlation between the hygroscopic growth factor at 98% relative humidity and the critical supersaturation of CCN activation was observed. Closure between hygroscopic growth, CCN activation, and chemical composition of the investigated particles was achieved with two different single-parameter Kohler model approaches and with a third approach, a standard Kohler model using as input parameter the soluble mass as determined by aerosol mass spectrometry. (Less)