LACIS-measurements and parameterization of sea-salt particle hygroscopic growth and activation

被引：43

作者：

Niedermeier, D. ^{[1
]}

Wex, H. ^{[1
]}

Voigtlaender, J. ^{[1
]}

Stratmann, F. ^{[1
]}

Brueggemann, E. ^{[1
]}

Kiselev, A. ^{[1
]}

Henk, H. ^{[1
]}

Heintzenberg, J. ^{[1
]}

机构：

[1] Leibniz Inst Tropospher Res, D-04318 Leipzig, Germany

来源：

ATMOSPHERIC CHEMISTRY AND PHYSICS | 2008年 / 8卷 / 03期

关键词：

D O I：

10.5194/acp-8-579-2008

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The Leipzig Aerosol Cloud Interaction Simulator (LACIS) was used to investigate the hygroscopic growth and activation of sea-salt particles which were generated from three different sea-water samples. The measurements showed that the sea-salt particles exhibit a slightly reduced hygroscopic growth compared to pure NaCl particles. Kohler theory was utilized to model the hygroscopic growth of these particles. Some parameters used in this model are unknown for sea-salt. These parameters are combined in an 'ionic density' rho(ion). For each sea-salt sample an average rho ion was determined by fitting the Kohler equation to the data from the hygroscopic growth measurements. LACIS was also used to measure the activation of the sea-salt particles at three different supersaturations: 0.11%, 0.17% and 0.32%. A CCN-closure was tested by calculating the critical diameters Dcrit for the sea-salt particles at these supersaturations, using the Kohler model and the corresponding rho(ion) as derived from the hygroscopic growth data. These calculated critical diameters were compared to the measured ones. Measured and calculated values of Dcrit agree within the level of uncertainty. Based on this successful closure, a new parameterization to describe sea-salt-particle hygroscopic growth (at RH > 95%) and activation has been developed.

引用

页码：579 / 590

页数：12

共 37 条

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