Role of molecular size in cloud droplet activation

被引：57

作者：

Petters, M. D. ^{[1
,2
]}

Kreidenweis, S. M. ^{[1
]}

Prenni, A. J. ^{[1
]}

Sullivan, R. C. ^{[1
]}

Carrico, C. M. ^{[1
]}

Koehler, K. A. ^{[1
]}

Ziemann, P. J. ^{[3
]}

机构：

[1] Colorado State Univ, Dept Atmospher Sci, Ft Collins, CO 80523 USA

[2] N Carolina State Univ, Dept Marine Earth & Atmospher Sci, Raleigh, NC 27695 USA

[3] Univ Calif Riverside, Air Pollut Res Ctr, Riverside, CA 92521 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2009年 / 36卷

关键词：

SECONDARY ORGANIC AEROSOL; SINGLE-PARAMETER REPRESENTATION; CONDENSATION NUCLEUS ACTIVITY; HYGROSCOPIC GROWTH; CCN ACTIVATION; PARTICLES; VOLATILITY; KINETICS;

D O I：

10.1029/2009GL040131

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We examine the observed relationships between molar volume (the ratio of molar mass and density) and cloud condensation nuclei (CCN) activity for sufficiently soluble organic compounds found in atmospheric particulate matter. Our data compilation includes new CCN data for certain carbohydrates and oligoethylene glycols, as well as published data for organic compounds. We compare predictions of CCN activity using water activities based on Raoult's law and Flory-Huggins theory to observations. The Flory-Huggins water activity expression, with an assumed surface tension of pure water, generally predicts CCN activity within a factor of two over the full range of molar volumes considered. CCN activity is only weakly dependent on molar volume for values exceeding 600 cm 3 mol(-1), and the diminishing sensitivity to molar volume, combined with the significant scatter in the data, limits the accuracy with which molar volume can be inferred from CCN measurements. Citation: Petters, M. D., S. M. Kreidenweis, A. J. Prenni, R. C. Sullivan, C. M. Carrico, K. A. Koehler, and P. J. Ziemann (2009), Role of molecular size in cloud droplet activation, Geophys. Res. Lett., 36, L22801, doi: 10.1029/2009GL040131.

引用

页数：5

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