All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 157 18 0
PDF Downloads 27 15 0

In Situ Observations of Cirrus Cloud Microphysical Properties Using the Counterflow Virtual Impactor

K. B. NooneDepartment of Meteorology, Stockholm University, Arrhenius Laboratory, Stockholm, Sweden

Search for other papers by K. B. Noone in
Current site
Google Scholar
PubMed
Close
,
K. J. NooneDepartment of Meteorology, Stockholm University, Arrhenius Laboratory, Stockholm, Sweden

Search for other papers by K. J. Noone in
Current site
Google Scholar
PubMed
Close
,
J. HeintzenbergDepartment of Meteorology, Stockholm University, Arrhenius Laboratory, Stockholm, Sweden

Search for other papers by J. Heintzenberg in
Current site
Google Scholar
PubMed
Close
,
J. StrömDepartment of Meteorology, Stockholm University, Arrhenius Laboratory, Stockholm, Sweden

Search for other papers by J. Ström in
Current site
Google Scholar
PubMed
Close
, and
J. A. OgrenDepartment of Meteorology, Stockholm University, Arrhenius Laboratory, Stockholm, Sweden

Search for other papers by J. A. Ogren in
Current site
Google Scholar
PubMed
Close
Full access

Abstract

This study presents a new technique for making in situ measurements of cirrus cloud microphysical properties. Sampling of cirrus clouds was performed using a counterflow virtual impactor (CVI). The CVI was used to sample cloud elements larger than 4 µm in aerodynamic diameter. In conjunction with a Lyman-α hygrometer, this gave a direct measurement of the condensed water content. Sampling the cloud elements with the CVI also allowed the authors to examine the size distribution of the residual particles produced by evaporation of the cloud elements. This study discusses and evaluates the CVI technique for use in sampling cirrus clouds, especially for sampling small cloud elements. Measurements of condensed water content and cloud-element (crystal and droplet) concentrations for cirrus uncinus, floccus, and cirrostratus clouds made using the CVI during the International Cirrus Experiment experiment are presented. Examples of size distributions of the residual aerosol particles from cirrus cloud elements are also presented.

Abstract

This study presents a new technique for making in situ measurements of cirrus cloud microphysical properties. Sampling of cirrus clouds was performed using a counterflow virtual impactor (CVI). The CVI was used to sample cloud elements larger than 4 µm in aerodynamic diameter. In conjunction with a Lyman-α hygrometer, this gave a direct measurement of the condensed water content. Sampling the cloud elements with the CVI also allowed the authors to examine the size distribution of the residual particles produced by evaporation of the cloud elements. This study discusses and evaluates the CVI technique for use in sampling cirrus clouds, especially for sampling small cloud elements. Measurements of condensed water content and cloud-element (crystal and droplet) concentrations for cirrus uncinus, floccus, and cirrostratus clouds made using the CVI during the International Cirrus Experiment experiment are presented. Examples of size distributions of the residual aerosol particles from cirrus cloud elements are also presented.

Save