Use of in situ cloud condensation nuclei, extinction, and aerosol size distribution measurements to test a method for retrieving cloud condensation nuclei profiles from surface measurements
CaltechAUTHORS
View Archive Info| Field | Value | |
| Title |
Use of in situ cloud condensation nuclei, extinction, and aerosol size distribution measurements to test a method for retrieving cloud condensation nuclei profiles from surface measurements
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| Creator |
Ghan, Steven J.
Rissman, Tracey A. Elleman, Robert Ferrare, Richard A. Turner, David Flynn, Connor Wang, Jian Ogren, John Hudson , James Jonsson, Haflidi H. VanReken, Timothy Flagan, Richard C. Seinfeld, John H. |
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| Description |
If the aerosol composition and size distribution below cloud are uniform, the vertical profile of cloud condensation nuclei concentration can be retrieved entirely from surface measurements of CCN concentration and particle humidification function and surface-based retrievals of relative humidity and aerosol extinction or backscatter. This provides the potential for long-term measurements of CCN concentrations near cloud base. We have used a combination of aircraft, surface in situ, and surface remote sensing measurements to test various aspects of the retrieval scheme. Our analysis leads us to the following conclusions. The retrieval works better for supersaturations of 0.1% than for 1% because CCN concentrations at 0.1% are controlled by the same particles that control extinction and backscatter. If in situ measurements of extinction are used, the retrieval explains a majority of the CCN variance at high supersaturation for at least two and perhaps five of the eight flights examined. The retrieval of the vertical profile of the humidification factor is not the major limitation of the CCN retrieval scheme. Vertical structure in the aerosol size distribution and composition is the dominant source of error in the CCN retrieval, but this vertical structure is difficult to measure from remote sensing at visible wavelengths.
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| Publisher |
American Geophysical Union
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| Date |
2006-03-16
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
text/plain text/plain text/plain |
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| Identifier |
http://authors.library.caltech.edu/59753/1/239-Ghan-2006.pdf
http://authors.library.caltech.edu/59753/2/jgrd12051-sup-0001-t01.txt http://authors.library.caltech.edu/59753/2/jgrd12051-sup-0002-t02.txt http://authors.library.caltech.edu/59753/3/jgrd12051-sup-0003-t03.txt Ghan, Steven J. and Rissman, Tracey A. and Elleman, Robert and Ferrare, Richard A. and Turner, David and Flynn, Connor and Wang, Jian and Ogren, John and Hudson , James and Jonsson, Haflidi H. and VanReken, Timothy and Flagan, Richard C. and Seinfeld, John H. (2006) Use of in situ cloud condensation nuclei, extinction, and aerosol size distribution measurements to test a method for retrieving cloud condensation nuclei profiles from surface measurements. Journal of Geophysical Research D, 111 (D5). Art. No. D05S10. ISSN 0148-0227. http://resolver.caltech.edu/CaltechAUTHORS:20150818-165532823 <http://resolver.caltech.edu/CaltechAUTHORS:20150818-165532823> |
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| Relation |
http://resolver.caltech.edu/CaltechAUTHORS:20150818-165532823
http://authors.library.caltech.edu/59753/ |
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