Liao, Hong and Seinfeld, John H. (1998) Effect of clouds on direct aerosol radiative forcing of climate. Journal of Geophysical Research D, 103 (D4). pp. 3781-3788. ISSN 0148-0227. doi:10.1029/97JD03455. https://resolver.caltech.edu/CaltechAUTHORS:20141029-124402302
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Abstract
The effect of a cloud layer on top-of-atmosphere (TOA) aerosol radiative forcing is examined by means of a one-dimensional vertical column simulation. To span the range between nonabsorbing and strongly absorbing particles, (NH_4)_2SO_4 and soot aerosols are considered individually and in internal and external mixtures. For a cloud layer embedded within an aerosol layer it is shown that direct aerosol radiative forcing still occurs. For a nonabsorbing aerosol a maximum in (negative) forcing actually occurs for a thin cloud layer (100 m thickness for the set of parameters considered). The presence of an embedded cloud layer enhances the heating effect of soot aerosol, producing, for thick clouds, forcing values as much as a factor of 3 over those under cloud-free conditions. An absorbing aerosol layer can lead to an increase of in-cloud solar heating rates by up to 3% for the parameter values considered here. A cirrus cloud layer above an aerosol layer leads to only modest changes of TOA aerosol forcing from those in the absence of the cloud layer; thus aerosol forcing in the presence of typical cirrus clouds cannot be neglected.
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| Additional Information: | Copyright 1998 by the American Geophysical Union. (Received September 4, 1997; revised November 25, 1997; accepted November 26, 1997.) Paper number 97JD03455. This work was supported by the National Science Foundation grant ATM-9614105. | |||||||||
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| Issue or Number: | D4 | |||||||||
| DOI: | 10.1029/97JD03455 | |||||||||
| Record Number: | CaltechAUTHORS:20141029-124402302 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20141029-124402302 | |||||||||
| Official Citation: | Liao, H., and J. H. Seinfeld (1998), Effect of clouds on direct aerosol radiative forcing of climate, J. Geophys. Res., 103(D4), 3781–3788, doi:10.1029/97JD03455. | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 51008 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | George Porter | |||||||||
| Deposited On: | 29 Oct 2014 20:15 | |||||||||
| Last Modified: | 10 Nov 2021 19:04 |
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