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Effect of clouds on direct aerosol radiative forcing of climate

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.

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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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Seinfeld, John H.0000-0003-1344-4068
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
Record Number:CaltechAUTHORS:20141029-124402302
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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
Deposited By: George Porter
Deposited On:29 Oct 2014 20:15
Last Modified:10 Nov 2021 19:04

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