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Title: Reduction of Tropical Cloudiness by Soot

Abstract

Measurements and models show that enhanced aerosol concentrations can augment cloud albedo not only by increasing total droplet cross-sectional area, but also by reducing precipitation and thereby increasing cloud water content and cloud coverage. Aerosol pollution is expected to exert a net cooling influence on the global climate through these conventional mechanisms. Here we demonstrate an opposite mechanism through which aerosols can reduce cloud cover and thus significantly offset aerosol-induced radiative cooling at the top of the atmosphere on a regional scale. In model simulations the daytime clearing of trade cumulus is hastened and intensified by solar heating in dark haze (as found over much of the northern Indian Ocean during the northeast monsoon).

Authors:
; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., Livermore, CA (US)
Sponsoring Org.:
USDOE Office of Defense Programs (DP) (US)
OSTI Identifier:
792796
Report Number(s):
UCRL-ID-138871
TRN: US200223%%582
DOE Contract Number:  
W-7405-Eng-48
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 8 May 2000
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 54 ENVIRONMENTAL SCIENCES; AEROSOLS; ALBEDO; CLIMATES; CLOUD COVER; CLOUDS; INDIAN OCEAN; POLLUTION; PRECIPITATION; RADIATIVE COOLING; SOLAR HEATING

Citation Formats

Ackerman, A S, Toon, O B, Stevens, D E, Heymsfield, A J, and Ramanathan, V. Reduction of Tropical Cloudiness by Soot. United States: N. p., 2000. Web. doi:10.2172/792796.
Ackerman, A S, Toon, O B, Stevens, D E, Heymsfield, A J, & Ramanathan, V. Reduction of Tropical Cloudiness by Soot. United States. doi:10.2172/792796.
Ackerman, A S, Toon, O B, Stevens, D E, Heymsfield, A J, and Ramanathan, V. Mon . "Reduction of Tropical Cloudiness by Soot". United States. doi:10.2172/792796. https://www.osti.gov/servlets/purl/792796.
@article{osti_792796,
title = {Reduction of Tropical Cloudiness by Soot},
author = {Ackerman, A S and Toon, O B and Stevens, D E and Heymsfield, A J and Ramanathan, V},
abstractNote = {Measurements and models show that enhanced aerosol concentrations can augment cloud albedo not only by increasing total droplet cross-sectional area, but also by reducing precipitation and thereby increasing cloud water content and cloud coverage. Aerosol pollution is expected to exert a net cooling influence on the global climate through these conventional mechanisms. Here we demonstrate an opposite mechanism through which aerosols can reduce cloud cover and thus significantly offset aerosol-induced radiative cooling at the top of the atmosphere on a regional scale. In model simulations the daytime clearing of trade cumulus is hastened and intensified by solar heating in dark haze (as found over much of the northern Indian Ocean during the northeast monsoon).},
doi = {10.2172/792796},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}

Technical Report:

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