ORA Journal article: "Brightening of the global cloud field by nitric acid and the associated radiative forcing" - uuid:bb12e79f-eaac-45dd-9094-0f8cf5ce9e6b

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http://ora.ox.ac.uk/objects/pubs:353672

Reference: Makkonen, R, Romakkaniemi, S, Kokkola, H et al., (2012). Brightening of the global cloud field by nitric acid and the associated radiative forcing. ATMOSPHERIC CHEMISTRY AND PHYSICS, 12 (16), 7625-7633.

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Title: Brightening of the global cloud field by nitric acid and the associated radiative forcing

Abstract: Clouds cool Earth's climate by reflecting 20% of the incoming solar energy, while also trapping part of the outgoing radiation. The effect of human activities on clouds is poorly understood, but the present-day anthropogenic cooling via changes of cloud albedo and lifetime could be of the same order as warming from anthropogenic addition in CO2. Soluble trace gases can increase water condensation to particles, possibly leading to activation of smaller aerosols and more numerous cloud droplets. We have studied the effect of nitric acid on the aerosol indirect effect with the global aerosol-climate model ECHAM5.5-HAM2. Including the nitric acid effect in the model increases cloud droplet number concentrations globally by 7%. The nitric acid contribution to the present-day cloud albedo effect was found to be-0.32 W m and to the total indirect effect-0.46 W m . The contribution to the cloud albedo effect is shown to increase to-0.37 W m by the year 2100, if considering only the reductions in available cloud condensation nuclei. Overall, the effect of nitric acid can play a large part in aerosol cooling during the following decades with decreasing SO2 emissions and increasing NOx and greenhouse gases. © 2012 Author(s).


Publication status:Published
Notes:Makkonen, R. et al. (2012). 'Brightening of the global cloud field by nitric acid and the associated radiative forcing', Atmospheric Chemistry and Physics, 12(16), 7625-7633. [Available at http://www.atmos-chem-phys.net/12/7625/2012/]. © Authors 2012. This work is distributed under the terms of the Creative Commons Attribution 3.0 Licence (http://creativecommons.org/licenses/by/3.0/). This permits the copying, distribution, transmission and adaption of the work, provided the original authors are credited. For any reuse or distribution, you must make clear to others the license terms of this work. These conditions may be waived if you get permission from the copyright holder.
About The Authors
Makkonen, R More by this author
 
Romakkaniemi, S More by this author
 
Kokkola, H More by this author
 
 
Raisanen, P More by this author
 
 
Feichter, J More by this author
 
Kulmala, M More by this author
 
Laaksonen, A More by this author
 
Bibliographic Details
Journal: ATMOSPHERIC CHEMISTRY AND PHYSICS see more from them
Volume: 12
Issue: 16
Extent: 7625-7633
Issue Date: 2012
Identifiers
Urn: uuid:bb12e79f-eaac-45dd-9094-0f8cf5ce9e6b
Issn: 1680-7316
Doi: 10.5194/acp-12-7625-2012
Source identifier: 353672
Eissn: 1680-7324
Item Description
Type: Journal article;
Language: aa
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Member of collection : ora:journalarticle
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