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The Hno3 Forming Branch of the Ho2 + No Reaction: Pre-industrial-to-present Trends in Atmospheric Species and Radiative Forcings : Volume 11, Issue 5 (16/05/2011)

By Søvde, O. A.

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Book Id: WPLBN0003973338
Format Type: PDF Article :
File Size: Pages 35
Reproduction Date: 2015

Title: The Hno3 Forming Branch of the Ho2 + No Reaction: Pre-industrial-to-present Trends in Atmospheric Species and Radiative Forcings : Volume 11, Issue 5 (16/05/2011)  
Author: Søvde, O. A.
Volume: Vol. 11, Issue 5
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2011
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Myhre, G., Hoyle, C. R., A. Isakse, I. S., & Søvde, O. A. (2011). The Hno3 Forming Branch of the Ho2 + No Reaction: Pre-industrial-to-present Trends in Atmospheric Species and Radiative Forcings : Volume 11, Issue 5 (16/05/2011). Retrieved from http://www.ebooklibrary.org/


Description
Description: Center for International Climate and Environmental Research – Oslo (CICERO), Norway. Recent laboratory measurements have shown the existence of a HNO3 forming branch of the HO2 + NO reaction. This reaction is the main source of atmospheric O3, through the subsequent photolysis of NO2, as well as being a major source of OH. The branching of the reaction to HNO3 reduces the formation of these species significantly, affecting O3 abundances, climate and the oxidation capacity of the troposphere. The Oslo CTM2, a three-dimensional chemistry transport model, is used to calculate atmospheric composition and trends with and without the new reaction branch. Results for the present day atmosphere, when both temperature and pressure effects on the branching ratio are accounted for, show an increase of the global, annual mean methane lifetime by 10.9 %, resulting from a 14.1 % reduction in the global, annual mean OH concentration. Comparisons with measurements show that including the new branch improves the modelled O3, but that it is not possible to conclude whether the NOy distribution improves. We model an approximately 11 % reduction in the tropical tropospheric O3 increase since pre-industrial times, as well as an 8 % decrease in the trend of OH concentration, when the new branch is accounted for. The radiative forcing due to changes in O3 over the industrial era was calculated as 0.33 W m−2, reducing to 0.26 W m−2 with the new reaction branch. These results are significant, and it is important that this reaction branching is confirmed by other laboratory groups.

Summary
The HNO3 forming branch of the HO2 + NO reaction: pre-industrial-to-present trends in atmospheric species and radiative forcings

Excerpt
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