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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
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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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

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.

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

Berglen, T. F., Berntsen, T. K., Isaksen, I. S. A., and Sundet, J. K.: A global model of the coupled sulfur/oxidant chemistry in the troposphere: the sulfur cycle, J. Geophys. Res., 109, D19310, doi:10.1029/2003JD003948, 2004.; Berntsen, T. and Isaksen, I. S. A.: A global 3-D chemical transport model for the troposphere. 1. Model description and CO and ozone results, J. Geophys. Res., 102, 21239–21280, doi:10.1029/97JD01140, 1997.; Berntsen, T., Isaksen, I., Myhre, G., Fuglestvedt, J., Stordal, F., Larsen, T., Freckleton, R., and Shine, K.: Effects of anthropogenic emissions on tropospheric ozone and its radiative forcing, J. Geophys. Res., 102, 28101–28126, doi:10.1029/97JD02226, 1997.; Berntsen, T. K. and Isaksen, I. S. A.: Effects of lightning and convection on changes in upper tropospheric ozone due to NOx emissions from aircraft, Tellus B, 51, 766–788, doi:10.1034/j.1600-0889.1999.t01-3-00003.x, 1999.; Brenninkmeijer, C. A. M., Crutzen, P., Boumard, F., Dauer, T., Dix, B., Ebinghaus, R., Filippi, D., Fischer, H., Franke, H., Frie{ß}, U., Heintzenberg, J., Helleis, F., Hermann, M., Kock, H. H., Koeppel, C., Lelieveld, J., Leuenberger, M., Martinsson, B. G., Miemczyk, S., Moret, H. P., Nguyen, H. N., Nyfeler, P., Oram, D., O'Sullivan, D., Penkett, S., Platt, U., Pupek, M., Ramonet, M., Randa, B., Reichelt, M., Rhee, T. S., Rohwer, J., Rosenfeld, K., Scharffe, D., Schlager, H., Schumann, U., Slemr, F., Sprung, D., Stock, P., Thaler, R., Valentino, F., van Velthoven, P., Waibel, A., Wandel, A., Waschitschek, K., Wiedensohler, A., Xueref-Remy, I., Zahn, A., Zech, U., and Ziereis, H.: Civil Aircraft for the regular investigation of the atmosphere based on an instrumented container: The new CARIBIC system, Atmos. Chem. Phys., 7, 4953–4976, doi:10.5194/acp-7-4953-2007, 2007.; Butkovskaya, N., Kukui, A., Pouvesle, N., and Le Bras, G.: Formation of nitric acid in the gas-phase HO2 + NO reaction: effects of temperature and water vapor, J. Phys. Chem. A, 109, 6509–6520, doi:10.1021/jp051534v, 2005.; Butkovskaya, N., Kukui, A., and Le Bras, G.: HNO3 forming channel of the HO2 + NO reaction as a function of pressure and temperature in the ranges of 72–600 Torr and 223–323 K, J. Phys. Chem. A, 111, 9047–9053, doi:10.1021/jp074117m, 2007.; Cariolle, D., Evans, M. J., Chipperfield, M. P., Butkovskaya, N., Kukui, A., and Le Bras, G.: Impact of the new HNO3-forming channel of the HO2 + NO reaction on tropospheric HNO&


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