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The Very Short-lived Ozone Depleting Substance Chbr3 (Bromoform): Revised Uv Absorption Spectrum, Atmospheric Lifetime and Ozone Depletion Potential : Volume 13, Issue 12 (16/12/2013)

By Papanastasiou, D. K.

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Book Id: WPLBN0003996600
Format Type: PDF Article :
File Size: Pages 26
Reproduction Date: 2015

Title: The Very Short-lived Ozone Depleting Substance Chbr3 (Bromoform): Revised Uv Absorption Spectrum, Atmospheric Lifetime and Ozone Depletion Potential : Volume 13, Issue 12 (16/12/2013)  
Author: Papanastasiou, D. K.
Volume: Vol. 13, Issue 12
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Mckeen, S. A., Burkholder, J. B., & Papanastasiou, D. K. (2013). The Very Short-lived Ozone Depleting Substance Chbr3 (Bromoform): Revised Uv Absorption Spectrum, Atmospheric Lifetime and Ozone Depletion Potential : Volume 13, Issue 12 (16/12/2013). Retrieved from http://www.ebooklibrary.org/


Description
Description: Earth System Research Laboratory, Chemical Sciences Division, National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, CO 80305, USA. CHBr3 (bromoform) is a short-lived atmospheric trace compound that is primarily of natural origin and is a source of reactive bromine in both the troposphere and stratosphere. Estimating the overall atmospheric impact of CHBr3 and its transport to the stratosphere requires a thorough understanding of its atmospheric loss processes, which are primarily UV photolysis and reaction with the OH radical. In this study, UV absorption cross sections, Σ (Λ,T), for CHBr3 were measured at wavelengths between 300 and 345 nm at temperatures between 260 and 330 K using cavity ring-down spectroscopy. The present results are compared with currently recommended values for use in atmospheric models and the discrepancies are discussed. A parameterization of the CHBr3 UV spectrum for use in atmospheric models is developed and illustrative photolysis rate calculations are presented to highlight the impact of the revised Σ (Λ,T) values on its calculated local lifetimes. Seasonally dependent ozone depletion potentials (ODPs) for CHBr3 emitted in the Indian sub-continent were calculated to be 0.08, 0.26, 0.54, and 0.17 (Winter, Spring, Summer, Fall) using the semi–empirical relationship of Brioude et al. (2010).

Summary
The very short-lived ozone depleting substance CHBr3 (bromoform): revised UV absorption spectrum, atmospheric lifetime and ozone depletion potential

Excerpt
Aschmann, J. and Sinnhuber, B.-M.: Contribution of very short-lived substances to stratospheric bromine loading: uncertainties and constraints, Atmos. Chem. Phys., 13, 1203–1219, doi:10.5194/acp-13-1203-2013, 2013.; Bayes, K. D., Friedl, R. R., Sander, S. P., and Toohey, D. W.: Measurements of quantum yields of bromine atoms in the photolysis of bromoform from 266 to 324 nm, J. Geophys. Res., 108, 4095, doi:10.1029/2002JD002877, 2003.; Brioude, J., Portmann, R. W., Daniel, J. S., Cooper, O. R., Frost, G. J., Rosenlof, K. H., Granier, C., Ravishankara, A. R., Montzka, S. A., and Stohl, A.: Variations in ozone depletion potentials of very short-lived substances with season and emission region, Geophys. Res. Lett., 37, L19804, doi:10.1029/2010GL044856, 2010.; Feierabend, K. J., Flad, J. E., Brown, S. S., and Burkholder, J. B.: HCO quantum yields in the photolysis of HC(O)C(O)H (Glyoxal) between 290 and 420 nm, J. Phys. Chem. A, 113, 7784–7794, 2009.; Gillotay, D., Jenouvrier, A., Coquart, B., Merienne, M. F., and Simon, P. C.: Ultraviolet absorption cross-sections of bromoform in the temperature range 295–240 K, Planet. Space Sci., 37, 1127–1140, 1989.; Hossaini, R., Chipperfield, M. P., Monge-Sanz, B. M., Richards, N. A. D., Atlas, E., and Blake, D. R.: Bromoform and dibromomethane in the tropics: a 3-D model study of chemistry and transport, Atmos. Chem. Phys., 10, 719–735, doi:10.5194/acp-10-719-2010, 2010.; Huang, H.-Y., Chuang, W.-T., Sharma, R. C., Hsu, C.-Y., Lin, K.-C., and Hu, C.-H.: Molecular elimination of Br2 in 248 nm photolysis of bromoform probed by using cavity ring-down absorption spectroscopy, J. Chem. Phys., 121, 5253–5260, 2004.; Madronich, S. and Flocke, S.: The role of solar radiation in atmospheric chemistry, in: Handbook of Environmental Chemistry, edited by: Boule, P., Springer-Verlag, Heidelberg, 1–26, 1998.; Maric, D., Burrows, J. P., and Moortgat, G. K.: A study of the UV-visible absorption spectra of Br2 and BrCl, J. Photochem. Photobio. A, 83, 179–192, 1994.; Moortgat, G. K., Meller, R., and Schneider, W.: Temperature dependence (256–296 K) of the absorption cross-sections of bromoform in the wavelength range 285–360 nm, in: The Tropospheric Chemistry of Ozone in the Polar Regions, edited by: Niki, H. and Becker, K. H., Springer-Verlag, Berlin, Heidelberg, Vol. 17, 1993.; O'Keefe, A. and Deacon, D. A. G.: Cavity ring-down optical spectrometer for absorption measurements using pulsed laser sources, Rev. Sci. Instrum., 59, 2544–2551, 1988.; Orkin, V. L., Khamaganov, V. G., Kozlov, S. N., and Kurylo, M. J.: Measurements of rate constants for the OH reactions with bromoform (CHBr3), CHBr2Cl, CHBrCl2, and epichlorohydrin (\chemC_3H_5ClO), J. Phys. Chem. A, 117, 3809–3818, doi:10.1021/jp3128753, 2013.; Papanastasiou, D., Rontu Carlon, N., Neuman, J. A., Fleming, E. L., Jackman, C. H., and Burkholder, J. B.: Revised UV absorption cross sections of \chemCF_2Br_2, CF2ClBr, and \chemCF_2BrCF_2Br and ozone depletion potentials, Geophys. Res. Lett., 40, 464–469, doi:10.1002/GRL.50121, 2013.; Peterson, K. A. and Francisco, J. S.: Should bromoform absorb at wavelengths longer than 300 nm?, J. Chem. Phys., 117, 6103–6107, 2002.; Pisso, I., Haynes, P. H., and Law, K. S.: Emission location dependent ozone depletion potentials for very sh

 

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