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


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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

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).

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

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