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A Born-Oppenheimer photolysis model of N_2O fractionation

Blake, Geoffrey A. and Liang, Mao-Chang and Morgan, Crristopher G. and Yung, Yuk L. (2003) A Born-Oppenheimer photolysis model of N_2O fractionation. Geophysical Research Letters, 30 (12). Art. No. 1656. ISSN 0094-8276. doi:10.1029/2003GL016932.

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The isotopically light N_2O produced by microbial activity is thought to be balanced by the return of heavy stratospheric nitrous oxide. The Yung and Miller [1997] method that first explained these trends yields photolytic fractionation factors ∼half those observed by experiment or predicted quantum mechanically, however. To address these issues, we present here a Born-Oppenheimer photolysis model that uses only commonly available spectroscopic data. The predicted fractionations quantitatively reproduce laboratory data, and have been incorporated into zonally averaged atmospheric simulations. Like McLinden et al. [2003] , who employ a three-dimensional chemical transport model with cross sections scaled to match laboratory data, we find excellent agreement between predictions and stratospheric measurements; additional processes that contribute to the mass independent anomaly in N_2O can only account for a fraction of its global budget.

Item Type:Article
Related URLs:
URLURL TypeDescription
Blake, Geoffrey A.0000-0003-0787-1610
Liang, Mao-Chang0000-0002-5294-9344
Yung, Yuk L.0000-0002-4263-2562
Additional Information:© 2003 American Geophysical Union. Received 15 January 2003; revised 21 March 2003; accepted 9 April 2003; published 28 June 2003. This work was supported by the Atmospheric Chemistry program of the NSF (ATM99-03790; YLY, PI). Additional NASA support to GAB is gratefully acknowledged.
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
Funding AgencyGrant Number
Subject Keywords:0317 Atmospheric Composition and Structure: Chemical kinetic and photochemical properties; 0322 Atmospheric Composition and Structure: Constituent sources and sinks.
Issue or Number:12
Record Number:CaltechAUTHORS:20120919-090835144
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Official Citation:Blake, G. A., M.-C. Liang, C. G. Morgan, and Y. L. Yung, A Born-Oppenheimer photolysis model of N2O fractionation, Geophys. Res. Lett., 30(12), 1656, doi:10.1029/ 2003GL016932, 2003
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34196
Deposited By: Ruth Sustaita
Deposited On:19 Sep 2012 16:52
Last Modified:09 Nov 2021 23:07

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