Isotopic enrichment of nitrous oxide (15N14NO, 14N15NO, 14N14N18O) in the stratosphere and in the laboratory

Röckmann, Thomas, Kaiser, Jan, Brenninkmeijer, Carl A. M., Crowley, John N., Borchers, Reinhard, Brand, Willi A. and Crutzen, Paul J. (2001) Isotopic enrichment of nitrous oxide (15N14NO, 14N15NO, 14N14N18O) in the stratosphere and in the laboratory. Journal of Geophysical Research, 106 (D10). pp. 10403-10410. ISSN 0148-0227

Full text not available from this repository. (Request a copy)

Abstract

Nitrous oxide (N2O) extracted from stratospheric whole air samples has been analyzed for its 15N and 18O isotopic composition, and strong enrichments in the heavy isotopes are observed concomitant with decreasing N2O mixing ratio. Notably, the N enrichment is strongly different at the two nonequivalent positions in the molecule. Laboratory broadband photolysis experiments at wavelengths representative for the stratosphere confirm that photolysis is the prime cause for the observed fractionation in the stratosphere. However, the in situ stratospheric fractionation constants are significantly reduced compared to the laboratory data, reflecting the importance of dynamic processes. In addition, small but significant variations in the ratio of the two 15N fractionation constants indicate the influence of additional chemical processes like the oxidation of N2O by O(1 D).

Item Type: Article
Faculty \ School: Faculty of Science > School of Environmental Sciences
Depositing User: Rosie Cullington
Date Deposited: 15 Jun 2011 10:54
Last Modified: 24 Apr 2020 23:43
URI: https://ueaeprints.uea.ac.uk/id/eprint/32606
DOI: 10.1029/2000JD900822

Actions (login required)

View Item View Item