The position dependent 15N enrichment of nitrous oxide in the stratosphere

Röckmann, T, Kaiser, J, Brenninkmeijer, CAM, Brand, WA, Borchers, R, Crowley, JN, Wollenhaupt, M and Crutzen, PJ (2001) The position dependent 15N enrichment of nitrous oxide in the stratosphere. Isotopes in Environmental and Health Studies, 37 (2). pp. 91-95. ISSN 1025-6016

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Abstract

The position dependent "N fractionation of nitrous oxide (N20). which cannot be obtained from mass spectrometric analysis on molecular N20 itself, can be determined with high precision using isotope ratio mass spectrometry on the NO+ fragment that is formed on electron impact in the source of an isotope ratio mass spectrometer. Laboratory UV photolysis experiments show that strong position dependent 15N fractionations occur in the photolysis of N2O in the stratosphere, its major atmospheric sink. Measurements on the isotopic composition of stratospheric N20 indeed confirm the presence of strong isotope enrichments, in particular the difference in the fractionation constants for 15N'4N0 and ''N'5N0. The absolute magnitudes of the fractionation constants found in the stratosphere are much smaller, however, than those found in the lab experiments, demonstrating the importance of dyaamicai and also additional chemical processes like the reaction of N20 with WID).

Item Type: Article
Faculty \ School: Faculty of Science > School of Environmental Sciences
Depositing User: Rosie Cullington
Date Deposited: 15 Jun 2011 10:52
Last Modified: 24 Apr 2020 23:43
URI: https://ueaeprints.uea.ac.uk/id/eprint/32605
DOI: 10.1080/10256010108033285

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