The effectiveness of N2O in depleting stratospheric ozone

Type of content
Journal Article
Thesis discipline
Degree name
Publisher
AMER GEOPHYSICAL UNION
Journal Title
Journal ISSN
Volume Title
Language
English
Date
2012
Authors
Revell LE
Bodeker GE
Smale D
Lehmann R
Huck PE
Williamson BE
Rozanov E
Struthers H
Abstract

Recently, it was shown that of the ozone-depleting substances currently emitted, N2O emissions (the primary source of stratospheric NOx dominate, and are likely to do so throughout the 21st century. To investigate the links between N2O and NOx concentrations, and the effects of NOx on ozone in a changing climate, the evolution of stratospheric ozone from 1960 to 2100 was simulated using the NIWA-SOCOL chemistry-climate model. The yield of NOx from N2O is reduced due to stratospheric cooling and a strengthening of the Brewer-Dobson circulation. After accounting for the reduced NOx yield, additional weakening of the primary NOx cycle is attributed to reduced availability of atomic oxygen, due to a) stratospheric cooling decreasing the atomic oxygen/ozone ratio, and b) enhanced rates of chlorine-catalyzed ozone loss cycles around 2000 and enhanced rates of HOx-induced ozone depletion. Our results suggest that the effects of N2O on ozone depend on both the radiative and chemical environment of the upper stratosphere, specifically CO2-induced cooling of the stratosphere and elevated CH4 4 emissions which enhance HOx -induced ozone loss and remove the availability of atomic oxygen to participate in NO x ozone loss cycles. © 2012. American Geophysical Union. All Rights Reserved.

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Citation
Keywords
Science & Technology, Physical Sciences, Geosciences, Multidisciplinary, Geology, GEOSCIENCES, MULTIDISCIPLINARY, MIDDLE ATMOSPHERE, NITROUS-OXIDE, GREENHOUSE GASES, MODEL, IMPACT, TROPOSPHERE, SIMULATION, TRANSPORT, METHANE, TRENDS
Ngā upoko tukutuku/Māori subject headings
ANZSRC fields of research
Fields of Research::37 - Earth sciences::3701 - Atmospheric sciences::370104 - Atmospheric composition, chemistry and processes
Field of Research::04 - Earth Sciences::0401 - Atmospheric Sciences::040104 - Climate Change Processes
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