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| Titel |
Sensitivity studies of oxidative changes in the troposphere in 2100 using the GISS GCM |
| VerfasserIn |
J. L. Grenfell, D. T. Shindell  , V. Grewe |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 3, no. 5 ; Nr. 3, no. 5 (2003-09-03), S.1267-1283 |
| Datensatznummer |
250001244
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| Publikation (Nr.) |
 copernicus.org/acp-3-1267-2003.pdf |
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| Zusammenfassung |
| We examine the relative importance of chemical precursor emissions affecting ozone
(O3) and hydroxyl (OH) for the year 2100. Runs were developed from the Comparison of Tropospheric
Oxidants (Ox_Comp) modeling workshop year 2100 A2p emissions scenario, part of the
Intergovernmental Panel on Climate Change (IPCC) third assessment report (TAR). While TAR
examined only cumulative change, we examine individual components (NOx,
CH4, CO, etc.). Also, since there will be climate changes in 2100 (not accounted for by TAR), we investigate the
effect of changing our fixed SSTs/ocean ice from present day to 2100 conditions, as projected by
a coupled ocean-atmosphere model with doubled CO2. Unlike TAR we perform multiannual integrations and we include interactive
lightning. Largest changes arose from the run with 2100 industrial NOx
(O3=+16.9%, OH=+29.4% in July) and the run with 2100 methane (O3=+17.4%, OH=
-19.1% in July). In the latter run, large ozone increases in the NH upper troposphere appeared to repartition
HO2 into OH to such an extent that the lowering in OH associated with increased methane was overwhelmed in that region. Incorporating all changes
collectively led to the July tropospheric ozone burden increasing from 426 to
601 Tg (+41.1%) and the July OH concentration increasing from 13.6 to
15.2x105 molecules/cm3 (+11.8%). |
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