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| Titel |
Heterogeneous reaction of N2O5 with airborne TiO2 particles and its implication for stratospheric particle injection |
| VerfasserIn |
M. J. Tang, P. J. Telford, F. D. Pope, L. Rkiouak, N. L. Abraham, A. T. Archibald, P. Braesicke, J. A. Pyle, J. McGregor, I. M. Watson, R. A. Cox, M. Kalberer |
| 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 ; 14, no. 12 ; Nr. 14, no. 12 (2014-06-18), S.6035-6048 |
| Datensatznummer |
250118818
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| Publikation (Nr.) |
 copernicus.org/acp-14-6035-2014.pdf |
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| Zusammenfassung |
| Injection of aerosol particles (or their precursors) into the stratosphere to
scatter solar radiation back into space has been suggested as a
solar-radiation management scheme for the mitigation of global warming.
TiO2 has recently been highlighted as a possible candidate particle
because of its high refractive index, but its impact on stratospheric
chemistry via heterogeneous reactions is as yet unknown. In this work the
heterogeneous reaction of airborne sub-micrometre TiO2 particles with
N2O5 has been investigated for the first time, at room temperature
and different relative humidities (RH), using an atmospheric pressure aerosol
flow tube. The uptake coefficient of N2O5 onto TiO2, γ(N2O5), was determined to be ~1.0 × 10−3 at
low RH, increasing to ~3 × 10−3 at 60% RH. The
uptake of N2O5 onto TiO2 is then included in the UKCA
chemistry–climate model to assess the impact of this reaction on
stratospheric chemistry. While the impact of TiO2 on the scattering of
solar radiation is chosen to be similar to the aerosol from the Mt Pinatubo
eruption, the impact of TiO2 injection on stratospheric N2O5
is much smaller. |
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