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| Titel |
Detection in the summer polar stratosphere of pollution plume from East Asia and North America by balloon-borne in situ CO measurements |
| VerfasserIn |
G. Krysztofiak, R. Thiéblemont, N. Huret, V. Catoire, Y. Té, F. Jégou, P. F. Coheur, C. Clerbaux, S. Payan, M. A. Drouin, C. Robert, P. Jeseck, J.-L. Attié, C. Camy-Peyret |
| 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 ; 12, no. 24 ; Nr. 12, no. 24 (2012-12-17), S.11889-11906 |
| Datensatznummer |
250011668
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| Publikation (Nr.) |
 copernicus.org/acp-12-11889-2012.pdf |
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| Zusammenfassung |
| The SPIRALE and SWIR balloon-borne instruments were launched in the
Arctic polar region (near Kiruna, Sweden, 67.9° N–21.1° E)
during summer on 7 and 24 August 2009 and on 14 August 2009, respectively.
The SPIRALE instrument performed in situ measurements of several trace gases
including CO and O3 at altitudes between 9 and 34 km, with very high
vertical resolution (∼ 5 m). The SWIR-balloon instrument measured
total and partial column of several species including CO. The CO
stratospheric profile from SPIRALE for 7 August 2009 shows some specific
structures with large concentrations in the low levels (potential
temperatures between 320 and 380 K, i.e. 10–14 km height). These
structures are not present in the CO vertical profile of SPIRALE for
24 August 2009, for which the volume mixing ratios are typical from polar
latitudes (∼ 30 ppb). CO total columns retrieved from the IASI-MetOp
satellite sounder for the three dates of flights are used to understand this
CO variability. SPIRALE and SWIR CO partial columns between 9 and 34 km are
compared, allowing us to confirm that the enhancement of CO is localised in
the stratosphere. The measurements are also investigated in terms of
CO:O3 correlations and using several modelling approaches (trajectory
calculations, potential vorticity fields, results of chemistry transport
model) in order to characterize the origin of the air masses sampled. The
emission sources are qualified in terms of source type (fires, urban
pollution) using NH3 and CO measurements from IASI-MetOp and fires
detection from MODIS on board the TERRA/AQUA satellite. The results give
strong evidence that the unusual abundance of CO on 7 August is due to
surface pollution plumes from East Asia and North America transporting to the
upper troposphere and then entering the lower stratosphere by isentropic
advection. This study strengthens evidence that the composition of low polar
stratosphere in summer may be affected by anthropogenic surface emissions
through long-range transport. |
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