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| Titel |
Ship-borne FTIR measurements of CO and O3 in the Western Pacific from 43° N to 35° S: an evaluation of the sources |
| VerfasserIn |
T. Ridder, C. Gerbig, J. Notholt, M. Rex, O. Schrems, T. Warneke, L. Zhang |
| 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. 2 ; Nr. 12, no. 2 (2012-01-18), S.815-828 |
| Datensatznummer |
250010532
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| Publikation (Nr.) |
 copernicus.org/acp-12-815-2012.pdf |
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| Zusammenfassung |
Carbon monoxide (CO) and ozone (O3) have been measured in the Western
Pacific (43° N to 35° S) during a ship campaign with Research
Vessel Sonne in fall 2009. Observations have been performed using ship-based
solar absorption Fourier Transform infrared spectrometry, flask sampling,
balloon sounding, and in-situ Fourier Transform infrared analysis. The
results obtained are compared to the GEOS-Chem global 3-D chemistry transport
model for atmospheric composition. In general, a very good agreement is found
between the GEOS-Chem model and all instruments. The CO and O3
distributions show a comparable variability suggesting an impact from the
same source regions.
Tagged-CO simulations implemented in the GEOS-Chem model make it possible to
differentiate between different source processes and source regions. The
source regions are verified with HYSPLIT backward trajectory calculations. In
the Northern Hemisphere fossil fuel combustion in Asia is the dominant
source. European and North American fossil fuel combustion also contribute to
Northern Hemispheric CO pollution. In the Southern Hemisphere contributions
from biomass burning and fossil fuel combustion are dominant; African biomass
burning has a significant impact on Western Pacific CO pollution.
Furthermore, in the tropical Western Pacific enhanced upper tropospheric CO
within the tropical tropopause layer mainly originates from Indonesian fossil
fuel combustion and can be transported into the stratosphere.
The source regions of the measured O3 pollution are simulated with a
tagged-O3 simulation implemented in the GEOS-Chem model. Similar source
regions compared to the tagged-CO simulations are identified by the model. In
the Northern Hemisphere contributions from Asia, Europe, and North America
are significant. In the Southern Hemisphere emissions from South America,
south-east Africa, and Oceania significantly contribute to the measured
O3 pollution. |
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