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| Titel |
Analysis of IASI tropospheric O3 data over the Arctic during POLARCAT campaigns in 2008 |
| VerfasserIn |
M. Pommier, C. Clerbaux, K. S. Law, G. Ancellet, P. Bernath, P.-F. Coheur, J. Hadji-Lazaro, D. Hurtmans, P. Nédélec, J.-D. Paris, F. Ravetta, T. B. Ryerson, H. Schlager, A. J. Weinheimer |
| 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. 16 ; Nr. 12, no. 16 (2012-08-16), S.7371-7389 |
| Datensatznummer |
250011390
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| Publikation (Nr.) |
 copernicus.org/acp-12-7371-2012.pdf |
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| Zusammenfassung |
| Ozone data retrieved in the Arctic region from infrared
radiance spectra recorded by the Infrared Atmospheric Sounding
Interferometer (IASI) on board the MetOp-A European satellite are presented.
They are compared with in situ and lidar observations obtained during a series of
aircraft measurement campaigns as part of the International Polar Year
POLARCAT activities in spring and summer 2008. Different air masses were
sampled during the campaigns including clean air, polluted plumes
originating from anthropogenic sources, forest fire plumes from the three
northern continents, and stratospheric-influenced air masses. The comparison
between IASI O3 [0–8 km], [0–12 km] partial columns and profiles with
collocated aircraft observations is achieved by taking into account the
different sensitivity and geometry of the sounding instruments. A detailed
analysis is provided and the agreement is discussed in terms of vertical
sensitivity and surface properties at the location of the observations.
Overall, IASI O3 profiles are found to be in relatively good agreement
with smoothed in situ and lidar profiles in the free troposphere with differences
of less than 40% (25% over sea for both seasons) and 10%,
respectively. The correlation between IASI O3 retrieved partial columns
and the smoothed aircraft partial columns is good with DC-8 in situ data in spring
over North America (r = 0.68), and over Greenland with ATR-42 lidar
measurements in summer (r = 0.67). Correlations with other data are less
significant highlighting the difficulty of IASI to capture precisely the
O3 variability in the Arctic upper troposphere and lower stratosphere
(UTLS). This is particularly noted in comparison with the [0–12 km] partial
columns. The IASI [0–8 km] partial columns display a low negative bias (by
less than 26% over snow) compared to columns derived from in situ
measurements. Despite the relatively high biases of the IASI retrievals in
the Arctic UTLS, our analysis shows that IASI can be used to identify, using
O3 / CO ratios, stratospheric intrusions. |
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