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| Titel |
IASI carbon monoxide validation over the Arctic during POLARCAT spring and summer campaigns |
| VerfasserIn |
M. Pommier, K. S. Law, C. Clerbaux, S. Turquety, D. Hurtmans, J. Hadji-Lazaro, P.-F. Coheur, H. Schlager, G. Ancellet, J.-D. Paris, P. Nédélec, G. S. Diskin, J. R. Podolske, J. S. Holloway, P. Bernath |
| 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 ; 10, no. 21 ; Nr. 10, no. 21 (2010-11-12), S.10655-10678 |
| Datensatznummer |
250008887
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| Publikation (Nr.) |
 copernicus.org/acp-10-10655-2010.pdf |
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| Zusammenfassung |
| In this paper, we provide a detailed comparison between carbon monoxide (CO)
data measured by the Infrared Atmospheric Sounding Interferometer
(IASI)/MetOp and aircraft observations over the Arctic. The CO measurements
were obtained during North American (NASA ARCTAS and NOAA ARCPAC) and
European campaigns (POLARCAT-France, POLARCAT-GRACE and YAK-AEROSIB) as part
of the International Polar Year (IPY) POLARCAT activity in spring and summer
2008. During the campaigns different air masses were sampled including clean
air, polluted plumes originating from anthropogenic sources in Europe, Asia
and North America, and forest fire plumes originating from Siberia and
Canada. The paper illustrates that CO-rich plumes following different
transport pathways were well captured by the IASI instrument, in particular
due to the high spatial coverage of IASI. The comparison between IASI CO
total columns, 0–5 km partial columns and profiles with collocated aircraft
data was 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 information content and surface
properties at the location of the observations. For profiles, the data were
found to be in good agreement in spring with differences lower than 17%,
whereas in summer the difference can reach 20% for IASI profiles below 8
km for polluted cases. For total columns the correlation coefficients ranged
from 0.15 to 0.74 (from 0.47 to 0.77 for partial columns) in spring and from
0.26 to 0.84 (from 0.66 to 0.88 for partial columns) in summer. A better
agreement is seen over the sea in spring (0.73 for total column and 0.78 for
partial column) and over the land in summer (0.69 for total columns and 0.81
for partial columns). The IASI vertical sensitivity was better over land
than over sea, and better over land than over sea ice and snow allowing a
higher potential to detect CO vertical distribution during summer. |
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