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| Titel |
Carbon monoxide distributions from the IASI/METOP mission: evaluation with other space-borne remote sensors |
| VerfasserIn |
M. George, C. Clerbaux, D. Hurtmans, S. Turquety, P.-F. Coheur, M. Pommier, J. Hadji-Lazaro, D. P. Edwards, H. Worden, M. Luo, C. Rinsland, W. McMillan |
| 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 ; 9, no. 21 ; Nr. 9, no. 21 (2009-11-03), S.8317-8330 |
| Datensatznummer |
250007728
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| Publikation (Nr.) |
 copernicus.org/acp-9-8317-2009.pdf |
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| Zusammenfassung |
| The Infrared Atmospheric Sounding Interferometer (IASI) onboard the MetOp
satellite measures carbon monoxide (CO) on a global scale, twice a day. CO
total columns and vertical profiles are retrieved in near real time from the
nadir radiance spectra measured by the instrument in the thermal infrared
(TIR) spectral range. This paper describes the measurement vertical
sensitivity and provides a first assessment of the capabilities of IASI to
measure CO distributions. On the global scale, 0.8 to 2.4 independent pieces
of information are available for the retrieval. At mid latitudes, the
information ranges between 1.5 and 2, which enables the lower and upper
troposphere to be distinguished, especially when thermal contrast is
significant. Global distributions of column CO are evaluated with
correlative observations available from other nadir looking TIR missions
currently in operation: the Measurements of Pollution in the Troposphere
(MOPITT) onboard TERRA, the Atmospheric Infrared Sounder (AIRS) onboard AQUA
and the Tropospheric Emission Spectrometer (TES) onboard AURA. The IASI CO
columns are compared with MOPITT, AIRS and TES CO columns, adjusted with the
a priori, for three different months: August 2008, November 2008 and
February 2009. On average, total column discrepancies of about 7% are
found between IASI and the three other sounders in the Northern Hemisphere
and in the equatorial region. However when strong CO concentrations are
present, such as during fire events, these discrepancies can climb as high
as 17%. Instrument specifications of IASI versus other missions are also
discussed. |
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