 |
| Titel |
Retrieval of MetOp-A/IASI CO profiles and validation with MOZAIC data |
| VerfasserIn |
E. Wachter, B. Barret, E. Flochmoën, E. Pavelin, M. Matricardi, C. Clerbaux, J. Hadji-Lazaro, M. George, D. Hurtmans, P.-F. Coheur, P. Nédélec, J. P. Cammas |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 5, no. 11 ; Nr. 5, no. 11 (2012-11-26), S.2843-2857 |
| Datensatznummer |
250003178
|
| Publikation (Nr.) |
 copernicus.org/amt-5-2843-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| The IASI (Infrared Atmospheric Sounding Interferometer) nadir-looking thermal
infrared sounder onboard MetOp-A enables the
monitoring of atmospheric constituents on a global scale. This paper presents
a quality assessment of IASI CO profiles retrieved by the two different
retrieval algorithms SOFRID and FORLI, by an intercomparison with airborne
in-situ CO profiles from the MOZAIC program for the 2008–2009 period. Lower
(surface–480 hPa) and upper tropospheric partial column (480–225 hPa)
comparisons as well as profile comparisons are made. The retrieval errors of
the IASI products are less than 21% in the lower troposphere and less than
10% in the upper troposphere. A statistical analysis shows similar
correlation coefficients for the two retrieval algorithms and smoothed MOZAIC
of r ~ 0.8 and r ~ 0.7 in the lower and upper troposphere
respectively. Comparison with smoothed MOZAIC data of the temporal variation
of the CO profiles at the airports of Frankfurt and Windhoek demonstrates
that the IASI products are able to capture the seasonal variability at these
sites. At Frankfurt SOFRID (respectively FORLI) is positively biased by 10.5% (13.0%)
compared to smoothed MOZAIC in the upper (lower) troposphere, and the limited
sensitivity of the IASI instrument to the boundary layer when thermal contrast is low is
identified. At Windhoek, the impact of the vegetation fires in Southern Africa from July to
November is captured by both SOFRID and FORLI, with an overestimation of the CO
background values (fire maxima) by SOFRID (FORLI) by 12.8% (10%). Profile
comparisons at Frankfurt and Windhoek show that the largest discrepancies are found
between the two IASI products and MOZAIC for the nighttime retrievals. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|