 |
| Titel |
Tropospheric ozone from IASI: comparison of different inversion algorithms and validation with ozone sondes in the northern middle latitudes |
| VerfasserIn |
C. Keim, M. Eremenko, J. Orphal, G. Dufour, J.-M. Flaud, M. Höpfner, A. Boynard, C. Clerbaux, S. Payan, P.-F. Coheur, D. Hurtmans, H. Claude, H. Dier, B. Johnson, H. Kelder, R. Kivi, T. Koide, M. López Bartolomé, K. Lambkin, D. Moore, F. J. Schmidlin, R. Stübi |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 24 ; Nr. 9, no. 24 (2009-12-15), S.9329-9347 |
| Datensatznummer |
250007795
|
| Publikation (Nr.) |
 copernicus.org/acp-9-9329-2009.pdf |
|
|
|
|
|
| Zusammenfassung |
| This paper presents a first statistical validation of tropospheric ozone
products derived from measurements of the IASI satellite instrument. Since the
end of 2006, IASI (Infrared Atmospheric Sounding Interferometer) aboard the
polar orbiter Metop-A measures infrared spectra of the Earth's atmosphere in
nadir geometry. This validation covers the northern mid-latitudes and the
period from July 2007 to August 2008. Retrieval results from four
different sources are presented: three are from scientific products
(LATMOS, LISA, LPMAA) and the fourth one is the pre-operational product
distributed by EUMETSAT (version 4.2). The different products
are derived from different algorithms with different approaches. The
difference and their implications for the retrieved products are discussed.
In order to evaluate the quality and the performance of each product,
comparisons with the vertical ozone concentration profiles
measured by balloon sondes are performed and lead to
estimates of the systematic and random errors in the IASI ozone
products (profiles and partial columns). A first comparison is
performed on the given profiles; a second comparison takes into
account the altitude dependent sensitivity of the retrievals.
Tropospheric columnar amounts are compared to the sonde for a lower
tropospheric column (surface to about 6 km) and a "total"
tropospheric column (surface to about 11 km). On average both
tropospheric columns have small biases for the scientific
products, less than 2 Dobson Units (DU) for the lower
troposphere and less than 1 DU for the total troposphere.
The comparison of the still pre-operational EUMETSAT
columns shows higher mean differences of about 5 DU. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|