 |
| Titel |
Validation of three different scientific ozone products retrieved from IASI spectra using ozonesondes |
| VerfasserIn |
G. Dufour, M. Eremenko, A. Griesfeller, B. Barret, E. LeFlochmoën, C. Clerbaux, J. Hadji-Lazaro, P.-F. Coheur, D. Hurtmans |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 5, no. 3 ; Nr. 5, no. 3 (2012-03-27), S.611-630 |
| Datensatznummer |
250002634
|
| Publikation (Nr.) |
 copernicus.org/amt-5-611-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| Three scientific ozone products from the Infrared Atmospheric Sounding
Interferometer (IASI) aboard MetOp-A, retrieved in three different research
teams (LA, LATMOS/ULB, LISA) with different retrieval schemes, are
characterized and validated using ozonesondes measurements. The
characteristics of the products are analyzed in terms of retrieval
sensitivity, systematic and random errors, and ability to retrieve the
natural variability of ozone and focus on different partial columns from the
lower troposphere up to 30 km. The validation covers the midlatitudes and
the tropics and the period from January to December 2008. The products
present degrees of freedom (DOF) in the troposphere between 1 and 1.2 on
average in the midlatitudes and between 1 and 1.4 in the tropics. The DOF
are distributed differently on the vertical depending on the profiles and
the season: summer leading to a better sensitivity to the lower troposphere,
as expected. The error estimates range between 10 and 20% from the lower
tropospheric partial columns (0–6 km and 0–8 km for the midlatitudes and the
tropics respectively) to the UTLS partial columns (8–16 km and 11–20 km for
the midlatitudes and the tropics respectively) for all the products and are
about 5% in the stratosphere (16–30 km) and for the column up to 30 km.
The main feature that arises from the comparison with the ozonesondes is a
systematic overestimation of ozone in the UTLS (between 10 and 25%) by
the three products in the midlatitudes and the tropics, attributed to the
moderate vertical resolution of IASI and possibly to spectroscopic
inconsistencies. The ability of the products to reproduce natural
variability of tropospheric ozone is fairly good and depends on the
considered season and region. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|