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| Titel |
Comparison of total column ozone obtained by the IASI-MetOp satellite with ground-based and OMI satellite observations in the southern tropics and subtropics |
| VerfasserIn |
A. M. Toihir, H. Bencherif, V. Sivakumar, L. El Amraoui, T. Portafaix, N. Mbatha |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 33, no. 9 ; Nr. 33, no. 9 (2015-09-16), S.1135-1146 |
| Datensatznummer |
250121246
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| Publikation (Nr.) |
 copernicus.org/angeo-33-1135-2015.pdf |
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| Zusammenfassung |
| This paper presents comparison results of the total column ozone (TCO) data
product over 13 southern tropical and subtropical sites recorded from the
Infrared Atmospheric Sounder Interferometer (IASI) onboard the EUMETSAT
(European organization for the exploitation of METeorological SATellite)
MetOp (Meteorological Operational satellite program) satellite. TCO monthly
averages obtained from IASI between June 2008 and December 2012 are compared
with collocated TCO measurements from the Ozone Monitoring Instrument (OMI) on the
OMI/Aura satellite and the Dobson and SAOZ (Système d'Analyse par
Observation Zénithale) ground-based instruments. The results show that
IASI displays a positive bias with an average less than 2 % with respect
to OMI and Dobson observations, but exhibits a negative bias compared to
SAOZ over Bauru with a bias around 2.63 %. There is a good agreement
between IASI and the other instruments, especially from 15° S
southward where a correlation coefficient higher than 0.87 is found. IASI
exhibits a seasonal dependence, with an upward trend in autumn and a downward
trend during spring, especially before September 2010. After September 2010,
the autumn seasonal bias is considerably reduced due to changes made
to the retrieval algorithm of the IASI level 2 (L2) product.
The L2 product released after August (L2 O3 version 5 (v5)) matches
TCO from the other instruments better compared to version 4 (v4),
which was released between June 2008 and August 2010. IASI bias error
recorded from September 2010 is estimated to be at 1.5 % with respect to
OMI and less than ±1 % with respect to the other ground-based
instruments. Thus, the improvement made by O3 L2 version 5 (v5)
product compared with version 4 (v4), allows IASI TCO products to be used with
confidence to study the distribution and interannual variability of total
ozone in the southern tropics and subtropics. |
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