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| Titel |
Comparison of GOME-2/MetOp total ozone data with Brewer spectroradiometer data over the Iberian Peninsula |
| VerfasserIn |
M. Antón, D. Loyola, M. López, J. M. Vilaplana, M. Bañón, W. Zimmer, A. Serrano |
| 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 ; 27, no. 4 ; Nr. 27, no. 4 (2009-04-01), S.1377-1386 |
| Datensatznummer |
250016463
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| Publikation (Nr.) |
 copernicus.org/angeo-27-1377-2009.pdf |
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| Zusammenfassung |
| The main objective of this article is to compare the total ozone data from
the new Global Ozone Monitoring Experiment instrument (GOME-2/MetOp) with
reliable ground-based measurement recorded by five Brewer spectroradiometers
in the Iberian Peninsula. In addition, a similar comparison for the
predecessor instrument GOME/ERS-2 is described. The period of study is a
whole year from May 2007 to April 2008. The results show that GOME-2/MetOp
ozone data already has a very good quality, total ozone columns are on
average 3.05% lower than Brewer measurements. This underestimation is
higher than that obtained for GOME/ERS-2 (1.46%). However, the relative
differences between GOME-2/MetOp and Brewer measurements show significantly
lower variability than the differences between GOME/ERS-2 and Brewer data.
Dependencies of these relative differences with respect to the satellite
solar zenith angle (SZA), the satellite scan angle, the satellite cloud
cover fraction (CF), and the ground-based total ozone measurements are
analyzed. For both GOME instruments, differences show no significant
dependence on SZA. However, GOME-2/MetOp data show a significant dependence
on the satellite scan angle (+1.5%). In addition, GOME/ERS-2 differences
present a clear dependence with respect to the CF and ground-based total
ozone; such differences are minimized for GOME-2/MetOp. The comparison
between the daily total ozone values provided by both GOME instruments shows
that GOME-2/MetOp ozone data are on average 1.46% lower than GOME/ERS-2
data without any seasonal dependence. Finally, deviations of a priori climatological
ozone profile used by the satellite retrieval algorithm from the true ozone
profile are analyzed. Although excellent agreement between a priori climatological
and measured partial ozone values is found for the middle and high
stratosphere, relative differences greater than 15% are common for the
troposphere and lower stratosphere. |
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