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| Titel |
Accuracy and trends in OMI observations of stratospheric NO2 |
| VerfasserIn |
Ruud Dirksen, Folkert Boersma, Dmitry Ionov, Pieternel Levelt, Hennie Kelder |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250039448
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| Zusammenfassung |
| Since its launch in 2004 the Ozone Monitoring Instrument (OMI) has collected a 5+ year
record of atmospheric trace gas measurements. One of the data products is the tropospheric
and stratospheric NO2 column. Accurate satellite observations of stratospheric NO2 are
important for two reasons: firstly, because it plays a key role in the photochemistry of
stratospheric ozone and it is crucial to know whether there is a trend in stratospheric NO2.
Secondly, errors in the stratospheric column will lead to an over- or underestimation of the
tropospheric column.
We validated the OMI stratospheric columns with measurements from the SAOZ
(Systeme d’Analyse par Observations Zénithales) system and from NDACC (Network for the
detection of Atmospheric Composition Change). The measurement sites range from the
Arctic to the Antarctic and are predominantly situated at pristine locations, so that the
observed columns are hardly affected by tropospheric contributions. As independent
measurement technique we also used data from three FTIR stations that are collocated with
zenith sky instruments. The validation study for the year 2005 indicated that OMI captures
spatial and seasonal variability of stratospheric NO2 on the global scale, and showed a slight
overestimation of OMI stratospheric NO2 columns in comparison to independent data
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