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| Titel |
Improvements to the retrieval of tropospheric NO2 from satellite – stratospheric correction using SCIAMACHY limb/nadir matching and comparison to Oslo CTM2 simulations |
| VerfasserIn |
A. Hilboll, A. Richter, A. Rozanov, Ø. Hodnebrog, A. Heckel, S. Solberg, F. Stordal, J. P. Burrows |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 6, no. 3 ; Nr. 6, no. 3 (2013-03-01), S.565-584 |
| Datensatznummer |
250017832
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| Publikation (Nr.) |
 copernicus.org/amt-6-565-2013.pdf |
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| Zusammenfassung |
Satellite measurements of atmospheric trace gases have proved
to be an invaluable tool for monitoring the Earth system. When
these measurements are to be used for assessing tropospheric
emissions and pollution, as for example in the case of nadir
measurements of nitrogen dioxide (NO2), it is necessary to
separate the stratospheric from the tropospheric signal.
The SCIAMACHY instrument offers the unique opportunity to
combine its measurements in limb- and nadir-viewing geometries into
a tropospheric data product, using the limb measurements of the
stratospheric NO2 abundances to correct the nadir
measurements' total columns.
In this manuscript, we present a novel approach to limb/nadir matching,
calculating one stratospheric NO2 value from
limb measurements for every single nadir measurement, abandoning
global coverage for the sake of spatial accuracy. For comparison,
modelled stratospheric NO2 columns from the Oslo CTM2 are also
evaluated for stratospheric correction.
Our study shows that stratospheric NO2 columns from SCIAMACHY
limb measurements very well reflect stratospheric
conditions. The zonal variability of the stratospheric NO2
field is captured by our matching algorithm, and the quality of the
resulting tropospheric NO2 columns improves considerably.
Both stratospheric datasets need to be adjusted to the level of
the nadir measurements, because a time- and latitude-dependent
bias to the measured nadir columns can be
observed over clean regions. After this offset is removed, the
two datasets agree remarkably well, and both stratospheric correction
methods provide a significant improvement to the retrieval of
tropospheric NO2 columns from the SCIAMACHY instrument. |
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