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| Titel |
Characterisation of GOME-2 formaldehyde retrieval sensitivity |
| VerfasserIn |
W. Hewson, H. Bösch, M. P. Barkley, I. Smedt |
| 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. 2 ; Nr. 6, no. 2 (2013-02-18), S.371-386 |
| Datensatznummer |
250017396
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| Publikation (Nr.) |
 copernicus.org/amt-6-371-2013.pdf |
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| Zusammenfassung |
| Formaldehyde (CH2O) is an important tracer of tropospheric
photochemistry, whose slant column abundance can be retrieved from satellite
measurements of solar backscattered UV radiation, using differential
absorption retrieval techniques. In this work a spectral fitting sensitivity
analysis is conducted on CH2O slant columns retrieved from the Global
Ozone Monitoring Experiment 2 (GOME-2) instrument. Despite quite different
spectral fitting approaches, the retrieved CH2O slant columns have
geographic distributions that generally match expected CH2O sources,
though the slant column magnitudes and corresponding uncertainties are
particularly sensitive to the retrieval set-up. The choice of spectral
fitting window, polynomial order, I0 correction, and inclusion of minor
absorbers tend to result in the largest modulations of retrieved slant column
magnitude and fit quality. However, application of a reference sector
correction using observations over the remote Pacific Ocean is shown to
largely homogenise the resulting CH2O vertical columns obtained with
different retrieval settings, thereby largely reducing any systematic error
sources from spectral fitting. |
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