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| Titel |
Updated Smithsonian Astrophysical Observatory Ozone Monitoring Instrument (SAO OMI) formaldehyde retrieval |
| VerfasserIn |
G. González Abad, X. Liu, K. Chance, H. Wang, T. P. Kurosu, R. Suleiman |
| 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 ; 8, no. 1 ; Nr. 8, no. 1 (2015-01-05), S.19-32 |
| Datensatznummer |
250116035
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| Publikation (Nr.) |
 copernicus.org/amt-8-19-2015.pdf |
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| Zusammenfassung |
| We present and discuss the Smithsonian Astrophysical Observatory (SAO)
formaldehyde (H2CO) retrieval algorithm for the Ozone Monitoring
Instrument (OMI) which is the operational retrieval for NASA OMI H2CO. The
version of the algorithm described here includes relevant changes with
respect to the operational one, including differences in the reference
spectra for H2CO, the fit of O2–O2 collisional complex, updates in
the high-resolution solar reference spectrum, the use of a model reference
sector over the remote Pacific Ocean to normalize the retrievals, an updated
air mass factor (AMF) calculation scheme, and the inclusion of scattering
weights and vertical H2CO profile in the level 2 products. The setup of
the retrieval is discussed in detail. We compare the results of the updated
retrieval with the results from the previous SAO H2CO retrieval. The
improvement in the slant column fit increases the temporal stability of the
retrieval and slightly reduces the noise. The change in the AMF calculation
has increased the AMFs by 20%, mainly due to the consideration of the
radiative cloud fraction. Typical values for retrieved vertical columns are
between 4 × 1015 and
4 × 1016 molecules cm−2, with typical fitting
uncertainties ranging between 45 and 100%. In high-concentration regions
the errors are usually reduced to 30%. The detection limit is estimated at
1 × 1016 molecules cm−2. |
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