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| Titel |
Water vapor retrieval from OMI visible spectra |
| VerfasserIn |
H. Wang, X. Liu, K. Chance, G. González Abad, C. Chan Miller |
| 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 ; 7, no. 6 ; Nr. 7, no. 6 (2014-06-30), S.1901-1913 |
| Datensatznummer |
250115832
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| Publikation (Nr.) |
 copernicus.org/amt-7-1901-2014.pdf |
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| Zusammenfassung |
| There are distinct spectral features of water vapor in the wavelength range
covered by the Ozone Monitoring Instrument (OMI) visible channel. Although
these features are much weaker than those at longer wavelengths, they can be
exploited to retrieve useful information about water vapor. They have an
advantage in that their small optical depth leads to fairly simple
interpretation as measurements of the total water vapor column density. We
have used the Smithsonian Astrophysical Observatory (SAO) OMI operational
retrieval algorithm to derive the slant column density (SCD) of water vapor
using the 430–480 nm spectral region after extensive optimization. We
convert from SCD to vertical column density (VCD) using the air mass factor
(AMF), which is calculated using look-up tables of scattering weights and
assimilated water vapor profiles. Our Level 2 product includes not only
water vapor VCD but also the associated scattering weights and AMF. In the
tropics, our standard water vapor product has a median SCD of 1.3 × 1023 molecules cm−2 and a median relative uncertainty of about
11%, about a factor of 2 better than that from a similar OMI algorithm
that uses a narrower retrieval window. The corresponding median VCD is about
1.2 × 1023 molecules cm−2. We have examined the
sensitivities of SCD and AMF to various parameters and compared our results
with those from the GlobVapour product, the Moderate Resolution Imaging
Spectroradiometer (MODIS) and the Aerosol Robotic NETwork (AERONET). |
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