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| Titel |
Observation of slant column NO2 using the super-zoom mode of AURA-OMI |
| VerfasserIn |
L. C. Valin, A. R. Russell, E. J. Bucsela, J. P. Veefkind, R. C. Cohen |
| 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 ; 4, no. 9 ; Nr. 4, no. 9 (2011-09-19), S.1929-1935 |
| Datensatznummer |
250002098
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| Publikation (Nr.) |
 copernicus.org/amt-4-1929-2011.pdf |
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| Zusammenfassung |
| We retrieve slant column NO2 from the super-zoom mode of the Ozone
Monitoring Instrument (OMI) to explore its utility for understanding
NOx emissions and variability. Slant column NO2 is operationally
retrieved from OMI (Boersma et al., 2007; Bucsela et al., 2006) with a
nadir footprint of 13 × 24 km2, the result of averaging eight
detector elements on board the instrument. For 85 orbits in late 2004, OMI
reported observations from individual "super-zoom" detector elements
(spaced at 13 × 3 km2 at nadir). We assess the spatial response
of these individual detector elements in-flight and determine an upper-bound
on spatial resolution of 9 km, in good agreement with on-ground calibration
(7 km FWHM). We determine the precision of the super-zoom mode to be
2.1 × 1015 molecules cm−2, approximately a factor of
√8 lower than an identical retrieval at operational scale as expected
if random noise dominates the uncertainty. We retrieve slant column NO2
over the Satpura power plant in India; Seoul, South Korea; Dubai, United
Arab Emirates; and a set of large point sources on the Rihand Reservoir in
India using differential optical absorption spectroscopy (DOAS). Over these
sources, the super-zoom mode of OMI observes variation in slant column
NO2 of up to 30 × the instrumental precision within one
operational footprint. |
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