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| Titel |
Evaluation of OMI operational standard NO2 column retrievals using in situ and surface-based NO2 observations |
| VerfasserIn |
L. N. Lamsal, N. A. Krotkov, E. A. Celarier, W. H. Swartz, K. E. Pickering, E. J. Bucsela, J. F. Gleason, R. V. Martin, S. Philip, H. Irie, A. Cede, J. Herman, A. Weinheimer, J. J. Szykman, T. N. Knepp |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 21 ; Nr. 14, no. 21 (2014-11-05), S.11587-11609 |
| Datensatznummer |
250119138
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| Publikation (Nr.) |
 copernicus.org/acp-14-11587-2014.pdf |
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| Zusammenfassung |
| We assess the standard operational nitrogen dioxide (NO2)
data product (OMNO2, version 2.1) retrieved from the Ozone
Monitoring Instrument (OMI) onboard NASA's Aura satellite using
a combination of aircraft and surface in~situ measurements as well
as ground-based column measurements at several locations and
a bottom-up NOx emission inventory over the continental
US. Despite considerable sampling differences, NO2 vertical
column densities from OMI are modestly correlated (r = 0.3–0.8)
with in situ measurements of tropospheric NO2 from aircraft,
ground-based observations of NO2 columns from MAX-DOAS and
Pandora instruments, in situ surface NO2 measurements from
photolytic converter instruments, and a bottom-up NOx
emission inventory. Overall, OMI retrievals tend to be lower in
urban regions and higher in remote areas, but generally agree with
other measurements to within ± 20%. No consistent seasonal
bias is evident. Contrasting results between different data sets
reveal complexities behind NO2 validation. Since
validation data sets are scarce and are limited in space and time,
validation of the global product is still limited in scope by
spatial and temporal coverage and retrieval conditions. Monthly
mean vertical NO2 profile shapes from the Global Modeling
Initiative (GMI) chemistry-transport model (CTM) used in the OMI
retrievals are highly consistent with in situ aircraft measurements,
but these measured profiles exhibit considerable day-to-day
variation, affecting the retrieved daily NO2 columns by up to
40%. This assessment of OMI tropospheric NO2 columns, together
with the comparison of OMI-retrieved and model-simulated NO2
columns, could offer diagnostic evaluation of the model. |
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