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| Titel |
Long-term MAX-DOAS network observations of NO2 in Russia and Asia (MADRAS) during the period 2007-2012: instrumentation, elucidation of climatology, and comparisons with OMI satellite observations and global model simulations |
| VerfasserIn |
Y. Kanaya, H. Irie, H. Takashima, H. Iwabuchi, H. Akimoto, K. Sudo, M. Gu, J. Chong, Y. J. Kim, H. Lee, A. Li, F. Si, J. Xu, P.-H. Xie, W.-Q. Liu, A. Dzhola, O. Postylyakov, V. Ivanov, E. Grechko, S. Terpugova, M. Panchenko |
| 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. 15 ; Nr. 14, no. 15 (2014-08-11), S.7909-7927 |
| Datensatznummer |
250118932
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| Publikation (Nr.) |
 copernicus.org/acp-14-7909-2014.pdf |
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| Zusammenfassung |
| We conducted long-term network observations using standardized Multi-Axis
Differential optical absorption spectroscopy (MAX-DOAS) instruments in Russia
and ASia (MADRAS) from 2007 onwards and made the first synthetic data
analysis. At seven locations (Cape Hedo, Fukue and Yokosuka in Japan, Hefei
in China, Gwangju in Korea, and Tomsk and Zvenigorod in Russia) with
different levels of pollution, we obtained 80 927 retrievals of tropospheric
NO2 vertical column density (TropoNO2VCD) and aerosol optical depth
(AOD). In the technique, the optimal estimation of the TropoNO2VCD and its
profile was performed using aerosol information derived from O4
absorbances simultaneously observed at 460–490 nm. This large data set was
used to analyze NO2 climatology systematically, including temporal
variations from the seasonal to the diurnal scale. The results were compared
with Ozone Monitoring Instrument (OMI) satellite observations and global
model simulations. Two NO2 retrievals of OMI satellite data (NASA ver.
2.1 and Dutch OMI NO2 (DOMINO) ver. 2.0) generally showed close
correlations with those derived from MAX-DOAS observations, but had low
biases of up to ~50%. The bias was distinct when NO2 was
abundantly present near the surface and when the AOD was high, suggesting a
possibility of incomplete accounting of NO2 near the surface under
relatively high aerosol conditions for the satellite observations. Except for
constant biases, the satellite observations showed nearly perfect seasonal
agreement with MAX-DOAS observations, suggesting that the analysis of
seasonal features of the satellite data were robust. Weekend reduction in the
TropoNO2VCD found at Yokosuka and Gwangju was absent at Hefei, implying that
the major sources had different weekly variation patterns. While the
TropoNO2VCD generally decreased during the midday hours, it
increased exceptionally at urban/suburban locations (Yokosuka, Gwangju, and
Hefei) during winter. A global chemical transport model, MIROC-ESM-CHEM
(Model for Interdisciplinary Research on Climate–Earth System
Model–Chemistry), was validated for the first time with respect to
background NO2 column densities during summer at Cape Hedo and Fukue in
the clean marine atmosphere. |
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