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| Titel |
Analysis of the potential of one possible instrumental configuration of the next generation of IASI instruments to monitor lower tropospheric ozone |
| VerfasserIn |
P. Sellitto, G. Dufour, M. Eremenko, J. Cuesta, P. Dauphin, G. Foret, B. Gaubert, M. Beekmann, V.-H. Peuch, J.-M. Flaud |
| 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 ; 6, no. 3 ; Nr. 6, no. 3 (2013-03-08), S.621-635 |
| Datensatznummer |
250017836
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| Publikation (Nr.) |
 copernicus.org/amt-6-621-2013.pdf |
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| Zusammenfassung |
| To evaluate the added value brought by the next generation of IASI (Infrared Atmospheric Sounder Interferometer)
instruments to monitor lower tropospheric (LT) ozone, we developed a
pseudo-observation simulator, including a direct simulator of thermal
infrared spectra and a full inversion scheme to retrieve ozone concentration
profiles. We based our simulations on the instrumental configuration of IASI and of an IASI-like instrument,
with a factor 2 improvement in terms of spectral resolution and radiometric
noise. This scenario, that will be referred to as IASI/2, is one possible
configuration of the IASI-NG (New Generation) instrument (the configuration
called IASI-NG/IRS2) currently designed by CNES (Centre National d'Études
Spatiales). IASI-NG is expected to be launched in the 2020 timeframe as part
of the EPS-SG (EUMETSAT Polar System-Second Generation, formerly post-EPS)
mission. We produced one month (August 2009) of tropospheric ozone
pseudo-observations based on these two instrumental configurations. We
compared the pseudo-observations and we found a clear improvement of LT ozone
(up to 6 km altitude) pseudo-observations quality for IASI/2. The estimated
total error is expected to be more than 35% smaller at 5 km, and
20% smaller for the LT ozone column. The total error on the LT ozone
column is, on average, lower than 10% for IASI/2. IASI/2 is expected to
have a significantly better vertical sensitivity (monthly average degrees of
freedom surface–6 km of 0.70) and to be sensitive at lower altitudes (more
than 0.5 km lower than IASI, reaching nearly 3 km). Vertical ozone layers
of 4 to 5 km thickness are expected to be resolved by IASI/2, while IASI has
a vertical resolution of 6–8 km. According to our analyses, IASI/2 is
expected to have the possibility of effectively separate lower from upper
tropospheric ozone information even for low sensitivity scenarios. In
addition, IASI/2 is expected to be able to better monitor LT ozone patterns
at local spatial scale and to monitor abrupt temporal evolutions occurring at
timescales of a few days, thus bringing an expected added value with respect
to IASI for the monitoring of air quality. |
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