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| Titel |
The effect of using limited scene-dependent averaging kernels approximations for the implementation of fast observing system simulation experiments targeted on lower tropospheric ozone |
| VerfasserIn |
P. Sellitto, G. Dufour, M. Eremenko, J. Cuesta, V.-H. Peuch, A. Eldering, D. P. Edwards, 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. 8 ; Nr. 6, no. 8 (2013-08-05), S.1869-1881 |
| Datensatznummer |
250085028
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| Publikation (Nr.) |
 copernicus.org/amt-6-1869-2013.pdf |
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| Zusammenfassung |
| Practical implementations of chemical OSSEs (Observing System
Simulation Experiments) usually rely on approximations of the
pseudo-observations by means of a predefined parametrization of the
averaging kernels, which describe the sensitivity of the observing
system to the target atmospheric species. This is intended to avoid
the use of a computationally expensive pseudo-observations
simulator, that relies on full radiative transfer calculations. Here we
present an investigation on how no, or limited, scene dependent
averaging kernels parametrizations may misrepresent the sensitivity of
an observing system. We carried out the full radiative transfer calculation for
a three-days period over Europe, to produce reference
pseudo-observations of lower tropospheric ozone, as they would be
observed by a concept geostationary observing system called MAGEAQ
(Monitoring the Atmosphere from Geostationary orbit for European Air
Quality). The selected spatio-temporal interval is characterised by
an ozone pollution event. We then compared our reference with
approximated pseudo-observations, following existing simulation
exercises made for both the MAGEAQ and GEOstationary Coastal and Air
Pollution Events (GEO-CAPE) missions. We found that approximated
averaging kernels may fail to replicate the variability of the full
radiative transfer calculations. In addition, we found that the approximations substantially overestimate the
capability of MAGEAQ to follow the spatio-temporal variations of
the lower tropospheric ozone in selected areas, during the mentioned pollution event. We conclude that such
approximations may lead to false conclusions if used in an OSSE. Thus,
we recommend to use comprehensive scene-dependent approximations of
the averaging kernels, in cases where the full radiative transfer is
computationally too costly for the OSSE being investigated. |
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