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| Titel |
Impact of nonlinearity on changing the a priori of trace gas profile estimates from the Tropospheric Emission Spectrometer (TES) |
| VerfasserIn |
S. S. Kulawik, K. W. Bowman, M. Luo, C. D. Rodgers, L. Jourdain |
| 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 ; 8, no. 12 ; Nr. 8, no. 12 (2008-06-20), S.3081-3092 |
| Datensatznummer |
250006218
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| Publikation (Nr.) |
 copernicus.org/acp-8-3081-2008.pdf |
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| Zusammenfassung |
| Non-linear maximum a posteriori (MAP) estimates of atmospheric profiles from
the Tropospheric Emission Spectrometer (TES) contains a priori information
that may vary geographically, which is a confounding factor in the analysis
and physical interpretation of an ensemble of profiles. One mitigation
strategy is to transform profile estimates to a common prior using a linear
operation thereby facilitating the interpretation of profile variability.
However, this operation is dependent on the assumption of not worse than
moderate non-linearity near the solution of the non-linear estimate. The
robustness of this assumption is tested by comparing atmospheric retrievals
from the Tropospheric Emission Spectrometer processed with a uniform prior
with those processed with a variable prior and converted to a uniform prior
following the non-linear retrieval. Linearly converting the prior following
a non-linear retrieval is shown to have a minor effect on the results as
compared to a non-linear retrieval using a uniform prior when compared to
the expected total error, with less than 10% of the change in the prior
ending up as unbiased fluctuations in the profile estimate results. |
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