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| Titel |
Vertical level selection for temperature and trace gas profile retrievals using IASI |
| VerfasserIn |
R. A. Vincent, A. Dudhia, L. J. Ventress |
| 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 ; 8, no. 6 ; Nr. 8, no. 6 (2015-06-08), S.2359-2369 |
| Datensatznummer |
250116426
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| Publikation (Nr.) |
 copernicus.org/amt-8-2359-2015.pdf |
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| Zusammenfassung |
| This work presents a new iterative method for optimally selecting a vertical
retrieval grid based on the location of the information while accounting for
inter-level correlations. Sample atmospheres initially created to parametrise
the Radiative Transfer Model for the Television Infrared Observation
Satellite Operational Vertical Sounder (RTTOV) forward model are used to compare the presented iterative selection
method with two other common approaches, which are using levels of equal
vertical spacing and selecting levels based on the cumulative trace of the
averaging kernel matrix (AKM). This new method is shown to outperform
compared methods for simulated profile retrievals of temperature, H2O,
O3, CH4, and CO with the Infrared Atmospheric Sounding
Interferometer (IASI). However, the benefits of using the more complicated
iterative approach compared to the simpler cumulative trace method are slight
and may not justify the added effort for the cases studied, but may be useful
in other scenarios where temperature and trace gases have strong vertical
gradients with significant estimate sensitivity. Furthermore, comparing
retrievals using a globally optimised static grid vs. a locally adapted one
shows that a static grid performs nearly as well for retrievals of O3,
CH4, and CO. However, developers of temperature and H2O retrieval
schemes may at least consider using adaptive or location specific vertical
retrieval grids. |
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