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| Titel |
IASI temperature and water vapor retrievals – error assessment and validation |
| VerfasserIn |
N. Pougatchev, T. August, X. Calbet, T. Hultberg, O. Oduleye, P. Schlüssel, B. Stiller, K. St. Germain, G. Bingham |
| 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 ; 9, no. 17 ; Nr. 9, no. 17 (2009-09-08), S.6453-6458 |
| Datensatznummer |
250007611
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| Publikation (Nr.) |
 copernicus.org/acp-9-6453-2009.pdf |
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| Zusammenfassung |
| The METOP-A satellite Infrared Atmospheric Sounding Interferometer (IASI)
Level 2 products comprise retrievals of vertical profiles of temperature and
water vapor. The error covariance matrices and biases of the most recent
version (4.3.1) of the L2 data were assessed, and the assessment was
validated using radiosonde data for reference. The radiosonde data set
includes dedicated and synoptic time launches at the Lindenberg station in
Germany. For optimal validation, the linear statistical Validation
Assessment Model (VAM) was used. The VAM uses radiosonde profiles as input
and provides optimal estimate of the nominal IASI retrieval by utilizing
IASI averaging kernels and statistical characteristics of the ensembles of
the reference radiosondes. For temperatures above 900 mb and water
retrievals above 700 mb, level expected and assessed errors are in good
agreement. Below those levels, noticeable excess in assessed error is
observed, possibly due to inaccurate surface parameters and undetected
clouds/haze. |
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