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| Titel |
Optimal estimation of tropospheric H2O and δD with IASI/METOP |
| VerfasserIn |
M. Schneider, F. Hase |
| 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 ; 11, no. 21 ; Nr. 11, no. 21 (2011-11-10), S.11207-11220 |
| Datensatznummer |
250010183
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| Publikation (Nr.) |
 copernicus.org/acp-11-11207-2011.pdf |
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| Zusammenfassung |
| We present optimal estimates of tropospheric H2O and δD derived
from radiances measured by the instrument IASI (Infrared Atmospheric Sounding
Interferometer) flown on EUMETSAT's polar orbiter METOP. We document that the
IASI spectra allow for retrieving H2O profiles between the surface and the
upper troposphere as well as middle tropospheric δD values. A
theoretical error estimation suggests a precision for H2O of better than
35% in the lower troposphere and of better than 15% in the middle
and upper troposphere, respectively, whereby surface emissivity and
atmospheric temperature uncertainties are the leading error sources. For the
middle tropospheric δD values we estimate a precision of
15–20‰ with the measurement noise being the dominating error
source. The accuracy of the IASI products is estimated to about
20–10% and 10‰ for lower to upper tropospheric H2O
and middle tropospheric δD, respectively. It is limited by systematic
uncertainties in the applied spectroscopic parameters and the a priori
atmospheric temperature profiles. We compare our IASI products to a large
number of near coincident radiosonde in-situ and ground-based FTS (Fourier
Transform Spectrometer) remote sensing measurements. The bias and the scatter
between the different H2O and δD data sets are consistent with the
combined theoretical uncertainties of the involved measurement techniques. |
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