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| Titel |
Water vapour total columns from SCIAMACHY spectra in the 2.36 μm window |
| VerfasserIn |
H. Schrijver, A. M. S. Gloudemans, C. Frankenberg, I. Aben |
| 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 ; 2, no. 2 ; Nr. 2, no. 2 (2009-10-14), S.561-571 |
| Datensatznummer |
250000569
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| Publikation (Nr.) |
 copernicus.org/amt-2-561-2009.pdf |
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| Zusammenfassung |
The potential of the shortwave infrared channel of the atmospheric spectrometer
SCIAMACHY on Envisat to provide accurate measurements of total atmospheric
water vapour columns is explored.
It is shown that good quality results can be obtained for cloud free
scenes above the continents using the Iterative Maximum Likelihood Method.
In addition to the standard cloud filter employed in this method,
further cloud screening is obtained by comparing simultaneously
retrieved methane columns with values expected from models.
A novel method is used to correct for the scattering effects introduced
in the spectra by the ice layer on the detector window.
The retrieved water vapour total vertical columns for the period 2003–2007
are compared with
spatially and temporally collocated values
from the European Centre for Mid-Range Weather Forecast (ECMWF) data.
The observed differences for individual measurements have standard deviations
not higher than 0.3 g/cm2 and an absolute mean value smaller than
0.01 g/cm2 with some regional excursions.
The use of recently published
spectroscopic data for water vapour
led to a significant improvement in the agreement
of the retrieved water vapour total columns and the values derived from
ECMWF data.
This analysis thus supports the superior quality of the new spectroscopic
information using atmospheric data. |
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