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| Titel |
Retrieval of daytime total columnar water vapour from MODIS measurements over land surfaces |
| VerfasserIn |
H. Diedrich, R. Preusker, R. Lindstrot, J. Fischer |
| 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. 2 ; Nr. 8, no. 2 (2015-02-19), S.823-836 |
| Datensatznummer |
250116138
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| Publikation (Nr.) |
 copernicus.org/amt-8-823-2015.pdf |
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| Zusammenfassung |
| A retrieval of total column water vapour (TCWV) from MODIS
(Moderate-resolution Imaging Spectroradiometer) measurements is presented.
The algorithm is adapted from a retrieval for MERIS (Medium Resolution
Imaging Spectrometer) from Lindstrot et al. (2012). It obtains the TCWV for
cloud-free scenes above land at a spatial resolution of
1 km × 1 km and provides uncertainties on a pixel-by-pixel basis.
The algorithm has been extended by introducing empirical correction
coefficients for the transmittance calculation within the forward operator.
With that, a wet bias of the MODIS algorithm against ARM microwave radiometer
data has been eliminated. The validation against other ground-based
measurements (GNSS water vapour stations, GUAN radiosondes, and AERONET sun
photometers) on a global scale reveals a bias between −0.8 and
−1.6 mm and root mean square deviations between 0.9 and
2 mm. This is an improvement in comparison to the operational TCWV
Level 2 product (bias between −1.9 and −3.2 mm and root mean
square deviations between 1.9 and 3.4 mm). The comparison to MERIS
TCWV for an example overpass exposes a systematic dry bias. |
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