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| Titel |
A multi-instrument comparison of integrated water vapour measurements at a high latitude site |
| VerfasserIn |
S. A. Buehler, S. Östman, C. Melsheimer, G. Holl, S. Eliasson, V. O. John, T. Blumenstock, F. Hase, G. Elgered, U. Raffalski, T. Nasuno, M. Satoh, M. Milz, J. Mendrok |
| 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 ; 12, no. 22 ; Nr. 12, no. 22 (2012-11-20), S.10925-10943 |
| Datensatznummer |
250011607
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| Publikation (Nr.) |
 copernicus.org/acp-12-10925-2012.pdf |
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| Zusammenfassung |
| We compare measurements of integrated water vapour (IWV) over a
subarctic site (Kiruna, Northern Sweden) from five different sensors
and retrieval methods: Radiosondes, Global Positioning System (GPS),
ground-based Fourier-transform infrared (FTIR) spectrometer,
ground-based microwave radiometer, and satellite-based microwave
radiometer (AMSU-B). Additionally, we compare also to ERA-Interim
model reanalysis data. GPS-based IWV data have the highest temporal
coverage and resolution and are chosen as reference data set. All
datasets agree reasonably well, but the ground-based microwave
instrument only if the data are cloud-filtered. We also address two
issues that are general for such intercomparison studies, the impact
of different lower altitude limits for the IWV integration, and the
impact of representativeness error. We develop methods for
correcting for the former, and estimating the random error
contribution of the latter. A literature survey reveals that
reported systematic differences between different techniques are
study-dependent and show no overall consistent pattern. Further
improving the absolute accuracy of IWV measurements and providing
climate-quality time series therefore remain challenging problems. |
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