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A multi-instrument comparison of integrated water vapour measurements at a high latitude site

Buehler, S. A.; Östman, S.; Melsheimer, C.; Holl, G.; Eliasson, S.; John, V. O.; Blumenstock, T.; Hase, F.; Elgered, G.; Raffalski, U.; Nasuno, T.; Satoh, M.; Milz, M.; Mendrok, J.

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, groundbased 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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Verlagsausgabe §
DOI: 10.5445/IR/1000038934
Veröffentlicht am 17.04.2018
DOI: 10.5194/acp-12-10925-2012
Zitationen: 27
Web of Science
Zitationen: 29
Cover der Publikation
Zugehörige Institution(en) am KIT Fakultät für Physik (PHYSIK)
Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2012
Sprache Englisch
Identifikator ISSN: 1867-1381, 1867-8548
KITopen-ID: 1000038934
Erschienen in Atmospheric measurement techniques
Band 12
Heft 22
Seiten 10925-10943
Nachgewiesen in Web of Science
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