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A multi-instrument comparison of integrated water vapour measurements at a high latitude site
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.ORCID iD: 0000-0001-6389-1160
Luleå tekniska universitet.
Institute of Environmental Physics, University of Bremen.
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.
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2012 (English)In: Atmospheric Chemistry And Physics, ISSN 1680-7316, E-ISSN 1680-7324, Vol. 12, no 22, 10925-10943 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2012. Vol. 12, no 22, 10925-10943 p.
National Category
Aerospace Engineering
Research subject
Space Technology
Identifiers
URN: urn:nbn:se:ltu:diva-6391DOI: 10.5194/acp-12-10925-2012Local ID: 49ee0891-07ad-4960-8e94-0d4340002398OAI: oai:DiVA.org:ltu-6391DiVA: diva2:979276
Note
Validerad; 2012; 20121207 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-21Bibliographically approved

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Buehler, StefanHoll, GerritEliasson, SalomonMilz, MathiasMendrok, Jana
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