A multi-instrument comparison of integrated water vapour measurements at a high latitude site
Artikel i vetenskaplig tidskrift, 2012

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.


S.A. Buehler

Luleå tekniska universitet

S. Östman

Luleå tekniska universitet

C. Melsheimer

Universität Bremen

G. Holl

Luleå tekniska universitet

S. Eliasson

Luleå tekniska universitet

V.O. John

Met Office

T. Blumenstock

Karlsruher Institut für Technologie (KIT)

F. Hase

Karlsruher Institut für Technologie (KIT)

Gunnar Elgered

Chalmers, Rymd- och geovetenskap, Rymdgeodesi och geodynamik

U. Raffalski

Institutet for rymdfysik

T. Nasuno

Japan Agency for Marine-Earth Science and Technology

M. Satoh

University of Tokyo

M. Milz

Luleå tekniska universitet

J. Mendrok

Luleå tekniska universitet

Atmospheric Chemistry and Physics

1680-7316 (ISSN) 1680-7324 (eISSN)

Vol. 12 22 10925-10943


Meteorologi och atmosfärforskning


Grundläggande vetenskaper



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