A multi-instrument comparison of integrated water vapour measurements at a high latitude site
Journal article, 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 University of Technology

S. Östman

Luleå University of Technology

C. Melsheimer

Universität Bremen

G. Holl

Luleå University of Technology

S. Eliasson

Luleå University of Technology

V.O. John

Met Office

T. Blumenstock

Karlsruhe Institute of Technology (KIT)

F. Hase

Karlsruhe Institute of Technology (KIT)

Gunnar Elgered

Chalmers, Earth and Space Sciences, Space Geodesy and Geodynamics

U. Raffalski

The Swedish Institute of Space Physics

T. Nasuno

Japan Agency for Marine-Earth Science and Technology

M. Satoh

University of Tokyo

M. Milz

Luleå University of Technology

J. Mendrok

Luleå University of Technology

Atmospheric Chemistry and Physics

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

Vol. 12 22 10925-10943

Subject Categories

Meteorology and Atmospheric Sciences


Basic sciences



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9/6/2018 1