Sign up & Download
Sign in

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

by 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 show all authors
Atmospheric Chemistry and Physics ()

Abstract

We compare measurements of integrated water vapour (IWV) over a subarctic\nsite (Kiruna, Northern Sweden) from five different sensors and retrieval\nmethods: Radiosondes, Global Positioning System (GPS), ground-based\nFourier-transform infrared (FTIR) spectrometer, ground-based microwave\nradiometer, and satellite-based microwave radiometer (AMSU-B). Additionally,\nwe compare also to ERA-Interim model reanalysis data. GPS-based IWV\ndata have the highest temporal coverage and resolution and are chosen\nas reference data set. All datasets agree reasonably well, but the\nground-based microwave instrument only if the data are cloud-filtered.\nWe also address two issues that are general for such intercomparison\nstudies, the impact of different lower altitude limits for the IWV\nintegration, and the impact of representativeness error. We develop\nmethods for correcting for the former, and estimating the random\nerror contribution of the latter. A literature survey reveals that\nreported systematic differences between different techniques are\nstudy-dependent and show no overall consistent pattern. Further improving\nthe absolute accuracy of IWV measurements and providing climate-quality\ntime series therefore remain challenging problems.

Cite this document (BETA)

Readership Statistics

11 Readers on Mendeley
by Discipline
 
 
 
by Academic Status
 
27% Post Doc
 
18% Researcher (at an Academic Institution)
 
18% Associate Professor
by Country
 
9% Brazil

Sign up today - FREE

Mendeley saves you time finding and organizing research. Learn more

  • All your research in one place
  • Add and import papers easily
  • Access it anywhere, anytime

Start using Mendeley in seconds!

Already have an account? Sign in