Intercomparison of integrated water vapour measurements

Authors: Martin, Lorenz; Mätzler, Christian; Hewison, Tim J.; Ruffieux, Dominique

Source: Meteorologische Zeitschrift, Volume 15, Number 1, February 2006 , pp. 57-64(8)

Publisher: E. Schweizerbart'sche Verlagsbuchhandlung

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Abstract:

Measurements of tropospheric integrated water vapour (IWV) made with two microwave radiometers (ASMUWARA, TP/WVP-3000), GPS, and radiosondes (SRS 400) during the Temperature, hUmidity, and Cloud (TUC) profiling campaign under mid-latitude conditions in Payerne, Switzerland, in winter 2003/2004 are compared. All methods provide robust IWV retrievals in clear sky and cloudy situations. The mean difference between radiometric and radiosonde IWV is less than 0,15 kgm⁻² being not significant with respect to the standard deviation and to the theoretical accuracy. The GPS IWV measurements have a persistent significant dry bias of approx. 0,5 kgm⁻² with respect to radiometers and radiosondes. The different temporal and spatial resolutions of the instruments were found to have a strong influence on the standard deviation. A characteristic diurnal cycle of the GPS and radiometric IWV was observed.

Document Type: Research article

DOI: 10.1127/0941-2948/2006/0098

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