Parallel air temperature measurements at the KNMI observatory in de Bilt (the Netherlands) May 2003 - June 2005

Ministerie van Infrastructuur en Milieu, Koninklijk Nederlands Meteorologisch Instituut, T. Brandsma
De Bilt : KNMI

From May 2003 through June 2005 a field experiment has been carried out at the observatory of KNMI in De Bilt, as part of the KNMI-program ’Hisklim’ (HIStorical CLIMate). The original objectives of the experiment were: (1) to study the representativeness of the current operational air temperature measurement site, and (2) to explore the possibility of using present-day parallel measurements to correct for inhomogeneities, caused by changes in the surroundings and a relocation of the thermometer screen in 1951. At five sites, including the operational site, temperature and wind speed were measured at a height of 1.5 m, using identical instruments and set-up. The temperature differences between the sites have been studied in connection with the local wind speed and other weather variables. Initial results for the period May 2003-April 2004 have already been published in an interim report (Brandsma, 2004).

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(Scientific report = Wetenschappelijk rapport ; WR 2011-01)
With Ref.