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Theo Brandsma Royal Netherlands Met e orological Institute (KNMI)

Understanding of inter-site temperature differences at the KNMI terrain in De Bilt (the Netherlands). Theo Brandsma Royal Netherlands Met e orological Institute (KNMI). 6th Seminar for homogenization and qualtity control in climatological databases COST-HOME meeting

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Theo Brandsma Royal Netherlands Met e orological Institute (KNMI)

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  1. Understanding of inter-site temperature differences at the KNMI terrain in De Bilt (the Netherlands) Theo Brandsma Royal Netherlands Meteorological Institute (KNMI) 6th Seminar for homogenization and qualtity control in climatological databases COST-HOME meeting Budapest, Hungary, 26-30 May 2008

  2. Background Contents • Background and methodology • Results • Overview of causes for inter-site temperature differences

  3. Background and methodology KNMI terrain at De Bilt

  4. Background and methodology KNMI terrain at De Bilt (After the renovation of the nature area in Sep/Oct 2004)

  5. Background and methodology Obstacle altitude

  6. Background and methodology Instruments

  7. Renovation Results Daily maximum temperature

  8. Renovation Results Daily minimum temperature

  9. Results Diurnal cycle

  10. Results Diurnal cycle

  11. Results Wind direction dependence

  12. Overview of causes for inter-site temperature differences • Advection of warm/cold air related to local soil type/groundwater level differences • Local stability differences (especially for W < 1.0 m/s) • Screen ventilation differences (radiation error) • Sky-view factor/horizon differences • Radiation by surrounding objects • Instrumental errors

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