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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
Understanding of inter-site temperature differences at
the KNMI terrain in De Bilt (the Netherlands)
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Contents
Background and methodology
Results
Overview of causes for inter-site temperature
differences
Background
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KNMI terrain at De Bilt
Background and methodology
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KNMI terrain at De Bilt
Background and methodology
(After the renovation of the nature area in Sep/Oct 2004)
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Obstacle altitudeBackground and methodology
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InstrumentsBackground and methodology
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Daily maximum temperature
Results
Renovation
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Daily minimum temperature
Results
Renovation
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Diurnal cycle
Results
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Diurnal cycle
Results
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Wind direction dependence
Results
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Overview of causes for inter-site temperature differences
1. Advection of warm/cold air related to local soil type/groundwater level differences
2. Local stability differences (especially for W < 1.0 m/s)
3. Screen ventilation differences (radiation error)
4. Sky-view factor/horizon differences
5. Radiation by surrounding objects
6. Instrumental errors