Recent research on meteorological observations and instrumentation at KNMI
Some recent research topics are:
• Improvement of cloud (cover) observations. A scanning pyrometer has been evaluated, in order to improve on the automated cloud cover reports obtained by using cloud base data from ceilometers.
• Visibility standard. A visibility standard has been developed to calibrate the forward-scatter sensors used in the network. Field calibration of a reference forward-scatter sensor against a transmissometer has been implemented, according to ICAO regulations.
• Improvement of precipitation type detection. Precipitation type determined by the forward scatter sensors shows some weaknesses, e.g. around 0 °C and in detecting hail events. The performance of several other sensors, most notably two types of optical disdrometers, is evaluated.
The results of these (ongoing) studies will be shown.