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THE NERC MST RADAR FACILITY AT ABERYSTWYTH
SURFACE METEOROLOGICAL SENSORS
Surface meteorological parameters (i.e. air temperature, pressure and
relative humidity, and rainfall and downwelling shortwave radiation)
are recorded at 10 minute intervals at the NERC MST radar site
(52.42°N, -4.01°E, 50 m above mean sea level; British National
Grid Reference: SN637826). Data are available from 25th July 2000 to
the present. There are a number of gaps in the dataset owing to
instrument problems and down-time for maintenance. |
Data are recorded with a (Met Office approved) CR10 "Climate Data Logger" from Campbell Scientific using the following sensors:
The data logger initially samples the atmospheric temperature, pressure and humidity sensors at 5 s intervals. Mean values are calculated over each 60 s and the outputs from the logger represent minima, means and maxima of these 60 s means over each 10 minute sample period.
The data logger initially samples the tipping bucket raingauge every 1 s and records a tip for each 0.20 mm accumulation of rain. The output from the logger represents the total accumulation of rain over the each 10 minute sample period.
The data logger initially samples the pyranometer every 5 s and records the downwelling radiation (within a hemispheric field of view) with a flat response in the spectral range 305 - 2800 nm. The output from the logger represents the accumulation of energy per unit area within each 10 minute sample period. The measured radiation is compared with that predicted for the logger's latitude and longitude, and for the time of year and the time of day (assuming clear sky conditions). A sunshine priod is defined as one in which the ratio excedes 0.4 and the output from the logger represents the accumulated sunshine duration within each 10 minute sample period. Note that this is an estimated product, which is not derived according to the WMO definition of sunshine duration.
The data logger records the instantaneous battery voltage and internal temperature at the end of each 10 minute sample period for performance checking purposes.
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Last updated 1st February 2006