The WMO Solid Precipitation Measurement Intercomparison was started in the northern hemisphere winter of 1986/87. The field work was carried out in 13 Member countries for seven years. The Intercomparison was the result of Recommendation 17 of the ninth session of the Commission for Instruments and Methods of Observation (CIMO-IX). As in previous WMO intercomparisons of rain gauges, the main objective of this test was to assess national methods of measuring solid precipitation against methods whose accuracy and reliability were known. It included past and current procedures, automated systems and new methods of observation. The experiment was designed to determine especially wind related errors, and wetting and evaporative losses in national methods of measuring solid precipitation. The aim was to derive standard methods for adjusting solid precipitation measurements and to introduce a reference method of solid precipitation measurement for general use to calibrate any type of precipitation gauge. The report is a consolidation of data and information from the most challenging intercomparison organized by WMO so far to determine the in situ performance characteristics of instruments.
Format: Digital (Free), Hard copy (ill., charts)
Tags: Observations ; Precipitation ; Measure ; Northern Hemisphere ; Region II - Asia ; Region IV - North America, Central America and the Caribbean ; Region VI - Europe ; Instruments and Methods of Observation Programme (IMOP) ; IOM 67 Add tag