Disdrometer

Parsivel disdrometer installed at Jülich

The OTT Parsivel² is a laser-based optical system for complete and reliable measurement of all types of precipitation. The size range of measurable liquid precipitation particles is from 0.2 … 5 mm, for solid precipitation particles it is from 0.2 … 25 mm. In the process, precipitation particles can have a velocity of from 0.2 … 20 m/s. The precipitation particles are categorized as follows:

• Drizzle
• Drizzle with rain
• Rain
• Rain, drizzle with snow
• Snow
• Snow grains
• Freezing rain
• Hail

• Temporal resolution 1 minute
• Precipitation amount
• Particle concentration and fall velocity per velocity class and diameter class)
• Equivalent radar reflectivity factor from particle size distribution (6th moment)
• Fall velocity in 32 classes (0.05, 0.15, 0.25, 0.35, 0.45, 0.55, 0.65, 0.75, 0.85, 0.95, 1.1, 1.3, 1.5, 1.7, 1.9, 2.2, 2.6, 3, 3.4, 3.8, 4.4, 5.2, 6, 6.8, 7.6, 8.8, 10.4, 12, 13.6, 15.2, 17.6, 20.8 ms^-1)
• Particle diameter in 32 classes (0.062, 0.187, 0.312, 0.437, 0.562, 0.687, 0.812, 0.937, 1.062, 1.187, 1.375, 1.625, 1.875, 2.125, 2.375, 2.75, 3.25, 3.75, 4.25, 4.75, 5.5, 6.5, 7.5, 8.5, 9.5, 11, 13, 15, 17, 19, 21.5, 24.5 mm)

Data are available on request, please fill the data request sheet and send it to info@joyce.cloud.

Data quicklooks can be found in the JOYCE quicklook browser.

Example time series of Parsivel disdrometer (left: Parsivel drop diameter, fall speed, particle type, precipitation rate / right: rain rates from Parsivel (top), compared to Pluviometer and MRR)