The Micro Rain Radar (MRR) is a vertical pointing FM-CW (frequency modulated –continuous wave) Doppler radar operating at 24.1 GHz (K-band, 12.4 mm wavelength). The emitted radar signal (only 50 mW transmitting power) is backscattered by falling hydrometeors (rain, graupel, snow). From the Doppler spectra the radar reflectivity factor (Ze) and the terminal fall velocity distribution can be derived.
In case of rain the Doppler spectra can be used to derive vertical profiles of microphysical rain properties like drop size distribution and rain rate.
The MRR system was also studied for its potential to observe snowfall (Kneifel et al., 2011). Also, an improved MRR algorithm IMProToo most suitable for snowfall observations has been developed at IGMK (Maahn and Kollias, 2012). It is freely available on Github.
|Dataset||Temporal resolution||File size||Filename||Remarks|
|Raw data (ASCII)||10 seconds||1 file per day (~15 MB)||YYYYMMDD_jue_mrr_raw_txt.gz||METEK format (zipped)|
|IMProToo (NetCDF)||1 minute||1 file per day (20-30 MB)||YYYYMMDD_jue_mrr_improtoo_0-101.nc.gz||IMProToo product (zipped)|
Both available datasets include Doppler spectra, drop spectra, radar reflectivity, rain rate, and fall velocity.
Data quicklooks can be found in the JOYCE quicklook browser.
|Transmit Power||50 mW|
|Power consumption (radar)||25 W|
|Total power cons. incl heating||525 W|
|Max. range||6 km|
|Range Resolution||10-200 m|
|No. of range gates||30|
|Temporal resolution||10 s|
|Antenna diameter||0.5 m|
|Beam width (2-way, 6 dB)||1.5°|