HCR Measurements and products

HCR data are provided in CfRadial format (NetCDF). The resolution is ~20 m in range and 0.1 s in time. In addition to the standard radar moments, such as reflectivity, radial velocity, and spectrum width, HCR also provides the dual-pol linear depolarization ratio. Several derived products, such as melting layer altitude, convectivity and convective/stratiform echo type, and hydrometeor particle type, are also part of the standard HCR data sets. External datasets, such as ERA5 reanalysis data or topography data, are also provided. The data undergoes a rigorous quality control process. Time series In-phase and Quadrature (I and Q) data are available. The following table lists the data variables most commonly used.

Variable Dimension Unit  
time time s Seconds since volume start
range range m Range from instrument to center of gate
elevation time deg Ray elevation angle
FLAG time x range   Quality flag
Radar observations
DBZ time x range dBZ Reflectivity
VEL time x range m/s Doppler velocity
WIDTH time x range m/s Spectrum width
LDR time x range dB Linear depolarization ratio
Derived products
MELTING_LAYER time x range   Melting layer flag
CONVECTIVITY time x range   Convectivity (from 0 [stratiform] to 1 [convective])
ECHO_TYPE time x range   Convective/stratiform echo type
PID time x range   Hydrometeor particle ID
External variables
PRESS time x range hPa ERA5 pressure
TEMP time x range C ERA5 temperature
RH time x range % ERA5 relative humidity
TOPO time m GTOPO30 terrain elevation

Data example from the OTREC field campaign

Example of HCR variables.