Correction of raindrop size distributions measured by Parsivel disdrometers, using a two-dimensional video disdrometer as a reference

de.koeln.rrzk/amd.de.hopm/lac.dm00.l1.any SAMD v1.0 en HD(CP)2 hopm_lac_dm00_l1_any HD(CP)2 short term observations, all variables data of Disdrometer (no. 00), HOPE-Melpitz campaign by LACROS, data version 00 LACROS disdrometer data Patric Seifert, seifert@tropos.de Leibniz Institue for Tropospheric Research (TROPOS), Leipzig, Germany. 2017-01-31, 12:18:46 CF-1.6 where applicable external Data acquired with python script parsivel2nc.py Original data converted to hdcp2-conform netcdf via convert_parsivel2hdcp.m NETCDF3_CLASSIC 13 daily 1 For non-commercial use only. This data is subject to the HD(CP)2/SAMD data policy to be found at https://doi.org/10.25592/uhhfdm.9823 and in the HD(CP)2/SAMD Observation Data Product Standard https://doi.org/10.5281/zenodo.1741363. Any usage of the data should be reported to the contact person. none Leibniz Institute for Tropospheric Research, Leipzig Patric Seifert +49 341 2717-7080 seifert@tropos.de 2013-09-07 2013-10-21 30 none none The instrument is part of the LACROS facility that was installed at the TROPOS field site of Melpitz, approximately 40 km NE of Leipzig. The optical disdrometer OTT Parsivel2 observes the size and fall velocity of particles (Variable: raw_data) passing a band laser. From this raw_data measurement, the particle number concentration (variable: number_concentration), fall-velocity spectrum (variable: fall_velocity), total number of particles (Variable: n_particles), precipitation rate (Variable: rainfall_rate), equivalent radar reflectivity factor (Variable: radar_reflectivity), kinetic Energy of the precipitation particles (Variable: E_kin), Visibiilty (Variable: visibility) and two synop codes (Variables: synop_WaWa, synop_WW) are derived. A manual of the disdrometer can be found online on the webpage of the manufacturer at http://www.ott.com none Manual of the OTT Parsivel-2 can be found online at http://www.ott.com OTT Parsivel 2 51.525 12.928 86 2 none Short term observations HOPE-Melpitz Variable groups Atmospheric state Short term observations HOPE-Melpitz Instrument groups Surface meteorology 2015 Raupach, T. H. and A. Berne Correction of raindrop size distributions measured by Parsivel disdrometers, using a two-dimensional video disdrometer as a reference The raindrop size distribution (DSD) quantifies the microstructure of rainfall and is critical to studying precipitation processes. We present a method to improve the accuracy of DSD measurements from Parsivel (particle size and velocity) disdrometers, using a two-dimensional video disdrometer (2DVD) as a reference instrument. Parsivel disdrometers bin raindrops into velocity and equivolume diameter classes, but may misestimate the number of drops per class. In our correction method, drop velocities are corrected with reference to theoretical models of terminal drop velocity. We define a filter for raw disdrometer measurements to remove particles that are unlikely to be plausible raindrops. Drop concentrations are corrected such that on average the Parsivel concentrations match those recorded by a 2DVD. The correction can be trained on and applied to data from both generations of OTT Parsivel disdrometers, and indeed any disdrometer in general. The method was applied to data collected during field campaigns in Mediterranean France for a network of first- and second-generation Parsivel disdrometers, and on a first-generation Parsivel in Payerne, Switzerland. We compared the moments of the resulting DSDs to those of a collocated 2DVD, and the resulting DSD-derived rain rates to collocated rain gauges. The correction improved the accuracy of the moments of the Parsivel DSDs, and in the majority of cases the rain rate match with collocated rain gauges was improved. In addition, the correction was shown to be similar for two different climatologies, suggesting its general applicability. Atmos. Meas. Tech., 8, 343-365, doi:10.5194/amt-8-343-2015 2016 OTT hydromet company Webpage of OTT parsivel2 none http://www.ott.com/en-us/products/meteorological-sensors/ott-parsivel2-laser-weather-sensor/ 2880 2 32 32 lat none latitude Latitude of instrument location degrees_north lon none longitude Longitude of instrument location degrees_east zsl none altitude Altitude of instrument sensor above mean sea level m time time time Unix time at start of data transfer in seconds after 00:00 UTC on 1/1/1970 seconds since 1970-01-01 00:00:00 interval time none Length of measurement interval s diameter diameter none Center diameter of precipitation particles m diameter_spread diameter none Width of diameter interval m velocity velocity none Center fall velocity of precipitation particles m s-1 velocity_spread velocity none Width of velocity interval m s-1 data_raw time, diameter, velocity none Raw data as a function of particle diameter and velocity 1 number_concentration time, diameter none Number of precipitation particles per diameter class log10(m-3 mm-1) fall_velocity time, diameter none Average velocity of preciptation particles of each diameter class m s-1 n_particles time none Number of dtected precipitation particles 1 rainfall_rate time rainfall_rate Precipitation rate m s-1 radar_reflectivity time equivalent_reflectivity_factor equivalent radar reflectivity factor dBZ E_kin time none Kinetic energy of the hydrometeors kJ visibility time none Visibility range in precipitation after MOR m synop_WaWa time none Synop Code WaWa 1 synop_WW time none Synop Code WW 1 T_sensor time none Temperature in the sensor K sig_laser time none Signal amplitude of the laser 1 state_sensor time none State of the Sensor 1 V_sensor time none Sensor Voltage V I_heating time none Heating Current A error_code time none Error Code 1