1. PROJECT ------------ Title: Novel applications of polarimetric radar in mixed-phase clouds and rainfall Dates: 2012 - 2016 Funding organisation: Natural Environment Research Council Grant no.: NE/K 012444/1 and PhD studentship 2. DATASET ------------ Title: Radar data in mixed-phase case studies Description: Range Height Indicator (RHI) scans from 31 January 2014 and 17 February 2016; Doppler spectra from 17 February 2016 as presented in the PhD thesis "Novel applications of polarimetric radar in mixed-phase clouds and rainfall" http://centaur.reading.ac.uk/68712/ and in the article submitted to J. Geophys. Res.: W.J. Keat and C.D. Westbrook (2017) "Revealing layers of pristine oriented crystals embedded within deep ice clouds using differential reflectivity and the copolar correlation coefficient" Publication Year: 2017 Creator: Christopher Westbrook Organisation: University of Reading Rights-holder: University of Reading Source: This data was processed from radar data collected at the Chilbolton Facility for Atmospheric and Radio Research www.chilbolton.stfc.ac.uk/ 3. TERMS OF USE ----------------- This dataset is licensed by the rights-holders under a Creative Commons Attribution 4.0 International Licence: https://creativecommons.org/licenses/by/4.0/ 4. CONTENTS ------------ File listing rhi31jan14.mat - RHI scan from 1501 UTC on 31 January 2014 rhi17feb16.mat - RHI scan from 1156 UTC on 17 February 2016 spec17feb16.mat - Doppler spectra from 1238 UTC on 17 February 2016 All are MATLAB save files created using MATLAB version R2014b 5. METHOD and PROCESSING -------------------------- (a) The RHI radar scans were collected using the Chilbolton Advanced Meteorological Radar (CAMRa) at 75m range resolution. The radar has a 0.28 degree beamwidth. More details on the radar are available from the Chilbolton Facility website www.chilbolton.stfc.ac.uk/ The raw data have been calibrated, and receiver noise has been subtracted. Data with SNR<10dB has been filtered out, consistent with the plots shown in the PhD thesis and paper. Data is in MATLAB .mat format, and the variables are as follows: r = horizontal distance from Chilbolton z = height above ground Zh = radar reflectivity at Horizontal polarisation (copolar) in dBZ ZDR = differential reflectivity in dB L=-log10(1-\rho_{hv}) is a transformed version of the copolar correlation coefficient rho_{hv}. See Keat et al (2016) J. Appl. Meteorol. & Clim. for details SNRperpulseH is the signal to noise ratio of each pixel, on a single pulse, at H polarisation, in linear units SPW_H is the Doppler spectrum width in m/s (b) The Doppler spectra profile from 1238 UTC 17 February 2016 was measured using the 35GHz Copernicus radar at Chilbolton. Raw complex voltages were recorded by the instrument, and processed to produce the spectra provided. The data have 512 velocity bins and the total integration time was 10s. The parameters recorded are: velocity = Doppler velocity of that bin in m/s height = height of range bin above ground spectrum35 = reflectivity of the echo at that range,velocity in dB. The data is the same as used in the PhD thesis of William Keat http://centaur.reading.ac.uk/68712/ and the article submitted to J. Geophys. Res.: W.J. Keat and C.D. Westbrook (2017) "Revealing layers of pristine oriented crystals embedded within deep ice clouds using differential reflectivity and the copolar correlation coefficient". Note that the RHI data are provided in their original resolution as collected, with no smoothing applied.