Calibration and Data Quality Control of X-band Dual-Polarimetric Radar On Tibetan Plateau

To study the mechanism of cloud initializing on Tibetan plateau and moving eastward to trigger heavy rainfall in Yangtze river basin in summer, a research project carried on a series of intensive observing campaigns for the cloud on Tibetan plateau from June 1 to August 31, 2019 at Ganzi, Litang, Daocheng and Jiulong in Sichuan province. This paper focuses on the analysis of X-band dual-polarimetric radar data quality control, including ground clutter identification, differential reflectivity ZDR calibration, differential phase Φ
_DP
filtering and attenuation correction of horizontal reflectivity ZH and ZDR. The following conclusion are drawn : (1) the mean ZDR system bias is close to zero using light precipitation measurements at vertical incidence, and the radar system is stable during the experiment; (2) dual polarization parameters can effectively identify ground clutter; (3) benefitting from comprehensive Φ
_DP
process, attenuation of ZH and ZDR are effectively corrected to reflect the characteristics of precipitation particle. The preliminary results will be used in the studies of the parameterization of cloud and precipitation microphysical process and the attenuation correction of millimeter-wavelength cloud radar.