GPM GROUND VALIDATION DUAL POLARIZATION RADIOMETER GCPEX

The GPM Ground Validation Dual Polarization Radiometer GCPEx dataset includes brightness temperature measurements at frequencies 90 GHz (not polarized) and 150 GHz (HV-polarized) for the GPM Cold-season Precipitation Experiment (GCPEx) which occurred in Ontario, Canada. GCPEx addressed shortcomings in the GPM snowfall retrieval algorithm by collecting microphysical properties, associated remote sensing observations, and coordinated model simulations of precipitating snow. This dual polarization radiometer (DPR) is sensitive to particle orientation since it observes the brightness temperature difference between the vertical and horizontal polarization channels at 150 GHz, and it is especially important for the retrievals of particle shape and orientation with polarization observations. DPR also has a high sensitivity to the supercooled liquid water in clouds due to the high-frequency window channels. Even though the netCDF data has regular scans, the browse images are only shown at 30 and 150 degrees. Ancillary data was also captured for the internal calibration of the instrument.

GPM 地面验证双极化辐射计 GCPEx 数据集包含 GPM 冷季降水实验（GCPEx）在加拿大安大略省进行时，于 90 GHz（非极化）和 150 GHz（HV 极化）频率下的亮度温度测量数据。GCPEx 通过收集微物理特性、相关遥感观测数据以及降水雪的协调模型模拟，旨在解决 GPM 雪量检索算法的不足。该双极化辐射计（DPR）由于能够在 150 GHz 频率下观测到垂直和水平极化通道之间的亮度温度差异，因此对粒子取向敏感，这对于利用极化观测数据获取粒子形状和取向的检索尤为重要。DPR 还因高频窗口通道而对云中的过冷水具有高灵敏度。尽管 netCDF 数据具有常规扫描，但浏览图像仅在 30 度和 150 度处显示。此外，还捕获了辅助数据，用于仪器的内部校准。