GPM GROUND VALIDATION AUTONOMOUS PARSIVEL UNIT (APU) GCPEX V1

The GPM Ground Validation Autonomous Parsivel Unit (APU) GCPEx dataset was collected by the Autonomous Parsivel Unit (APU), which is an optical disdrometer that measures the size and fall velocity of single precipitation particles. The APU consists of the Parsivel (the precipitation measuring instrument), developed by OTT in Germany, and its support systems, which were designed and built by the University of Alabama in Huntsville. The GPM Cold-season Precipitation Experiment (GCPEx) addressed shortcomings in the GPM snowfall retrieval algorithm by collecting microphysical properties, associated remote sensing observations, and coordinated model simulations of precipitating snow. These data sets were collected to aid in the achievement of the over arching goal of GCPEx which is to characterize the ability of multi-frequency active and passive microwave sensors to detect and estimate falling snow. The APU dataset for GCPEx provides precipitation data including raindrop size, raindrop counts, precipitation drop size, precipitation rate, precipitation amount, and snowflake size, counts and distribution. The GCPEx APU data was collected from several sites in Canada during the Winter 2011-2012 period.

GPM 地面验证自主 Parsivel 单元（APU）GCPEx 数据集由自主 Parsivel 单元（APU）收集而成，该单元是一种光学谱仪，用于测量单个降水粒子的尺寸和下落速度。APU 由德国 OTT 开发的 Parsivel（降水测量仪器）及其支持系统组成，后者由阿拉巴马大学亨茨维尔分校设计和建造。GPM 冷季降水实验（GCPEx）通过收集微物理特性、相关遥感观测以及降水雪的协调模型模拟，解决了 GPM 雪量检索算法的不足。这些数据集的收集旨在协助实现 GCPEx 的总体目标，即描述多频段主动和被动微波传感器检测和估算下落雪的能力。GCPEx APU 数据集提供了包括雨滴尺寸、雨滴计数、降水滴尺寸、降水率、降水量以及雪花尺寸、计数和分布的降水数据。GCPEx APU 数据于 2011-2012 年冬季在加拿大多个地点收集。