PAR002 Optical disdrometer data at Cabauw

<strong>Description:</strong> In-situ measurements of raindrop size distributions, fall velocities, drop number concentrations and surface rain rates recorded by an OTT Parsivel2 disdrometer named "PAR002" at the remote sensing site in Cabauw. Note that "PAR002" is co-located with another identical disdrometer called "PAR001". This co-location can be used to cross-check data, perform quality control and/or assess measurement uncertainty due to sensor calibration, random sampling effects and environmental effects such as wind speed/direction which are known to substantially affect the accuracy of optical disdrometers.<br><strong>Format:</strong> Each NetCDF file covers a full month of observations. The temporal resolution is 1 minute. Data are provided "as is", without any post-processing. The NetCDF files contain all relevant information about all the variables, attributes and units. The global attributes of the NetCDF files contain important information about the type of sensor, logging software, project contributors and history of the dataset. If a monthly file is missing, no data are available for this month.<br><strong>Relevance:</strong> Optical disdrometer data are useful for studying the type, dynamics and microphysics of precipitation from the perspective of a fixed observer on the ground. The data can be used to help calibrate weather radars, improve quantitative precipitation estimates, calculate the absorption/attenuation/propagation of electromagnetic signals through the atmosphere, and quantify important physical quantities such as liquid water content, rain amount, intensity and kinetic energy.<br><strong>Notes:</strong> This dataset is updated approximately every 3 months. Please reach out to the authors for access to the most recent data.<br><strong>Known issues:</strong>In 2021, connectivity issues resulted in the loss of data from June 2-21, July 14 to August 11, and September 21 to October 5.In 2022, the data from August 6-13 are missing.In 2023, the data from June 16-20 are missing.Between November 8 and December 22, 2023, no data are available due to a major upgrade in the data logging system.In 2024, the data from February 5-11 are missing.

数据集说明：本数据集收录了位于卡堡（Cabauw）遥感站点的编号为"PAR002"的OTT Parsivel2激光雨滴谱仪（OTT Parsivel2 disdrometer）所采集的雨滴尺寸分布、下落末速度、雨滴数浓度及地面降雨率的原位测量数据。请注意，"PAR002"与另一台型号相同的编号为"PAR001"的激光雨滴谱仪进行了同址布设。这种同址布设方案可用于交叉校验数据、开展质量控制，或评估因传感器校准、随机采样效应以及风速/风向等环境因素导致的测量不确定度——已知上述因素均会显著影响光学雨滴谱仪的测量精度。
数据格式：每份网络通用数据格式（NetCDF）文件涵盖一整月的观测数据，时间分辨率为1分钟。数据按"原样"提供，未经过任何后处理。NetCDF文件包含所有相关变量、属性及单位的完整信息。NetCDF文件的全局属性中包含了传感器类型、日志软件、项目贡献者以及数据集历史等重要信息。若某一月份的文件缺失，则表示该月份无可用数据。
数据集应用价值：光学雨滴谱仪数据可用于从地面固定观测视角，研究降水的类型、动力学特性与微物理过程。该数据可用于辅助校准天气雷达、改进定量降水估测、计算电磁信号在大气中的吸收/衰减/传播特性，并可量化液态水含量、降雨量、降雨强度及动能等重要物理量。
备注：本数据集约每3个月更新一次。如需获取最新数据，请联系数据集作者。
已知问题：2021年，因连接故障导致6月2日至21日、7月14日至8月11日以及9月21日至10月5日的数据丢失；2022年8月6日至13日的数据缺失；2023年6月16日至20日的数据缺失；2023年11月8日至12月22日期间，因数据日志系统进行重大升级，无可用数据；2024年2月5日至11日的数据缺失。