IDRA weather radar measurements - day 2012-04-29

Radar range: standard. Max rain level: weak rain. Parent item: IDRA weather radar measurements - month 2012-04 Measuring instrument: IDRA atmospheric radar in CESAR observatory, Cabauw IRCTR has built a high resolution radar system, IDRA (IRCTR Drizzle Radar), aimed at the detailed observation of the spatial and temporal distribution of rainfall and drizzle. The system was placed at the end of August 2007 on top of a 213 m high meteorological tower in the CESAR (Cabauw Experimental Site for Atmospheric Research) observatory in Cabauw, The Netherlands. This location has several advantages: In the first place, an increased sensitivity due to the reduction of the influence of ground clutter. Secondly, it allows direct observation of the horizontal distribution of low level clouds and fog. Finally, the presence of other instruments in the vicinity enhances the understanding of the physical processes in the atmosphere by synergistically combining their measurements. Data from other instruments at CESAR are available at {http://www.cesar-database.nl}. IDRA provides the horizontal distribution of reflectivity, mean Doppler velocity, Doppler spectrum width and polarimetric parameters like differential reflectivity, linear depolarization ratio or specific differential phase. The data collected is freely available to the scientific community.

雷达量程：标准量程。
最大降雨等级：小雨。
父数据集：IDRA气象雷达观测数据——2012年4月。
测量仪器：位于荷兰卡鲍市CESAR（Cabauw大气研究实验场，Cabauw Experimental Site for Atmospheric Research）观测站的IDRA（IRCTR 细雨雷达）大气雷达。

IRCTR搭建了一套高分辨率雷达系统IDRA（IRCTR 细雨雷达），旨在精准观测降雨与细雨的时空分布特征。该系统于2007年8月末部署在荷兰卡鲍市CESAR观测站内一座213米高的气象塔塔顶。

该选址具备多重优势：其一，可降低地面杂波的影响，提升观测灵敏度；其二，可直接观测低层云与雾的水平分布特征；其三，观测站周边搭载了其他观测仪器，通过协同整合多设备的观测数据，可加深对大气物理过程的理解。

CESAR观测站的其他仪器观测数据可通过网址{http://www.cesar-database.nl}获取。

IDRA可提供反射率、平均多普勒速度、多普勒谱宽等雷达回波参数，以及差分反射率、线性退极化比、比差分相位等偏振参数的水平分布数据。所采集的观测数据面向科研群体免费开放。