IDRA weather radar measurements - day 2011-09-27

Radar range: standard. Max rain level: weak rain. Parent item: IDRA weather radar measurements - month 2011-09 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。父数据集项：IDRA气象雷达观测数据——2011年9月。观测仪器为位于荷兰卡堡CESAR（卡堡大气研究实验站点，Cabauw Experimental Site for Atmospheric Research）天文台的IDRA大气雷达。IRCTR研制了高分辨率雷达系统IDRA（IRCTR毛毛雨雷达，IRCTR Drizzle Radar），旨在精细化观测降雨与毛毛雨的时空分布特征。该系统于2007年8月底部署于荷兰卡堡市CESAR天文台内一座213米高的气象铁塔顶端。该观测点位具备多重优势：其一，可降低地面杂波干扰，提升观测灵敏度；其二，可直接获取低层云与雾的水平分布信息；其三，周边配套的其他观测仪器可与本系统协同融合观测数据，通过多源联合分析深化对大气物理过程的认知。CESAR天文台其他仪器的观测数据可通过{http://www.cesar-database.nl}获取。IDRA系统可提供反射率（reflectivity）、平均多普勒速度（mean Doppler velocity）、多普勒谱宽（Doppler spectrum width）的水平分布数据，以及差分反射率（differential reflectivity）、线性退极化比（linear depolarization ratio）、比差分相位（specific differential phase）等偏振参数。本次采集的观测数据面向科研界免费开放。