IDRA weather radar measurements - day 2009-12-08

Radar range: standard. Max rain level: moderate rain. Parent item: IDRA weather radar measurements - month 2009-12 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。
最大降雨等级：中雨。
父项：IDRA天气雷达测量数据 - 2009年12月
测量仪器：位于荷兰卡鲍（Cabauw）CESAR观测站内的IDRA大气雷达

IRCTR构建了一套高分辨率雷达系统IDRA（IRCTR毛毛雨雷达），旨在详细观测降雨和毛毛雨的时空分布。该系统于2007年8月底安装在荷兰卡鲍（Cabauw）CESAR（Cabauw大气研究实验站）观测站内一座213米高的气象塔顶部。该位置具有若干优势：首先，由于地物杂波（ground clutter）的影响减小，雷达灵敏度得以提升；其次，可直接观测低层云和雾的水平分布；最后，附近其他仪器的存在可通过协同整合各仪器的观测数据，提升对大气物理过程的理解。CESAR站内其他仪器的数据可通过{http://www.cesar-database.nl}获取。

IDRA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）以及极化参数（polarimetric parameters），如差分反射率（differential reflectivity）、线性退偏比（linear depolarization ratio）和比差分相位（specific differential phase）。所收集的数据向科学界免费开放。