kasacrvptaux (a0)

The Ka-Band Scanning ARM Cloud Radar (KASACR) records cloud properties. ARM's scanning cloud radars are dual-frequency, dual-polarization Doppler radars mounted on a common scanning pedestal. Each pedestal includes a Ka-band radar (2kW peak power) and the deployment location determines whether the second radar is a W-band (1.7 kW peak power) or an X-band (20 kW peak power). Beamwidths for Ka-bands paired with W-bands are roughly matched at 0.3 degrees. The X-band beamwidth is approximately 1 degree. Due to the narrow antenna beamwidth, ARM’s scanning cloud radars use scanning strategies unlike typical weather radars. Rather than focusing on plan position indicator, or PPI, scans, the KASACR uses range height indicator, or RHI, scans at numerous azimuths to obtain cloud volume data. Measurements collected with the KASACR are copolar and cross-polar radar reflectivity, Doppler velocity, spectra width and spectra when not scanning, and linear depolarization ratio. KASACR data from the 2018–2019 Cloud, Aerosol, and Complex Terrain Interactions (CACTI) field campaign in Argentina are now available as b1-level products. Building on the original CACTI operational data, the b1-level products feature improved data quality resulting from extensive analyses and corrections. The data are cross-calibrated to a common point, datastreams are corrected for operational issues that occurred during the campaign, and several data quality masks and basic derived products are incorporated. For more information, read the CACTI radar b1-level processing report.Ka波段扫描ARM云雷达（Ka-Band Scanning ARM Cloud Radar，KASACR）用于记录云体特性。ARM的扫描云雷达均为搭载于共用扫描转台的双频双极化多普勒雷达。每台转台均配备一台Ka波段雷达（峰值功率2千瓦），第二台雷达的波段则由部署地点决定，可为W波段（峰值功率1.7千瓦）或X波段（峰值功率20千瓦）。Ka波段与W波段配对时的波束宽度均约为0.3度，X波段的波束宽度约为1度。由于天线波束宽度较窄，ARM的扫描云雷达采用了与常规天气雷达截然不同的扫描策略。KASACR并未侧重平面位置显示器（plan position indicator，PPI）扫描，而是在多个方位角方向上采用距离高度显示器（range height indicator，RHI）扫描以获取完整云体数据。KASACR采集的测量数据包括同极化与交叉极化雷达反射率、多普勒速度、谱宽、非扫描模式下的频谱以及线性退极化比。2018至2019年在阿根廷开展的云、气溶胶与复杂地形相互作用（Cloud, Aerosol, and Complex Terrain Interactions，CACTI）野外试验的KASACR数据，现已以b1级产品（b1-level products）形式发布。在原始CACTI业务数据基础上，b1级产品通过大量分析与校正工作提升了数据质量：数据已统一校准至同一基准点，针对试验期间出现的业务运行问题对数据流进行了校正，并集成了多套数据质量掩码以及基础衍生产品。更多详情请参阅《CACTI雷达b1级处理报告》。