kasacrzppiaux (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波段扫描型ARM云雷达（Ka-Band Scanning ARM Cloud Radar, KASACR）用于采集并记录云系相关特性。ARM旗下的扫描型云雷达均为搭载于共用扫描转台的双频双偏振多普勒雷达。每台转台均配备一台Ka波段雷达（峰值功率2kW），且根据部署点位的不同，配套的第二台雷达可为W波段雷达（峰值功率1.7kW）或X波段雷达（峰值功率20kW）。Ka波段与W波段配对使用时，两者的波束宽度大致匹配，约为0.3°；X波段的波束宽度则约为1°。鉴于天线波束宽度极窄，ARM的扫描型云雷达采用了区别于常规天气雷达的扫描策略：KASACR并未侧重平面位置显示器（Plan Position Indicator, PPI）扫描模式，而是在多个方位角下采用距离高度显示器（Range Height Indicator, RHI）扫描模式，以获取云体的三维体积数据。KASACR采集的观测参数包括同极化与交叉极化雷达反射率、多普勒速度、谱宽、非扫描时段的频谱以及线性退极化比。目前，可获取阿根廷地区2018-2019年云、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 b1级产品数据。该b1级产品以原始CACTI业务数据为基础，通过全面的分析与校正实现了数据质量的提升：数据已完成交叉定标至统一基准，针对试验期间出现的业务问题对数据流进行了校正，并集成了多组数据质量掩码与基础衍生数据集。如需了解更多详情，请参阅《CACTI雷达b1级处理报告》。