kasacrcfrmfpt (a1)

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）用于记录云属性参数。ARM扫描型云雷达为搭载于共用扫描转台的双频双极化多普勒雷达，每套转台集成一台Ka波段雷达（峰值功率2kW），而根据部署场地的不同，第二台雷达可为W波段（峰值功率1.7kW）或X波段（峰值功率20kW）。Ka波段与W波段配对时的波束宽度大致匹配，约为0.3°；X波段波束宽度约为1°。由于天线波束宽度极窄，ARM扫描型云雷达采用与常规天气雷达不同的扫描策略：KASACR并未聚焦于平面位置显示器（Plan Position Indicator, PPI）扫描模式，而是在多个方位角上采用距离高度显示器（Range Height Indicator, RHI）扫描模式，以获取云体三维体积数据。KASACR采集的测量参数包括同极化与交叉极化雷达反射率、多普勒速度、谱宽、非扫描状态下的雷达频谱，以及线性退极化比。目前，2018-2019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）野外试验所获取的KASACR数据已以b1级产品形式发布。该b1级产品基于原始CACTI业务数据，通过大量分析与校正工作提升了数据质量：完成了跨基准点交叉定标，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产品。如需了解更多细节，请参阅《CACTI雷达b1级处理报告》。

搜集汇总

背景与挑战

背景概述

该数据集是Ka波段扫描ARM云雷达（KASACR）在固定指向模式下收集的a1级别数据，主要用于云属性研究，包括雷达多普勒、极化和反射率测量。它源自阿根廷科尔多瓦的移动设施，是云、气溶胶和复杂地形相互作用（CACTI）活动的一部分，专注于云宏观和微观物理特性的分析。