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The Ka-band ARM Zenith Radar (KAZR) remotely probes the extent and composition of clouds at millimeter wavelengths. The KAZR is a zenith-pointing Doppler radar that operates at a frequency of approximately 35 GHz. The main purpose of this radar is to determine the first three Doppler moments (reflectivity, vertical velocity, and spectral width) at a range resolution of approximately 30 meters from near-ground to nearly 20 kilometers in altitude. The KAZR replaces the millimeter-wavelength cloud radar (MMCR) and uses a new digital receiver that provides higher spatial and temporal resolution than the MMCR. In addition, spectral artifacts in the data are significantly reduced in the KAZR, allowing researchers to study cloud dynamics much more closely than with the MMCR. KAZR 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ARM天顶雷达（Ka-band ARM Zenith Radar，KAZR）以毫米波频段遥感探测云的分布范围与组成。KAZR是一种天顶指向式多普勒雷达，工作频率约为35吉赫兹。该雷达的核心用途是获取前三个多普勒矩量：反射率、垂直速度与谱宽，其距离分辨率约为30米，探测高度覆盖从近地面至近20千米的范围。KAZR替代了毫米波云雷达（millimeter-wavelength cloud radar，MMCR），并采用了新型数字接收机，相较MMCR具备更高的空间与时间分辨率。此外，KAZR的数据中谱伪影显著减少，使得研究人员能够比使用MMCR时更细致地开展云动力学过程研究。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）外场试验的KAZR数据，目前已以b1级产品形式发布。该b1级产品基于原始CACTI业务数据，经过全面分析与校正后数据质量得到提升：数据已完成交叉标定至统一基准，针对试验期间出现的业务问题对数据流进行了校正，并集成了多套数据质量掩码与基础衍生产品。如需获取更多相关信息，请参阅《CACTI雷达b1级处理报告》。