Ka-Band ARM Zenith RADAR (KAZR) CF-Radial Spectral Data, moderate sensitivity mode, co-polarized mode - kazrcfrspcmdcopol

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. \n \nThe 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. \n \nKAZR 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）通过毫米波频段遥感探测云的分布范围与组成。KAZR是一款指向天顶的多普勒雷达，工作频率约为35 GHz。该雷达的核心功能是在约30米的距离分辨率下，从近地面至近20千米的高空范围内，获取前三个多普勒矩量：反射率、垂直速度与谱宽。

KAZR替代了毫米波云雷达（millimeter-wavelength cloud radar，MMCR），并搭载了全新的数字接收机，相较MMCR具备更优的空间与时间分辨率。此外，KAZR的数据中频谱伪影显著减少，使得研究人员可相较于使用MMCR时，更精细地开展云动力学相关研究。

目前，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）外场观测试验所获取的KAZR数据，已以b1级产品形式对外发布。该b1级产品基于原始CACTI业务数据，通过全面的分析与校正实现了数据质量提升：数据以统一基准点为参照完成交叉校准，针对试验期间出现的业务运行问题完成了数据流校正，并集成了多套数据质量掩码及基础衍生产品。如需获取更多详细信息，请参阅《CACTI雷达b1级处理报告》。