Ka ARM Zenith Radar (KAZR): auxiliary data - kazraux

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）借助毫米波频段实现云分布范围与组成的遥感探测。KAZR为天顶指向型多普勒雷达，工作频率约为35吉赫兹（GHz）。该雷达的核心目标是在近地面至近20千米的高度范围内，以约30米的距离分辨率，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），并采用全新的数字接收机，其空间与时间分辨率均优于MMCR。此外，KAZR可显著降低数据中的频谱伪影，令研究人员能够比使用MMCR时更细致地开展云动力学相关研究。

来自2018至2019年阿根廷开展的“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KAZR数据，现已以b1级产品形式发布。该b1级产品基于原始CACTI业务化数据，经过全面分析与校正后数据质量得到显著提升：数据已完成交叉定标至统一基准点，针对试验期间出现的业务问题对数据流进行了修正，并集成了多套数据质量掩码及基础衍生产品。如需了解更多细节，请参阅《CACTI雷达b1级处理报告》。