Ka ARM Zenith Radar (KAZR): filtered spectral data, general mode, cross-polarized mode - kazrspeccmaskgexpol

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，简称KAZR）通过毫米波长对云的分布与组成进行遥感探测。KAZR是一台天顶指向型多普勒雷达，工作频率约为35吉赫（GHz）。该雷达的核心功能是获取距离分辨率约30米、高度覆盖近地面至近20千米处的前三个多普勒矩量：反射率、垂直速度与谱宽。

KAZR替代了毫米波长云雷达（millimeter-wavelength cloud radar，简称MMCR），并搭载了全新的数字接收机，其空间与时间分辨率均优于MMCR。此外，KAZR可显著抑制数据中的频谱伪影，使研究人员能够比使用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，简称CACTI）野外试验所获取的KAZR数据，已以b1级产品形式对外发布。相较于原始CACTI业务数据，b1级产品通过全面的分析与校正实现了数据质量的提升：数据已完成统一交叉定标，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与基础衍生产品。如需了解更多详细信息，请参阅《CACTI雷达b1级处理报告》。