NAMMA HIGH ALTITUDE MMIC SOUNDING RADIOMETER (HAMSR) V1

The NAMMA High Altitude MMIC Sounding Radiometer (HAMSR) dataset consists of data collected by HAMSR, which is a 25-channel microwave atmospheric sounder operating as a cross-track scanner. It operates with three bands: an 8-channel band centered around 50 GHz, used for primary temperature sounding; a 10-channel band centered around 118 GHz, used for secondary temperature sounding and assessment of scattering; and a 7-channel band centered around 183 GHz, used for water vapor (humidity) sounding. The instrument continuously self-calibrates by using internal calibration targets. Radiometric sensitivity at the composite sampling cells provided in the archive is typically 0.1 K and ranges up to 0.25 K for the stratospheric channels. Calibration accuracy is estimated at better than 1 K for temperature sounding and better than 2 K for water vapor sounding. Temperature weighting function peaks are distributed between the surface and the flight altitude. These data files were generated during support of the NASA African Monsoon Multidisciplinary Analyses (NAMMA) campaign, a field research investigation sponsored by the Science Mission Directorate of the National Aeronautics and Space Administration (NASA). This mission was based in the Cape Verde Islands, 350 miles off the coast of Senegal in west Africa. Commencing in August 2006, NASA scientists employed surface observation networks and aircraft to characterize the evolution and structure of African Easterly Waves (AEWs) and Mesoscale Convective Systems over continental western Africa, and their associated impacts on regional water and energy budgets.

NAMMA 高空毫米波辐射计（HAMSR）数据集由 HAMSR 收集而成，HAMSR 是一种25通道微波大气探测仪，以交叉轨道扫描模式运行。该仪器运行于三个频段：一个以50 GHz为中心的8通道频段，用于主要温度探测；一个以118 GHz为中心的10通道频段，用于次级温度探测和散射评估；以及一个以183 GHz为中心的7通道频段，用于水汽（湿度）探测。仪器通过使用内部校准目标进行连续自校准。在档案提供的复合采样单元中，辐射灵敏度通常为0.1 K，对平流层通道可达0.25 K。校准精度估计对于温度探测优于1 K，对于水汽探测优于2 K。温度加权函数峰值分布在地表与飞行高度之间。这些数据文件是在支持美国国家航空航天局（NASA）非洲季风多学科分析（NAMMA）活动期间生成的，该活动是由国家航空航天局（NASA）科学任务局资助的现场研究调查。该任务位于西非塞内加尔海岸350英里外的佛得角群岛。自2006年8月开始，NASA科学家利用地面观测网络和飞机来表征西非大陆东波（AEWs）和中尺度对流系统（MESOSCALE CONVECTIVE SYSTEMS）的演化和结构，以及它们对区域水资源和能源预算的相关影响。