NAMMA DIODE LASER HYGROMETER (DLH) V1

The NAMMA Diode Laser Hygrometer (DLH) dataset uses the DLH, a near-infrared spectrometer operating from aircraft platforms, was developed by NASA's Langley and Ames Research Centers. It measures water vapor mixing ratio and derives water vapor partial pressure, relative humidity, and water vapor flux. Based upon near-infrared tunable diode technology, its spectrometer provides true in situ monitoring of water vapor concentrations with precision levels exceeding those of existing Lyman alpha and frost point hygrometers. 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二极管激光湿度计（DLH）数据集采用了由美国国家航空航天局（NASA）的兰利和艾姆斯研究中心开发的DLH近红外光谱仪，该仪器可在机载平台上运行。该数据集测量水汽混合比，并推导出水汽分压、相对湿度和水汽通量。基于近红外可调二极管技术，其光谱仪能够提供精确的现场水汽浓度监测，其精度远超现有的拉曼α线湿度计和露点湿度计。这些数据文件是在支持NASA非洲季风多学科分析（NAMMA）活动中生成的，该活动是一项由美国国家航空航天局（NASA）科学任务局资助的实地研究调查。此次任务以佛得角群岛为基地，位于西非塞内加尔海岸350英里之外。自2006年8月起，NASA科学家利用地表观测网络和飞机来描述非洲东风波（AEWs）和中尺度对流系统在非洲西部大陆上的演变和结构，以及它们对区域水和能量收支的影响。