Measurements of Hydroxyl Radical (OH)/Nitric Acid (HNO3) for Program for Research on Oxidants: Photochemistry, Emissions, and Transport (PROPHET)

一台最近建造的能够测量大气中OH(羟基自由基)、H2SO4(硫酸)和HNO3(硝酸)的仪器将在2001年在密歇根州北部举行的PROPHET(氧化剂研究计划：光化学、排放和运输)夏季密集会议期间部署。该测量技术基于化学电离质谱仪(CIMS)。在早期的先知战役中，使用基于荧光的技术进行的测量显示，夜间可测量到的OH水平令人惊讶。部署这种完全不同的技术可以在先知遗址的条件下确认夜间OH的发生。对硫酸的测量将补充正在进行的气溶胶测量，对硝酸的测量将补充对活性氮(NOY)家族中其他个别化合物的测量。

A recently built instrument capable of measuring atmospheric OH (hydroxyl radical), H2SO4 (sulfuric acid), and HNO3 (nitric acid) will be deployed during the 2001 Summer intensive of PROPHET (Program for Research on Oxidants: Photochemistry, Emissions, and Transport) in Northern Michigan. The measurement technique is based on chemical ionization mass spectrometry (CIMS). In earlier PROPHET campaigns, measurements using a fluorescence-based technique showed the surprising result of measurable levels of OH during the night. Deploying this fundamentally different technique could confirm the occurrence of nighttime OH under the conditions of the PROPHET site. The measurements of H2SO4 will complement ongoing aerosol measurements, and the measurements of HNO3 would complement measurements of other individual compounds in the reactive nitrogen (NOy) family.