A fast-response chemical ionization mass spectrometer for in situ measurements of HNO3 in the upper troposphere and lower stratosphere
A fast-response chemical ionization mass spectrometer for in situ measurements of HNO3 in the upper troposphere and lower stratosphere
复制标题
用于原位测量对流层上部和平流层下部 HNO3 的快速响应化学电离质谱仪
DOI：
10.1063/1.1289679
复制
发表时间：
2000
影响因子：
1.6
通讯作者：
D. Fahey
中科院分区：
文献类型：
--
作者：
J. Neuman;R. Gao;M. Schein;S. Ciciora;J. Holecek;T. L. Thompson;R. Winkler;R. McLaughlin;M. Northway;E. Richard;D. Fahey
一种化学电离质谱仪已被研制出来，用于在美国国家航空航天局（NASA）的WB - 57飞机上对对流层上层和平流层下层的硝酸（HNO₃）进行原位测量。通过使用低表面积加热的特氟龙采样入口以及采用离子 - 分子反应的检测技术，实现了对HNO₃的快速且灵敏的测量。在飞行过程中，通过将来自校准的HNO₃渗透源的HNO₃添加到样品气流中来确定对HNO₃的灵敏度，并且通过在采样入口用干燥氮气流置换采样入口处的环境空气来测量仪器背景。在飞行过程中对仪器的温度、压力和气体流量进行控制，以便在不断变化的环境操作条件下保持恒定的检测灵敏度。在1999年美国国家航空航天局对流层顶附近燃烧排放的大气化学任务期间，利用在6至19千米之间获得的HNO₃和臭氧数据对这种新仪器的初始性能进行了评估。这些数据揭示……
A chemical ionization mass spectrometer instrument has been developed for in situ measurements of nitric acid (HNO3) in the upper troposphere and lower stratosphere from the NASA WB-57 aircraft. Fast and sensitive measurements of HNO3 are achieved by using a low surface area heated Teflon sampling inlet and detection techniques that employ ion-molecule reactions. Sensitivity to HNO3 is determined in flight by adding HNO3 from a calibrated HNO3 permeation source into the sample air flow, and instrument background is measured by displacing ambient air from the sampling inlet with a flow of dry nitrogen in the sampling inlet. Instrument temperatures, pressures, and gas flows are controlled in flight to maintain a constant detection sensitivity in a changing ambient operating environment. The initial performance of this new instrument is evaluated using HNO3 and ozone data obtained between 6 and 19 km during the 1999 NASA Atmospheric Chemistry of Combustion Emissions Near the Tropopause mission. The data reve...