FAVOR-HALO: Fast Analysis of Volatile ORganics with gas chromatography/mass spectrometry (GC/MS) on HALO

我们提出了一种新型的快速在线气相色谱仪/质谱仪在HALO上测量挥发性含氧和非含氧有机化合物。挥发性有机化合物是重要的地方和区域大气污染物，因为它们通过形成光化学氧化剂对人类健康、作物和植物产生潜在影响。含氧挥发性有机化合物直接排放到对流层或由非含氧化合物形成。尽管它们对大气过程有很强的影响，但由于分析困难，这些物种的浓度数据仍然很少。在OMO演示任务期间，HALO飞机将对来自污染地区的快速对流空气包裹和来自北美的经过更多处理的空气进行取样，其中含氧挥发物相对于其前体被富集。在OMO示范任务期间测量自由对流层中的挥发性有机化合物将有助于限制不同空气包裹中的自由基化学，评估空气包裹的光化学处理程度或识别来自不同来源的空气包裹。

We propose to measure volatile oxygenated and nonoxygenated organic compounds aboard HALO using a novel fast online gas chromatograph / mass spectrometer. Volatile organic compounds are important local and regional atmospheric pollutants because of their potential impacts on human health, crops and plants by forming photochemical oxidants. Oxygenated volatile organic compounds are directly emitted into the troposphere or formed from nonoxygenated compounds. Despite their strong influence on atmospheric processes, concentration data of these species are still rare due to analytical difficulties. During the OMO demonstration mission, the HALO aircraft will sample rapidly convected air parcels from polluted regions and more processed air from North America with oxygenated volatiles being enriched relative to their precursors. Measuring volatile organic compounds in the free troposphere during the OMO demonstration mission will help to constrain radical chemistry in different air parcels, evaluate the extent of photochemical processing of air parcels or identify air parcels from different origin.