Reactive, Volatile, and Highly Soluble Constitutents in Liquid Water Clouds

H202被认为是云滴中SO2的重要氧化剂。有证据表明，它可能被卷进了云中，形成于混合良好的边界层顶部。在这些情况下，SO2氧化成硫酸盐不仅取决于SO2/H202的比值，还取决于上面的云空气进入云中的情况。空中实验将在怀俄明州埃尔克山附近进行，同时计划为麋鹿山天文台(EMO)进行实验研究，以使PI能够通过(1)将空气中的H_2O_2测量结果与EMO的地表H_2O_2测量结果进行比较，(2)使用边界层空气和上面的云空气中的示踪剂SF6的机载释放，来研究卷吸过程。在EMO监测示踪剂时，(3)比较潜在温度的垂直分布，以寻找穿越云顶逆温的卷吸证据，以及(4)将在EMO和从飞机上测量的液态水浓度和液滴光谱与凝结过程的绝热模型进行比较。

H202 is believed to be an important oxidant of SO2 in cloud droplets. There is evidence to suggest that it may be entrained into clouds that form at the top of well mixed boundary layers. In these situations SO2 oxidation to sulfate depends not only on the SO2/H202 ratio but also upon the entrainment of above cloud air into the cloud. Airborne experiments will be conducted near Elk Mountain, Wyoming in concert with experimental studies planned for the Elk Mountain Observatory (EMO) to allow the PIs to investigate the entrainment process by (1) comparing airborne H2O2 measurements with surface H2O2 measurements at EMO, (2) using airborne releases of a tracer, SF6, both in the boundary layer air and in the above cloud air, while monitoring the tracer at EMO, (3) comparing vertical profiles of potential temperature for evidence of entrainment across the cloud-capping inversion, and (4) comparing liquid water concentration and droplet spectra, measured at EMO and from aircraft, with an adiabatic model of the condensation process.