Nature and Cycling of Carbonyl Compounds in the Remote Atmosphere

羰基化合物在大气的光化学和有机化学中起着核心作用，但人们对它们的浓度和循环知之甚少。过去对偏远地区清洁空气中的羰基化合物的几乎所有测量都仅限于甲醛，尽管其他羰基化合物的浓度可能与甲醛相似或更高。该项目的主要目标是阐明遥远的对流层中各种羰基化合物的主要来源和汇，并量化这些化合物在对流层化学中的作用。为了实现这些目标，PI计划对气体和水相中的羰基化合物的本底浓度进行密集测量，并研究它们在化学和气象条件下的变化。这项工作将作为莫纳罗亚天文台光化学实验II的一部分进行。在该计划期间对关键化合物和参数的同时测量将提供模拟对流层化学过程所需的重要新信息，这反过来将为了解羰基化合物在对流层化学中的相对重要性提供新的见解。

Carbonyl compounds play central roles in the photochemistry and organic chemistry of the atmosphere, but little is known about their concentrations and cycling. Nearly all past measurements of carbonyl compounds in clean air over remote regions were restricted to formaldehyde, even though other carbonyl compounds were probably present at similar or higher concentrations. The main objectives in this project are to elucidate the major sources and sinks of a wide variety of carbonyl compounds in the remote troposphere and to quantify these roles in tropospheric chemistry. To achieve these goals, the PI plans to perform intensive measurements of background concentrations of gas and aqueous phase carbonyl compounds, and to study their variations with respect to chemical and meteorological conditions. The work will be carried out as a part of the Mauna Loa Observatory Photochemistry Experiment II. The simultaneous measurements of key compounds and parameters during this program will provide significant new information needed for modeling tropospheric chemical processes, which in turn will provide new insights into the relative importance of carbonyl compounds in tropospheric chemistry.