Tropospheric Organic Matter: Characterization of OxygenatedCompounds of Biogenic Versus Thermogenic Origins

这笔赠款用于对世界不同地区在代表典型植物群落的地点收集的空气中的细颗粒物进行实验室分析。作为对同一调查员早先的工作的补充，其中碳氢化合物类型是实验室分析的主要对象，目前的项目将侧重于在早先的现场采样工作之后储存长达十年的相同样品中含氧物种的分析。这项研究的一个重要内容是确定“化学特征”，即从植物群落的植被中自然释放的植物蜡的组成，以表征世界各地的区域范围。有些样品既代表了人为燃烧源，也代表了自然燃烧源。这项研究将进一步确定对流层空气中颗粒物的有机化学，并将提供有关已知区域来源的颗粒物化学的数据，用于追踪大气传输路径。

The grant provides for the laboratory analysis of airborne fine particles collected in different regions of the world at locations representative of characteristic vegetational communities. Complementing earlier work by the same investigator in which hydrocarbon types were the prime object of the laboratory analyses, the current project will emphasize the analysis of the oxygen-bearing species in the same samples stored up to ten years following earlier field- sampling operations. An important element of the research is the identification of "chemical signatures" in terms of the composition of plant waxes naturally released from the vegetation of plant communities characterizing areas of regional extent around the world. Some samples are included to represent both anthropogenic and natural combustion sources. The research will further define the organic chemistry of airborne particulate matter in the troposphere, and it will provide data on the chemistry of particulates from known regional origins for use in tracing atmospheric transport pathways.