Hydrocarbon Trace Gases in ASTEX/MAGE

ASTEX/MAGE 中的碳氢化合物痕量气体

• 批准号: 9121739
• 负责人: F. Sherwood Rowland
• 金额: $ 25.78万
• 依托单位: University of California-Irvine
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-04-15 至 1994-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9121739&HistoricalAwards=false
• 关键词: Hydrocarbon; Trace; Gases; ASTEX; MAGE

In this Mage proposal, the PIs propose to determine the hydrocarbon and hydrocarbon composition of air samples collected during the ASTEX/MAGE campaign. Proposed measurements include approximately 25 chlorocarbon compounds containing one or two carbon atoms and 50 or more hydrocarbons ranging in molecular weight from methane to the terpenes (C4 - C10). The overall objective is to provide information for the construction and testing of detailed photochemical models to examine the chemical cycles controlling each of the measured species and of the unmeasured reactive free radicals such as OH and Cl. The Pis propose to set up a remote laboratory in Miami, Florida where gas chromatographic analyses of grab samples obtained from aircraft will be conducted. (Note: this is a change from the originally proposed remote site of Santa Maria; see new work statement and budget sheets.) In this MAGE proposal the PIs plan to determine the hydrocarbon and halocarbon composition of air samples collected during the ASTEX/MAGE campaign. With knowledge of these concentrations, detailed photochemical models can be constructed and tested for the chemical cycles controlling each of the measured species, and also of the unmeasured reactive free radicals such as HO and Cl. Specifically, the measurements will provide data (or upper limits) on the concentrations of approximately 25 chlorocarbon compounds containing one or two carbon atoms and numerous hydrocarbons. In particular, the chlorofluorocarbon compounds and carbon tetrachloride are very long-lived (50 years) in the atmosphere and are entirely anthropogenic. These compounds are excellent markers for air contaminated by recent injections from urban or industrial areas. Shorter-lived chlorocarbons are also excellent markers of anthropogenic activity, and the correlations among such species are useful for distinguishing between air masses mixed from multiple urban sources and homogeneous air masses subjected to different HO radical exposures. Additionally, several alkanes appear to have their primary origin in anthropogenic activities, and on occasion furnish through multiple correlations enough information to identify particular source regions.

在这个法师提案中，PI建议确定 空气样本碳氢化合物及碳氢化合物成分 在ASTEX/法师活动期间。 建议的措施包括 大约25种氯碳化合物， 碳原子和50个或更多的碳氢化合物， 从甲烷到萜烯（C4 - C10）的重量。 整体 目的是为施工提供信息， 测试详细的光化学模型， 循环控制每个被测量的物种和 未测量的活性自由基，如OH和Cl。 法律与正义党 建议在佛罗里达的迈阿密建立一个远程实验室， 从飞机上抓取的样品的色谱分析 将进行。 (Note：这是一个变化，从原来的 拟议的圣玛利亚偏远地点;见新的工作说明和 预算表）。 在本法师提案中，PI计划确定 空气样本的碳氢化合物及卤化碳成分 在ASTEX/法师活动期间。 了解这些 浓度，可以构建详细的光化学模型 并测试控制每个测量的化学循环， 物种，以及未测量的活性自由基，如 HO和Cl. 具体而言，测量将提供数据（或 上限）的浓度约为25 含有一个或两个碳原子的氯碳化合物， 许多碳氢化合物。 特别是氯氟烃 化合物和四氯化碳的寿命非常长（50年） 在大气中，完全是人为的。 这些化合物 是最近注射污染空气的极好标记 从城市或工业区。 寿命较短的氯碳化合物 也是人类活动的优秀标志， 这些物种之间的相关性有助于区分 来自多个城市来源的混合气团之间， 受不同HO自由基影响的均匀气团 暴露。 此外，几种烷烃似乎具有它们的 主要来源于人类活动，有时还提供 通过多重相关性， 特别是来源地。