Measurements of Mixing, 13C/12C and D/H Ratios of CH4; Mixing and 13C/12C Ratios of CO and Mixing Ratios of NMHCs from Air Samples Collected Between Los Angeles, CA & Auckland,

CH4 的混合、 13C/12C 和 D/H 比率的测量；

• 批准号: 9909657
• 负责人: Henry Ajie
• 金额: $ 5.09万
• 依托单位: University of California-Irvine
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-08-01 至 2001-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9909657&HistoricalAwards=false
• 关键词: Measurements; Mixing; 13C; 12C; Ratios

Methane (CH4) plays an important role in atmospheric chemistry and greenhouse warming. Its global concentration level has been increasing in recent years and the causes of this increase are not well understood. Surface clean air samples have been collected from a transect of the Pacific Ocean between Los Angeles, California, and Auckland, New Zealand. Under this project, these samples will be analyzed for 13C/12C, D/H, and mixing ratios of CH4, 13C/12C and mixing ratios of carbon monoxide (CO) as well as mixing ratios of selected nonmethane hydrocarbons (NMHC). The results of these measurements will be incorporated into an existing database for atmospheric modeling for constraining the global CH4 budget. These measurements also provide details on the interhemispheric concentration gradients of CH4 and other trace gases as well as information on atmospheric mixing across the Intertropical Conversion Zone (ITCZ), which acts as a buffer controlling movement of air between the Northern and Southern hemispheres

甲烷（CH 4）在大气化学和温室效应中起着重要作用。近年来，其全球浓度水平一直在上升，但对这种上升的原因还不十分了解。从加州的洛杉矶和新西兰的奥克兰之间的太平洋断面上收集了清洁的表面空气样品。在该项目下，将分析这些样品的13 C/12 C、D/H、CH 4混合比、13 C/12 C和一氧化碳（CO）混合比以及选定的非甲烷碳氢化合物（NMHC）混合比。这些测量的结果将被纳入现有的大气建模数据库，以限制全球甲烷预算。这些测量还提供了关于甲烷和其他痕量气体的半球间浓度梯度的详细信息，以及关于热带转换区（ITCZ）大气混合的信息，ITCZ是控制北方和南方半球之间空气运动的缓冲区