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,

甲烷（CH4）在大气化学和温室增温中起着重要作用。近年来，其全球浓度水平一直在上升，而这种上升的原因尚不清楚。从加利福尼亚州洛杉矶和新西兰奥克兰之间的太平洋的一个样带中收集了表面清洁空气样本。本项目将对这些样品进行13C/12C、D/H、CH4混合比、13C/12C混合比、一氧化碳混合比以及选定的非甲烷碳氢化合物混合比的分析。这些测量的结果将被纳入一个现有的数据库，用于限制全球CH4预算的大气模拟。这些测量还提供了CH4和其他微量气体半球间浓度梯度的详细信息，以及热带转换带（ITCZ）的大气混合信息。热带转换带是控制南北半球之间空气运动的缓冲带

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