Improving the Understanding of Halocarbon Lifetimes and Emissions

这项研究使用建模工具来提高对大气中各种卤代烃的排放和寿命的理解，包括氯氟烃（CFC），氢氯氟烃（HCFC），氢氟碳化物（HFC）和全氟化化合物，如六氟化硫（SF-6）和环菊六糖（CF-6）。 包括氟氯化碳和氟氯烃在内的卤化碳的排放会导致全球气候变化和臭氧损失，而氢氟碳化合物和全氟气体的排放则会导致气候变化。 该项目的三个组成部分包括：（1）利用先前为氟氯化碳-11、-12和-13开发和应用的概率贝叶斯模型，改进对更多种类的卤化碳气体的库存、排放、寿命及其各自的不确定性的研究;（2）在最近关于海洋对氟氯化碳-11寿命的重大影响的建模工作的基础上，努力审查海洋的潜在影响及其随时间的变化对一系列卤化碳气体的寿命、排放和区域大气浓度的影响;（3）大气寿命、平流层-对流层交换、该奖项反映了NSF的法定使命，并已被认为是值得通过评估使用的支持，基金会的学术价值和更广泛的影响评审标准。

This research uses modeling tools to improve the understanding of the emissions and lifetimes in the atmosphere of a broad range of halocarbons, including chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), hydrofluorocarbons (HFCs), and fully fluorinated compounds such as sulfur hexafluoride (SF-6) and cycloinulohexaose (CF-6). Emissions of halocarbons, including CFCs and HCFCs, contribute to both global climate change and ozone loss, while those of the HFCs and perfluorinated gases contribute to climate change. The results of this research will be relevant to future international assessments of ozone, climate, and chemistry.The three components of this project include: (1) Improved studies of the banks, emissions, lifetimes, and their respective uncertainties for an expanded range of halocarbon gases, using a probabilistic Bayesian model developed and applied previously for CFC-11, -12 and -13; (2) Efforts to examine the potential influence of the ocean and its variability over time on lifetimes, emissions, and regional atmospheric concentrations for a range of halocarbon gases, building on recent modelling work of the significant effects of the ocean on the lifetime of CFC-11; and (3) Research on the interannual dynamical variations in the atmospheric lifetimes, stratospheric-tropospheric exchange, and tropospheric concentrations of halocarbons using a global atmospheric model.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.