Abstract：
The enforcement of a global hydrofluorocarbon (HFC) refrigerant phase down led to the introduction of hydrofluoroolefins (HFOs) as a low Global Warming Potential (GWP) substitute, given their low atmospheric lifetime. However, to this date it is not fully clear the long-term atmospheric fate of HFOs primary degradation products: trifluoro acetaldehyde (TFE), trifluoro acetyl fluoride (TFF), and trifluoroacetic acid (TFA). It particularly concerns the possibility of forming HFC-23, a potent global warming agent. Although the atmospheric reaction networks of TFE, TFF, and TFA have a fair level of complexity, the relevant atmospheric chemical pathways are well characterized in the literature, enabling a comprehensive hazard assessment of HFC-23 formation as a secondary HFO breakdown product in diverse scenarios. A lower bound of the HFOs effective GWP in a baseline scenario is found above regulatory thresholds. While further research is crucial to refine climate risk assessments, the existing evidence suggests a non-negligible climate hazard associated with HFOs.
摘要：
全球氢氟碳化合物（HFC）制冷剂相下降的实施导致氢氟烯烃（HFO）作为低全球变暖潜能值（GWP）替代品的引入，考虑到他们的低大气寿命。然而,迄今为止，尚不完全清楚HFOs主要降解产物三氟乙醛（TFE）的长期大气命运，三氟乙酰氟（TFF），和三氟乙酸(TFA)。它特别涉及形成HFC-23的可能性,HFC-23是一种有效的全球变暖剂。虽然TFE的大气反应网络，TFF,TFA有相当的复杂性，相关的大气化学途径在文献中有很好的特点，能够对HFC-23的形成进行全面的危害评估，作为不同情况下的次要HFO分解产品。在基线情况下，HFO有效GWP的下限高于监管阈值。虽然进一步的研究对于完善气候风险评估至关重要，现有证据表明，与HFOs相关的气候危害不可忽视。
