High frequency measurements of HFCs at a remote site in east Asia and their implications for Chinese emissions

摘要: [1] High frequency monitoring of hydrofluorocarbons (HFCs) and some other halocarbons in the atmosphere has been performed at Hateruma Island (lat. 24.1°N, long. 123.8°E), a background site east Asia. The observed concentrations showed occasional short-term enhancement events over hours to days as well clear seasonal variation, being lower summer than seasons. We found that HFC-23 enhancements were closely related air transport from China. Using tagged simulation three-dimensional model tracer-ratio technique, emission rate China was estimated amount 10 Gg (= 000 metric tonnes) per year with an uncertainty 50%, which could account for two thirds total global emission. HFCs emitted Japan, Korea, Taiwan characterized by predominance HFC-134a very little contribution HFC-23.