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

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

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3321814y&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 21, CiteID L21814

Other

14

Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Atmospheric Composition And Structure: Troposphere: Constituent Transport And Chemistry, Atmospheric Composition And Structure: Instruments And Techniques, Global Change: Atmosphere (0315, 0325)

Scientific paper

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 in east Asia. The observed concentrations showed occasional short-term enhancement events over hours to days as well as a clear seasonal variation, being lower in summer than in other seasons. We found that HFC-23 enhancements were closely related to the air transport from China. Using a tagged simulation from three-dimensional transport model and a tracer-ratio technique, the emission rate of HFC-23 from China was estimated to amount to 10 Gg (= 10 000 metric tonnes) per year with an uncertainty of 50%, which could account for two thirds of the total global emission. HFCs emitted from Japan, Korea, and Taiwan were characterized by a predominance of HFC-134a with very little contribution of HFC-23.

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