Evidence for under-reported western European emissions of the potent greenhouse gas HFC-23

Details Evidence for under-reported western European emissions of the potent greenhouse gas HFC-23 Evidence for under-reported western European emissions of the potent greenhouse gas HFC-23

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3815808k&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 15, CiteID L15808

Physics

1

Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Atmospheric Processes: Regional Modeling (4316), Policy Sciences: Decision Making Under Uncertainty (1918, 4324, 4339), Public Issues: Legislation And Regulations (6324)

Scientific paper

Western European emission inventories of the potent greenhouse gas trifluoromethane (HFC-23) are validated at a country level by combining 2-hourly atmospheric in-situ measurements at Jungfraujoch (Switzerland) and Mace Head (Ireland) with Lagrangian transport simulations. HFC-23 has an atmospheric lifetime of ˜270 yr and a 100-yr global warming potential (GWP) of 14,800 and is unintentionally produced during the manufacture of chlorodifluoromethane (HCFC-22). For the study region we derive emissions of 144-216 Mg/yr for July 2008-July 2010, which are 60-140% higher than the official emissions gathered from the national reports for the year 2009. The largest discrepancy is found for Italy, where our estimate of 26-56 Mg/yr exceeds the national inventory (2.6 Mg/yr) by more than an order of magnitude. These findings suggest that non-reported emissions from Annex 1 countries partly explain the recently derived gap between global bottom-up and top-down HFC-23 emission estimates. The results presented here provide independent information to relevant authorities on effective reporting of HFC-23 emissions, and demonstrate the potential of atmospheric measurements for real-world verification of greenhouse gas emissions.

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