Reconciling reported and unreported HFC emissions with atmospheric observations

TitleReconciling reported and unreported HFC emissions with atmospheric observations
Publication TypeJournal Article
Year of Publication2015
AuthorsLunt M.F, Rigby M, Ganesan A.L, Manning A.J, Prinn RG, O'Doherty S, Mühle J, Harth CM, Salameh PK, Arnold T., Weiss RF, Saito T., Yokouchi Y., Krummel PB, Steele LP, Fraser PJ, Li S.L, Park S., Reimann S., Vollmer M.K, Lunder C., Hermansen O., Schmidbauer N., Maione M., Arduini J., Young D, Simmonds PG
JournalProceedings of the National Academy of Sciences of the United States of America
Date Published2015/05
Type of ArticleArticle
ISBN Number0027-8424
Accession NumberWOS:000354390600040
Keywordsclimate change; east-asia; gas emissions; global emissions; halocarbons; hcfc-22; in-situ; inversion; radiative forcing

We infer global and regional emissions of five of the most abundant hydrofluorocarbons (HFCs) using atmospheric measurements from the Advanced Global Atmospheric Gases Experiment and the National Institute for Environmental Studies, Japan, networks. We find that the total CO2-equivalent emissions of the five HFCs from countries that are required to provide detailed, annual reports to the United Nations Framework Convention on Climate Change (UNFCCC) increased from 198 (175-221) Tg-CO2-eq.y(-1) in 2007 to 275 (246-304) Tg-CO2-eq.y(-1) in 2012. These global warming potential-weighted aggregated emissions agree well with those reported to the UNFCCC throughout this period and indicate that the gap between reported emissions and global HFC emissions derived from atmospheric trends is almost entirely due to emissions from nonreporting countries. However, our measurement-based estimates of individual HFC species suggest that emissions, from reporting countries, of the most abundant HFC, HFC-134a, were only 79% (63-95%) of the UNFCCC inventory total, while other HFC emissions were significantly greater than the reported values. These results suggest that there are inaccuracies in the reporting methods for individual HFCs, which appear to cancel when aggregated together.

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