Journal Article

Reconciling reported and unreported HFC emissions with atmospheric observations

Hermansen, Ove, Prinn, Ronald G., Rigby, Matthew, Park, Sunyoung, Krummel, Paul B., Saito, Takuya, Weiss, Ray F., Steele, L. Paul, Li, Shanlan, Fraser, Paul J., Simmonds, Peter G., Ganesan, Anita L., Manning, Alistair J., Harth, Christina M., Vollmer, Martin K., Lunder, Chris, Salameh, Peter K., Arnold, Tim, Lunt, Mark F., O’Doherty, Simon, Yokouchi, Yoko, Maione, Michela, Young, Dickon, Arduini, Jgor, Mühle, Jens, Schmidbauer, Norbert, Reimann, Stefan

2015

Overview

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.

• Publisher: National Academy of Sciences
• Subject: Atmospheric gases / Carbon dioxide / Climate change / developed countries / Earth, Atmospheric, and Planetary Sciences / Emission measurements / Emissions / Environmental studies / Global warming / Greenhouse gases / Hydrofluorocarbons / inventories / Measurement / Perfluorocarbons / Physical Sciences / uncertainty