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Open Access Publications from the University of California

Increase in HFC-134a emissions in response to the success of the Montreal Protocol

  • Author(s): Fortems-Cheiney, A
  • Saunois, M
  • Pison, I
  • Chevallier, F
  • Bousquet, P
  • Cressot, C
  • Montzka, SA
  • Fraser, PJ
  • Vollmer, MK
  • Simmonds, PG
  • Young, D
  • O'Doherty, S
  • Weiss, RF
  • Artuso, F
  • Barletta, B
  • Blake, DR
  • Li, S
  • Lunder, C
  • Miller, BR
  • Park, S
  • Prinn, R
  • Saito, T
  • Steele, LP
  • Yokouchi, Y
  • et al.

©2015. American Geophysical Union. The 1,1,1,2-tetrafluoroethane (HFC-134a), an important alternative to CFC-12 in accordance with the Montreal Protocol on Substances that Deplete the Ozone Layer, is a high global warming potential greenhouse gas. Here we evaluate variations in global and regional HFC-134a emissions and emission trends, from 1995 to 2010, at a relatively high spatial and temporal (3.75° in longitude×2.5° in latitude and 8day) resolution, using surface HFC-134a measurements. Our results show a progressive increase of global HFC-134a emissions from 19±2Gg/yr in 1995 to 167±5Gg/yr in 2010, with both a slowdown in developed countries and a 20%/yr increase in China since 2005. A seasonal cycle is also seen since 2002, which becomes enhanced over time, with larger values during the boreal summer.

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