Abstract
Abstract. Hydrochlorofluorocarbons (HCFCs) are ozone depleting substances and potent
greenhouse gases that are controlled under the Montreal Protocol. However,
the majority of the 274 HCFCs included in Annex C of the protocol do not have
reported global warming potentials (GWPs) which are used to guide the
phaseout of HCFCs and the future phase down of hydrofluorocarbons (HFCs). In
this study, GWPs for all C1–C3 HCFCs included in Annex C are
reported based on estimated atmospheric lifetimes and theoretical methods
used to calculate infrared absorption spectra. Atmospheric lifetimes were
estimated from a structure activity relationship (SAR) for OH radical
reactivity and estimated O(1D) reactivity and UV photolysis loss
processes. The C1–C3 HCFCs display a wide range of lifetimes (0.3
to 62 years) and GWPs (5 to 5330, 100-year time horizon) dependent on their
molecular structure and the H-atom content of the individual HCFC. The results
from this study provide estimated policy-relevant GWP metrics for the HCFCs
included in the Montreal Protocol in the absence of experimentally derived
metrics.
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33 articles.
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