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dc.contributor.authorMiller, Benjamin R.
dc.contributor.authorRigby, Matthew
dc.contributor.authorKuijpers, L. J. M.
dc.contributor.authorKrummel, P. B.
dc.contributor.authorSteele, L. P.
dc.contributor.authorLeist, Michael
dc.contributor.authorFraser, P. J.
dc.contributor.authorMcCulloch, A.
dc.contributor.authorHarth, C. M.
dc.contributor.authorSalameh, P.
dc.contributor.authorMuhle, Jens
dc.contributor.authorWeiss, R. F.
dc.contributor.authorWang, R. H. J.
dc.contributor.authorO'Doherty, Simon
dc.contributor.authorGreally, B. R.
dc.contributor.authorSimmonds, P. G.
dc.contributor.authorPrinn, Ronald G
dc.date.accessioned2011-07-08T17:16:25Z
dc.date.available2011-07-08T17:16:25Z
dc.date.issued2010-08
dc.date.submitted2010-07
dc.identifier.issn1680-7316
dc.identifier.issn1680-7324
dc.identifier.urihttp://hdl.handle.net/1721.1/64775
dc.description.abstractHFC-23 (also known as CHF3 [CHF subscript 3], fluoroform or trifluoromethane) is a potent greenhouse gas (GHG), with a global warming potential (GWP) of 14 800 for a 100-year time horizon. It is an unavoidable by-product of HCFC-22 (CHClF2 [CHCIF subscript 2], chlorodifluoromethane) production. HCFC-22, an ozone depleting substance (ODS), is used extensively in commercial refrigeration and air conditioning, in the extruded polystyrene (XPS) foam industries (dispersive applications) and also as a feedstock in fluoropolymer manufacture (a non-dispersive use). Aside from small markets in specialty uses, HFC-23 has historically been considered a waste gas that was, and often still is, simply vented to the atmosphere. Efforts have been made in the past two decades to reduce HFC-23 emissions, including destruction (incineration) in facilities in developing countries under the United Nations Framework Convention on Climate Change's (UNFCCC) Clean Development Mechanism (CDM), and by process optimization and/or voluntary incineration by most producers in developed countries. We present observations of lower-tropospheric mole fractions of HFC-23 measured by "Medusa" GC/MSD instruments from ambient air sampled in situ at the Advanced Global Atmospheric Gases Experiment (AGAGE) network of five remote sites (2007–2009) and in Cape Grim air archive (CGAA) samples (1978–2009) from Tasmania, Australia. These observations are used with the AGAGE 2-D atmospheric 12-box model and an inverse method to produce model mole fractions and a "top-down" HFC-23 emission history. The model 2009 annual mean global lower-tropospheric background abundance is 22.6 (±0.2) pmol mol−1 [mol superscript -1]. The derived HFC-23 emissions show a "plateau" during 1997–2003, followed by a rapid ~50% increase to a peak of 15.0 (+1.3/−1.2) Gg/yr in 2006. Following this peak, emissions of HFC-23 declined rapidly to 8.6 (+0.9/−1.0) Gg/yr in 2009, the lowest annual emission of the past 15 years. We derive a 1990–2008 "bottom-up" HFC-23 emission history using data from the United Nations Environment Programme and the UNFCCC. Comparison with the top-down HFC-23 emission history shows agreement within the stated uncertainties. In the 1990s, HFC-23 emissions from developed countries dominated all other sources, then began to decline and eventually became fairly constant during 2003–2008. By this point, with developed countries' emissions essentially at a plateau, the major factor controlling the annual dynamics of global HFC-23 emissions became the historical rise of developing countries' HCFC-22 dispersive use production, which peaked in 2007. Thereafter in 2007–2009, incineration through CDM projects became a larger factor, reducing global HFC-23 emissions despite rapidly rising HCFC-22 feedstock production in developing countries.en_US
dc.description.sponsorshipNASA Upper Atmospheric Research Program (Grant NNX07AE89G)en_US
dc.description.sponsorshipNASA Upper Atmospheric Research Program (Grant NNX07AF09G)en_US
dc.description.sponsorshipNASA Upper Atmospheric Research Program (Grant NNX07AE87G)en_US
dc.language.isoen_US
dc.publisherEuropean Geosciences Unionen_US
dc.relation.isversionofhttp://dx.doi.org/10.5194/acp-10-7875-2010en_US
dc.rightsCreative Commons Attribution 3.0en_US
dc.rights.urihttp://creativecommons.org/licenses/by/3.0en_US
dc.sourceCopernicusen_US
dc.titleHFC-23 (CHF3) emission trend response to HCFC-22 (CHClF2) production and recent HFC-23 emission abatement measuresen_US
dc.typeArticleen_US
dc.identifier.citationMiller, B. R., Rigby, M., Kuijpers, L. J. M., Krummel, P. B., Steele, L. P., Leist, M., Fraser, P. J., McCulloch, A., Harth, C., Salameh, P., Mühle, J., Weiss, R. F., Prinn, R. G., Wang, R. H. J., O'Doherty, S., Greally, B. R., and Simmonds, P. G.: HFC-23 (CHF3) emission trend response to HCFC-22 (CHClF2) production and recent HFC-23 emission abatement measures, Atmos. Chem. Phys., 10, 7875-7890 © Author(s) 2010en_US
dc.contributor.departmentMassachusetts Institute of Technology. Center for Global Change Scienceen_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciencesen_US
dc.contributor.approverPrinn, Ronald G.
dc.contributor.mitauthorRigby, Matthew
dc.contributor.mitauthorPrinn, Ronald G.
dc.relation.journalAtmospheric Chemistry and Physicsen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.orderedauthorsMiller, B. R.; Rigby, M.; Kuijpers, L. J. M.; Krummel, P. B.; Steele, L. P.; Leist, M.; Fraser, P. J.; McCulloch, A.; Harth, C.; Salameh, P.; Mühle, J.; Weiss, R. F.; Prinn, R. G.; Wang, R. H. J.; O'Doherty, S.; Greally, B. R.; Simmonds, P. G.en
dc.identifier.orcidhttps://orcid.org/0000-0001-5925-3801
mit.licensePUBLISHER_CCen_US
mit.metadata.statusComplete


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