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SROC Chapter 2 2 Chemical and Radiative Effects of Halocarbons and Their Replacement Compounds Coordinating Lead Authors Guus J.M. Velders (The Netherlands), Sasha Madronich (USA) Lead Authors Cathy Clerbaux (France), Richard Derwent (UK), Michel Grutter (Mexico), Didier Hauglustaine (France), Selahattin Incecik (Turkey), Malcolm Ko (USA), Jean-Marie Libre (France), Ole John Nielsen (Denmark), Frode Stordal (Norway), Tong Zhu (China) Contributing Authors Donald Blake (USA), Derek Cunnold (USA), John Daniel (USA), Piers Forster (UK), Paul Fraser (Australia), Paul Krummel (Australia), Alistair Manning (UK), Steve Montzka (USA), Gunnar Myhre (Norway), Simon O’Doherty (UK), David Oram (UK), Michael Prather (USA), Ronald Prinn (USA), Stefan Reimann (Switzerland), Peter Simmonds (UK), Tim Wallington (USA), Ray Weiss (USA) Review Editors Ivar S.A. Isaksen (Norway), Bubu P. Jallow (Gambia) IPCC Boek (dik).indb 133 15-08-2005 10:53:32 134 IPCC/TEAP Special Report: Safeguarding the Ozone Layer and the Global Climate System Contents EXECUTIVE SUMMARY 135 2.5 Radiative properties and global warming potentials 156 2.1 Introduction 137 2.5.1 Calculation of GWPs 156 2.5.2 Calculation of radiative forcing 157 2.2 Atmospheric lifetimes and removal processes 137 2.5.3 Other aspects affecting GWP 2.2.1 Calculation of atmospheric lifetimes of calculations 158 halocarbons and replacement compounds 137 2.5.4 Reported values 159 2.2.2 Oxidation by OH in the troposphere 140 2.5.5 Future radiative forcing 163 2.2.3 Removal processes in the stratosphere 142 2.2.4 Other sinks 142 2.6 Impacts on air quality 166 2.2.5 Halogenated trace gas steady-state 2.6.1 Scope of impacts 166 lifetimes 143 2.6.2 Global-scale air quality impacts 167 2.6.3 Urban and regional air quality 169 2.3 Concentrations of CFCs, HCFCs, HFCs and PFCs 143 References 173 2.3.1 Measurements of surface concentrations and growth rates 143 2.3.2 Deriving global emissions from observed concentrations and trends 147 2.3.3 Deriving regional emissions from observed concentrations 149 2.4 Decomposition and degradation products from HCFCs, HFCs, HFEs, PFCs and NH3 151 2.4.1 Degradation products from HCFCs, HFCs and HFEs 151 2.4.2 Trifluoroacetic acid (TFA, CF3C(O)OH)) 154 2.4.3 Other halogenated acids in the environment 155 2.4.4 Ammonia (NH3) 155 IPCC Boek (dik).indb 134 15-08-2005 10:53:33 Chapter 2: Chemical and Radiative Effects of Halocarbons and Their Replacement Compounds 135 EXECUTIVE SUMMARY and nitrogen oxides, and as a result of climate change and changes in tropospheric ultraviolet radiation. The sign and • Human-made halocarbons, including chlorofluorocarbons magnitude of the future change in OH concentrations are (CFCs), perfluorocarbons (PFCs), hydrofluorocarbons uncertain, and range from –18 to +5% for the year 2100, (HFCs) and hydrochlorofluorocarbons (HCFCs), are depending on the emission scenario. For the same emissions effective absorbers of infrared radiation, so that even of halocarbons, a decrease in future OH would lead to small amounts of these gases contribute to the radiative higher concentrations of these halocarbons and hence would forcing of the climate system. Some of these gases and increase their radiative forcing, whereas an increase in their replacements also contribute to stratospheric ozone future OH would lead to lower concentrations and smaller depletion and to the deterioration of local air quality. radiative forcing. • The ODSs have contributed 0.32 W m–2 (13%) to the direct Concentrations and radiative forcing of fluorinated gases and radiative forcing of all well-mixed greenhouse gases, relative replacement chemicals to pre-industrial times. This contribution is dominated by • HCFCs of industrial importance have lifetimes in the range CFCs. The current (2003) contributions of HFCs and PFCs 1.3–20 years. Their global-mean tropospheric concentrations to the total radiative forcing by long-lived greenhouse gases in 2003, expressed as molar mixing ratios (parts per trillion, are 0.0083 W m–2 (0.31%) and 0.0038 W m–2 (0.15%), ppt, 10–12), were 157 ppt for HCFC-22, 16 ppt for HCFC- respectively. 141b, and 14 ppt for HCFC-142b. • Based on the emissions reported in Chapter 11 of this • HFCs of industrial importance have lifetimes in the report, the estimated radiative forcing of HFCs in 2015 range 1.4–270 years. In 2003 their observed atmospheric is in the range of 0.019–0.030 W m–2 compared with the concentrations were 17.5 ppt for HFC-23, 2.7 ppt for HFC- range 0.022–0.025 W m–2 based on projections in the IPCC 125, 26 ppt for HFC-134a, and 2.6 ppt for HFC-152a. Special Report on Emission Scenarios (SRES). Based on • The observed atmospheric concentrations of these HCFCs SRES projections, the radiative forcing of HFCs and PFCs and HFCs can be explained by anthropogenic emissions, corresponds to about 6–10% and 2%, respectively, of the within the range of uncertainties in calibration and emission total estimated radiative forcing due to CFCs and HCFCs in estimates. 2015. • PFCs and SF6 have lifetimes in the range 1000–50,000 years • Projections of emissions over longer time scales become more and make an essentially permanent contribution to radiative uncertain because of the growing influence of uncertainties forcing. Concentrations in 2003 were 76 ppt for CF4, 2.9 in technological practices and policies. However, based on ppt for C2F6, and 5 ppt for SF6. Both anthropogenic and the range of SRES emission scenarios, the contribution of natural sources of CF4 are needed to explain its observed HFCs to radiative forcing in 2100 could range from 0.1 atmospheric abundance. to 0.25 W m–2 and of from PFCs 0.02 to 0.04 W m–2. In • Global and regional emissions of CFCs, HCFCs and HFCs comparison, the forcing from carbon dioxide (CO2) in these have been derived from observed concentrations and can scenarios ranges from about 4.0 to 6.7 W m–2 in 2100. be used to check emission inventory estimates. Global • Actions taken under the Montreal Protocol and its emissions of HCFC-22 have risen steadily over the period Adjustments and Amendments have led to the replacement 1975–2000, whereas those of HCFC-141b, HCFC-142b and of CFCs with HCFCs, HFCs, and other substances, and HFC-134a started to increase quickly in the early 1990s. In to changing of industrial processes. These actions have Europe, sharp increases in emissions occurred for HFC- begun to reduce atmospheric chlorine loading. Because 134a over 1995–1998 and for HFC-152a over 1996–2000, replacement species generally have lower global warming with some levelling off of both through 2003. potentials (GWPs), and because total halocarbon emissions • Volatile organic compounds (VOCs) and ammonia (NH3), have decreased, the total CO2-equivalent emission (direct which are considered as replacement species for refrigerants GWP-weighted using a 100-year time horizon) of all or foam blowing agents, have lifetimes of several months or halocarbons has also been reduced. The combined CO2- less, hence their distributions are spatially and temporally equivalent emissions of CFCs, HCFCs and HFCs decreased –1 variable. It is therefore difficult to quantify their climate from a peak of about 7.5 ± 0.4 GtCO2-eq yr around 1990 –1 impacts with single globally averaged numbers. The direct to about 2.5 ± 0.2 GtCO2-eq yr in the year 2000, which and indirect radiative forcings associated with their use as corresponds to about 10% of that year’s CO2 emissions from substitutes are very likely to have a negligible effect on global fossil-fuel burning. global climate because of their small contribution to existing VOC and NH3 abundances in the atmosphere. Banks • The lifetimes of many halocarbons depend on the • Continuing observations of CFCs and other ODSs in the concentration of the hydroxyl radical (OH), which might atmosphere enable improved validation of estimates of the change in the 21st century as a result of changes in emissions lag between production and emission to the atmosphere, of carbon monoxide, natural and anthropogenic VOCs, and of the associated banks of these gases. Because new IPCC Boek (dik).indb 135 15-08-2005 10:53:33 136 IPCC/TEAP Special Report: Safeguarding the Ozone Layer and the Global Climate System production of ODSs has been greatly reduced, annual Degradation products changes in their concentrations are increasingly dominated • The intermediate degradation products of most long- by releases from existing banks. The decrease in the lived CFCs, HCFCs and HFCs have shorter lifetimes than atmospheric concentrations of several gases is placing the source gases, and therefore have lower atmospheric tighter constraints on their derived emissions and banks. concentrations and smaller radiative forcing. Intermediate This information provides new insights into the significance products and final products are removed from the atmosphere of banks and end-of-life options for applications using via deposition and washout processes and may accumulate HCFCs and HFCs as well. in oceans, lakes and other reservoirs. • Current banked halocarbons will make a substantial • Trifluoroacetic acid (TFA) is a persistent degradation contribution to future radiative forcing of climate for product of some HFCs and HCFCs, with yields that are many decades unless a large proportion of these banks known from laboratory studies. TFA is removed from the is destroyed. Large portions of the global inventories of atmosphere mainly by wet deposition. TFA is toxic to CFCs, HCFCs and HFCs currently reside in banks. For some aquatic life forms at concentrations at concentrations example, it is estimated that about 50% of the total global approaching 1 mg L–1. Current observations show that the inventory of HFC-134a currently resides in the atmosphere typical concentration of TFA in the oceans is 0.2 µg L–1, but and 50% resides in banks.
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