Short-Lived Climate Forcers - MARAMA

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BC Report to Congress:October 2009 Interior Appropriations p Bill Requirement• “Not later than 18 months after the date of enactment of this Act, theAdministrator, i in consultation with other Federal agencies, shall carry outand submit to Congress the results of a study on domestic andinternational black carbon emissions that shall include– an inventory of the major sources of black carbon,– an assessment of the impacts of black carbon on global and regional climate,– an assessment of potential metrics and approaches for quantifying the climaticeffects of black carbon emissions (including its radiative forcing and warmingeffects) and comparing those effects to the effects of carbon dioxide and othergreenhouse gases,– an identification of the most cost-effective approaches to reduce black carbonemissions, and– an analysis of the climatic effects and other environmental and public healthbenefits of those approaches. ”U.S. Environmental Protection Agency – Office of Air and Radiation16
<strong>Climate</strong> Impacts of BC• BC is most strongly light-absorbingcomponent of direct PM 2.5– Product of incomplete combustion• Affects climate by:– Absorbing incoming and reflected sunlight– Darkening clouds, snow and ice, therebyreducing reflection of light back to space(albedo)– Altering precipitation and cloud patterns--reducing rainfall and increasing surfacedimmingi• Remains in atmosphere only days to weeks• Principally a regional pollutant (unlike CO 2 )U.S. Environmental Protection Agency – Office of Air and Radiation17
Page 1 and 2: Short-Lived Climate ForcersMid-Atla
Page 3 and 4: Comparison of Global Average Radiat
Page 5 and 6: Even aggressive CO 2 reductions, ma
Page 7 and 8: Recent SLCF Activities• Conventio
Page 9 and 10: Attaining More Stringent Ozone NAAQ
Page 11 and 12: CH 4 is an O 3 Precursor• Address
Page 13 and 14: U.S. Methane Activities• Voluntar
Page 15: BLACK CARBON:IMPACTS AND MITIGATION
Page 19 and 20: BC Impacts: GlaciersIn the Himalaya
Page 21 and 22: Global Sources of Black Carbon:(Lam
Page 23 and 24: Mitigation of Black Carbon• Locat
Page 25: Summary of Key Messages fromthis Pr

Short-Lived Climate Forcers - MARAMA

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