Dissecting Future Aerosol Emissions: warming Tendencies and Mitigation Opportunities

Future global emissions of aerosols will play an important role in governing the nature and magnitude of future anthropogenic climate change. We present in this paper a number of future scenarios of emissions of black carbon (BC) and organic carbon (OC) by world region, which we combine with sulfate (SO4) assessed in terms of the emissions of its precursor, SO2. We find that aerosol emissions from the household and industrial sectors are likely to decline along almost all future pathways. Transportation emissions, however, are subject to complex interacting forces that can lead to either increases or decreases. Biomass burning declines in many scenarios, but the Amazon rainforests remain vulnerable if unsustainable economic growth persists. East Asia is the key region for primary aerosols, and trends in China will have a major bearing on the direction and magnitude of releases of BC (expected reductions in the range of 640–1290 Gg), OC (reductions of 520–1900 Gg), and SO2 (ranging from an increase of 21 Tg to a reduction of 30 Tg). Analysis of joint BC, OC, and SO2 emission changes identifies a number of key world regions and economic sectors that could be effectively targeted for aerosol reductions.

[1]  J. Hansen,et al.  Global warming in the twenty-first century: an alternative scenario. , 2000, Proceedings of the National Academy of Sciences of the United States of America.

[2]  Meinrat O. Andreae,et al.  The dark side of aerosols , 2001, Nature.

[3]  Jost Heintzenberg,et al.  Sulfate Cooling Effect on Climate Through In-Cloud Oxidation of Anthropogenic SO2 , 1992, Science.

[4]  Alexei G. Sankovski,et al.  Special report on emissions scenarios : a special report of Working group III of the Intergovernmental Panel on Climate Change , 2000 .

[5]  M. Jacobson.  Control of fossil‐fuel particulate black carbon and organic matter, possibly the most effective method of slowing global warming , 2002 .

[6]  J. Hansen,et al.  Climate Effects of Black Carbon Aerosols in China and India , 2002, Science.

[7]  H. Hansson,et al.  Organic atmospheric aerosols: Review and state of the science , 2000 .

[8]  C. Brooks.  Climatic Change , 1913, Nature.

[9]  John H. Seinfeld,et al.  Climate response of direct radiative forcing of anthropogenic black carbon , 2005 .

[10]  Michael Q. Wang,et al.  Black carbon emissions in China , 2001 .

[11]  J. Seinfeld,et al.  Global distribution and climate forcing of carbonaceous aerosols , 2002 .

[12]  J. Kiehl,et al.  The Relative Roles of Sulfate Aerosols and Greenhouse Gases in Climate Forcing , 1993, Science.

[13]  M. Jacobson.  A physically‐based treatment of elemental carbon optics: Implications for global direct forcing of aerosols , 2000 .

[14]  J. Hansen,et al.  Trends of measured climate forcing agents , 2001, Proceedings of the National Academy of Sciences of the United States of America.

[15]  M. Jacobson,et al.  Strong radiative heating due to the mixing state of black carbon in atmospheric aerosols , 2022 .

[16]  D. Streets,et al.  A technology‐based global inventory of black and organic carbon emissions from combustion , 2004 .

[17]  G. Carmichael,et al.  Biomass burning in Asia: Annual and seasonal estimates and atmospheric emissions , 2003 .

[18]  Tami C. Bond,et al.  On the future of carbonaceous aerosol emissions , 2004 .

[19]  J. Hansen,et al.  Efficacy of climate forcings , 2005 .

[20]  Mnv,et al.  The IMAGE 2.2 implementation of the SRES scenarios; A comprehensive analysis of emissions, climate change and impacts in the 21st century , 2001 .

[21]  M. Gilles,et al.  Organic Aerosol Growth Mechanisms and Their Climate-Forcing Implications , 2004, Science.

[22]  M. Andreae,et al.  Formation of Secondary Organic Aerosols Through Photooxidation of Isoprene , 2004, Science.

[23]  Joyce E. Penner,et al.  Soot and smoke aerosol may not warm climate , 2002 .

[24]  J. Coakley,et al.  Climate Forcing by Anthropogenic Aerosols , 1992, Science.

[25]  J. Wilson,et al.  A global black carbon aerosol model , 1996 .

[26]  V. Ramanathan,et al.  Aerosols, Climate, and the Hydrological Cycle , 2001, Science.

[27]  D. Streets,et al.  The importance of China's household sector for black carbon emissions , 2005 .

[28]  M. Andreae,et al.  Emission of trace gases and aerosols from biomass burning , 2001 .

[29]  Michael Q. Wang,et al.  An inventory of gaseous and primary aerosol emissions in Asia in the year 2000 , 2003 .

[30]  M. Bergin,et al.  Soot Takes Center Stage , 2002, Science.

[31]  J. Lelieveld,et al.  The Indian Ocean Experiment: Widespread Air Pollution from South and Southeast Asia , 2001, Science.

[32]  C. Liousse,et al.  Construction of a 1° × 1° fossil fuel emission data set for carbonaceous aerosol and implementation and radiative impact in the ECHAM4 model , 1999 .

[33]  A. Grübler.  A Review of Global and Regional Sulfur Emission Scenarios , 1998 .

[34]  Glenn E. Shaw,et al.  Indian Ocean Experiment: An integrated analysis of the climate forcing and effects of the great Indo-Asian haze , 2001 .

[35]  J. Houghton,et al.  Climate change 2001 : the scientific basis , 2001 .

[36]  U. Baltensperger,et al.  Identification of Polymers as Major Components of Atmospheric Organic Aerosols , 2004, Science.

[37]  V. Ramanathan,et al.  Reduction of tropical cloudiness by soot , 2000, Science.

[38]  T. Wigley,et al.  Could reducing fossil-fuel emissions cause global warming? , 1991, Nature.