Abatement of greenhouse gases : Does location matter?

摘要: Today's climate policy is based on the assumption that location of emissions reductions has no impact overall effect. However, this may not be case since greenhouse gases generally will lead to changes in short-lived and aerosols. Abatement measures primarily targeted at reducing CO2, but also simultaneously reduce NOx, CO, CH4 SO2 Emissions these species cause significant additional radiative forcing. We have used a global 3-D chemical transport model transfer study terms forcing for realistic change from large-scale sources. Based an assumed 10% reduction CO2 emissions, other been estimated. Climate SRES A1B scenario compared two cases, with main focus emission between 2010 2030, sustained reductions. The are applied four different regions (Europe, China, South Asia, America). In integrated (over 100 yr), total effect (including only direct aerosols) always smaller than alone. Large variations found (53–86% effect). Inclusion indirect effects sulphate aerosols reduces net towards zero. temperature responses, calculated simple energy balance model, show initial warming magnitude followed by more uniform later. A major part regional differences can attributed related aerosols, while ozone methane lifetime make relatively small contributions. Emission sector (e.g. transportation instead sources) might conclusion NOx ratio significantly higher abatement thus depends (i) which affected measure, (ii) measure implemented, (iii) time horizon over considered, (iv) chemical, physical meteorological conditions region. There important implications results. Equal cannot if implemented region several affected. Thus, design should considered thoroughly before implementation.