Climate impacts of emissions from the transport sectors

The transport sector is responsible for a large and growing share of global emissions affecting climate, including significant emissions of ozone precursors. The impact of all of emissions from different transport modes on ozone, methane lifetime and the long-term “primary mode” ozone effect has been calculated with the Oslo CTM2 model. Due to very different mixtures of precursors (NOx, CO and VOCs) and differences in chemical background conditions where the emission takes place, we find that the impact is significantly different between the transport modes. We provide a comprehensive analysis of radiative forcing from the road transport, shipping, aviation, and rail subsectors, using both past- and forward-looking perspectives. We find that, since preindustrial times, transport has contributed 31% of the total man made O3 forcing, respectively. A forward looking perspective shows that the current emissions from transport are responsible for 16% of the integrated net forcing over 100 years from all current man-made emissions. The dominating contributor to positive forcing (warming) is CO2, followed by tropospheric O3. By subsector, road transport is the largest contributor to warming. The transport sector also exerts cooling through reduced methane lifetime and atmospheric aerosol effects. Shipping causes net cooling, except on future time scales of several centuries.


Berntsen, Terje, Jan S. Fuglestvedt, Gunnar Myhre, Kristin Rypdal and Ragnhild Bieltvedt Skeie, 2008. Climate impacts of emissions from the transport sectors. Quadrennial Ozone Symposium, Tromsø, Juli 08,

Flere detaljer

  • Språk: Engelsk
  • Kategori: Konferanseforedrag/postere
  • Tittel: Climate impacts of emissions from the transport sectors
  • Konferanse tittel/dato: Quadrennial Ozone Symposium, Tromsø, Juli 08

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