• An efficient and accurate carbon cycle model for use in simple climate models 

      Alfsen, Knut H.; Berntsen, Terje (CICERO Working Paper;1999:01, Working paper, 1999)
      The aim of this publication is to document a simple model of the atmospheric CO2 concentration based on exogenous input of anthropogenic emission of CO2 and taking air-sea exchange and biospheric responses into account. ...
    • A simple model for scenario studies of changes in global climate: Version 1.0 

      Fuglestvedt, Jan S.; Berntsen, Terje (CICERO Working Paper;1999:02, Working paper, 1999)
      This paper gives a documentation of a simple climate model for studying the effects of future climate gas emissions on global mean temperature and sea level. Input to the model is global emissions of 29 gases. Atmospheric ...
    • Assessing compliance with the Kyoto Protocol: Expert reviews, inverse modelling, or both? 

      Rypdal, Kristin; Stordal, Frode; Fuglestvedt, Jan S.; Berntsen, Terje (CICERO Working Paper;2003:07, Working paper, 2003)
      The Kyoto Protocol has an ambitious reporting and review system to assess nations’ compliance with their emission commitments. This system requires considerable resources to assure that the Parties report accurate emission ...
    • Assessing metrics of climate change: Current methods and future possibilities 

      Fuglestvedt, Jan S.; Berntsen, Terje; Godal, Odd; Sausen, Robert; Shine, Keith P.; Skodvin, Tora (CICERO Report;2001:04, Research report, 2001)
      With the principle of comprehensiveness embedded in the UN Framework Convention on Climate Change (Art. 3), a multi-gas abatement strategy with emphasis also on non-CO2 greenhouse gases as targets for reduction and control ...
    • Climate strategy for Africa 

      Hernes, Helga; Dalfelt, Arne; Berntsen, Terje; Holtsmark, Bjart; Næss, Lars Otto; Selrod, Rolf; Aaheim, H. Asbjørn (CICERO Report;1995:03, Research report, 1995)
      1. General observations Africa south of the Sahara is probably the most vulnerable region when it comes to the impact and consequences of climate changes. Yet the African continent runs a serious risk of being marginalized ...
    • Climatic effects of NOx emissions through changes in tropospheric O3 and CH4: A global 3D model study 

      Fuglestvedt, Jan S.; Berntsen, Terje; Isaksen, Ivar S. A.; Mao, Huiting; Liang, Xin-Zhong; Wang, Wei-Chyung (CICERO Report;1997:03, Research report, 1997)
      As a result of chemical processes in the atmosphere, emissions of NOx can both damp and enhance the greenhouse effect. The two most important effects of NOx in this context are increased concentrations of tropospheric ozone ...
    • Effects of anthropogenic emissions on tropospheric ozone and its radiative forcing 

      Berntsen, Terje; Isaksen, Ivar S. A.; Fuglestvedt, Jan S.; Myhre, Gunnar; Larsen, T. Alsvik; Stordal, Frode; Freckleton, R. S.; Shine, Keith P. (CICERO Report;1997:02, Research report, 1997)
      Tropospheric ozone changes since pre-industrial times due to changes in emissions have been calculated by the University of Oslo global 3-D photochemical model. The radiative forcing caused by the increase in ozone has ...
    • Estimates of future climate based on SRES emission scenarios 

      Godal, Odd; Sygna, Linda; Fuglestvedt, Jan S.; Berntsen, Terje (CICERO Working Paper;2000:04, Working paper, 2000)
      The preliminary emission scenarios in the Special Report on Emission Scenario (SRES) developed by the Intergovernmental Panel on Climate Change (IPCC), will eventually replace the old IS92 scenarios. By running these ...
    • Exploring distribution of commitments: A follow-up to the Berlin Mandate 

      Torvanger, Asbjørn; Berntsen, Terje; Fuglestvedt, Jan S.; Holtsmark, Bjart; Ringius, Lasse; Aaheim, H. Asbjørn (CICERO Report;1996:03, Research report, 1996)
      The study reviews and analyzes some major issues that must be considered when defining principles for distributing commitments to reduce greenhouse gas emissions for countries belonging to the Organization for Economic ...
    • Impacts of reduced NOx emissions on radiative forcing through changes in tropospheric O3 and CH4: A global 3-D model study 

      Fuglestvedt, Jan S.; Berntsen, Terje; Isaksen, Ivar S. A.; Mao, Huiting; Liang, Xin-Zhong; Wang, Wei-Chyung (CICERO Working Paper;1997:01, Working paper, 1997)
      A three-dimensional global chemical tracer model and a radiation transfer model have been used to study the role of reduced NOx emissions on radiative forcing. Through production of tropospheric O3, NOx emissions lead to ...
    • Luftfart og klima - En oppdatert oversikt over status for forskning på klimaeffekter av utslipp fra fly 

      Lund, Marianne Tronstad; Aamaas, Borgar; Berntsen, Terje; Fuglestvedt, Jan S. (CICERO Report;2016:05, Research report, 2016)
      Denne rapporten gir en oppdatert oversikt over hvordan og i hvilken grad de ulike utslippene fra flytrafikk påvirker klima basert på den nyeste forskningen. For å forstå den totale klimaeffekten av luftfart er det viktig ...
    • NOx emissions from aircraft: Effects of lightning and convection on changes in tropospheric ozone 

      Berntsen, Terje; Isaksen, Ivar S. A. (CICERO Working Paper;1998:05, Working paper, 1998)
      A global 3-dimensional chemical tracer model (CTM) has been used to study the impact on tropospheric ozone caused by NOx emissions from today’s fleet of subsonic aircraft (0.52 Tg(N)/yr), due to uncertainties in sources ...
    • Responses in tropospheric O3, OH and CH4 to changed emissions of important trace gases 

      Fuglestvedt, Jan S.; Berntsen, Terje; Isaksen, Ivar S. A. (CICERO Report;1993:04, Research report, 1993)
      A two-dimensional (altitude vs. latitude) photochemical/transport model of the global troposphere is applied to study the effects of changed emissions of NOx, CH4, CO2 and NMHC on the levels of O3, OH and CH4. On a mass ...