• A simple model for scenario studies of changes in global climate: Version 1.0 

      Fuglestvedt, Jan S.; Berntsen, Terje Koren (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 ...
    • Aerosols at the poles: an AeroCom Phase II multi-model evaluation 

      Sand, Maria; Samset, Bjørn Hallvard; Balkanski, Yves; Bauer, Susanne; Bellouin, Nicolas; Berntsen, Terje Koren; Bian, Huisheng; Chin, Mian; Diehl, Thomas; Easter, Richard; Ghan, Steve J.; Iversen, Trond; Kirkevåg, Alf; Lamarque, Jean-Francois; Lin, Guangxing; Liu, Xiaohong; Luo, Gan; Myhre, Gunnar; Van Noije, Twan P.C.; Penner, Joyce E.; Schulz, Michael; Seland, Øyvind; Skeie, Ragnhild Bieltvedt; Stier, Philip; Takemura, Toshihiko; Tsigaridis, Kostas; Yu, Fangqun; Zhang, Kai; Zhang, Hua (Peer reviewed; Journal article, 2017)
    • An efficient and accurate carbon cycle model for use in simple climate models 

      Alfsen, Knut H.; Berntsen, Terje Koren (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. ...
    • Assessing compliance with the Kyoto Protocol: Expert reviews, inverse modelling, or both? 

      Rypdal, Kristin; Stordal, Frode; Fuglestvedt, Jan S.; Berntsen, Terje Koren (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 Koren; 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 ...
    • Black carbon vertical profiles strongly affect its radiative forcing uncertainty 

      Samset, Bjørn Hallvard; Myhre, Gunnar; Schulz, M.; Balkanski, Y.; Bauer, S.; Berntsen, Terje Koren; Bian, H.; Bellouin, N.; Diehl, T.; Easter, R.C.; Ghan, S.J.; Iversen, Trond; Kinne, S.; Kirkevåg, Alf; Lamarque, J.-F.; Lin, G.; Liu, X.; Penner, J.E.; Seland, Øyvind; Skeie, Ragnhild Bieltvedt; Stier, P.; Takemura, T.; Tsigaridis, K.; Zhang, K. (Peer reviewed; Journal article, 2013)
      The impact of black carbon (BC) aerosols on the global radiation balance is not well constrained. Here twelve global aerosol models are used to show that at least 20% of the present uncertainty in modeled BC direct radiative ...
    • BVOC-aerosol-climate feedbacks investigated using NorESM 

      Sporre, Moa Kristina; Blichner, Sara Marie; Karset, Inger Helene H.; Makkonen, Risto; Berntsen, Terje Koren (Journal article; Peer reviewed, 2019)
      Both higher temperatures and increased CO2 con centrations are (separately) expected to increase the emis sions of biogenic volatile organic compounds (BVOCs). This has been proposed to initiate negative climate feedback ...
    • Climate effects of non-compliant Volkswagen diesel cars 

      Tanaka, Katsumasa; Lund, Marianne Tronstad; Aamaas, Borgar; Berntsen, Terje Koren (Peer reviewed; Journal article, 2018)
    • Climate impacts of short-lived climate forcers versus CO2 from biodiesel: A case of the EU on-road sector 

      Lund, Marianne Tronstad; Berntsen, Terje Koren; Fuglestvedt, Jan S. (Peer reviewed; Journal article, 2014)
      Biofuels are proposed to play an important role in several mitigation strategies to meet future CO2 emission targets for the transport sector but remain controversial due to significant uncertainties in net impacts on ...
    • Climate sensitivity estimates - Sensitivity to radiative forcing time series and observational data 

      Skeie, Ragnhild Bieltvedt; Berntsen, Terje Koren; Aldrin, Magne Tommy; Holden, Marit; Myhre, Gunnar (Peer reviewed; Journal article, 2018)
      Inferred effective climate sensitivity (ECSinf) is estimated using a method combining radiative forcing (RF) time series and several series of observed ocean heat content (OHC) and near-surface temperature change in a ...
    • Climate strategy for Africa 

      Hernes, Helga; Dalfelt, Arne; Berntsen, Terje Koren; 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 Koren; 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 ...
    • CO2 emissions from biomass combustion for bioenergy: atmospheric decay and contribution to global warming 

      Cherubini, Francesco; Peters, Glen Philip; Berntsen, Terje Koren; Strømman, Anders Hammer; Hertwich, Edgar G. (Journal article; Peer reviewed, 2011)
      Carbon dioxide (CO2) emissions from biomass combustion are traditionally assumed climate neutral if the bioenergy system is carbon (C) flux neutral, i.e. the CO2 released from biofuel combustion approximately equals the ...
    • Effects of anthropogenic emissions on tropospheric ozone and its radiative forcing 

      Berntsen, Terje Koren; 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 ...
    • Elemental carbon measurements in European Arctic snow packs 

      Forsström, S.; Isaksson, Elisabeth; Skeie, Ragnhild Bieltvedt; Ström, Johan; Pedersen, CA; Hudson, S.R.; Berntsen, Terje Koren; Lihavainen, H.; Godtliebsen, Fred; Gerland, Sebastian (Journal article; Peer reviewed, 2013)
      [1] Black carbon (BC) and other light-absorbing particles deposited on snow and ice are known to perturb the surface radiative balance. There are few published observations of the concentration of these particles in the ...
    • Emission metrics for quantifying regional climate impacts of aviation 

      Lund, Marianne Tronstad; Aamaas, Borgar; Berntsen, Terje Koren; Bock, Lisa; Burkhardt, Ulrike; Fuglestvedt, Jan S.; Shine, Keith P (Peer reviewed; Journal article, 2017)
    • Estimates of future climate based on SRES emission scenarios 

      Godal, Odd; Sygna, Linda; Fuglestvedt, Jan S.; Berntsen, Terje Koren (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 ...
    • Evaluation of preindustrial to present-day black carbon and its albedo forcing from Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP) 

      Lee, Y.H.; Lamarque, J.-F.; Flanner, M.G.; Jiao, C.; Shindell, D.T.; Berntsen, Terje Koren; Bisiaux, M.M.; Cao, J.; Collins, W.J.; Curran, M.; Edwards, R.; Faluvegi, G.; Ghan, S.; Horowitz, L.W.; McConnell, J.R.; Ming, J.; Myhre, Gunnar; Nagashima, T.; Naik, V.; Rumbold, S.T.; Skeie, Ragnhild Bieltvedt; Sudo, K.; Takemura, T.; Thevenon, F.; Xu, B.; Yoon, J.-H. (Peer reviewed; Journal article, 2013)
      As part of the Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP), we evaluate the historical black carbon (BC) aerosols simulated by 8 ACCMIP models against observations including 12 ice core records, ...
    • Exploring distribution of commitments: A follow-up to the Berlin Mandate 

      Torvanger, Asbjørn; Berntsen, Terje Koren; 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 Koren; 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 ...