CICERO - Center for International Climate Research

Phone: +47 22 00 47 65 /



PhD from the Department of Geosciences, UiO 2012



  • ICOS-Norge Integrated Carbon Observation System (ICOS)-Norway and Ocean Thematic Centre (OTC)
  • Key Earth System Processes to understand Arctic Climate Warming (KeyClim) The objective of the KeyCLIM project is to develop The Norwegian Earth System Model (NorESM) to assess performance, develop and evaluate physical processes in the modell. A special effort is addressed to the near and long term future climate for the Artic, northern latitudes and Norway. Open data from the project will be provided to the climate mitigation and climate impact community.
  • CICERO to study the climate impacts of hydrogen emissions Hydrogen is often considered a green energy carrier that has the potential to replace oil, but little is known about its environmental and climate impacts. Over the next three years, CICERO will therefore study what these impacts are.
  • UTRICS Global temperatures are rising due to the accumulation of greenhouse gases in the atmosphere. In addition to increasing greenhouse gas emissions, human activity has changed the composition of particles in the atmosphere. These have masked some of the warming caused by the greenhouse gases. How large is this cooling effect, and how has it changed over time?

Publications and outreach at CICERO

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Journal article


  • Wenying Su, Lusheng Liang, Gunnar Myhre, Tyler J. Thorsen, Norman G. Loeb, Gregory L. Schuster, Paul Ginoux, Fabien Paulot, David Neubauer, Ramiro Checa-Garcia, Hitoshi Matsui, Kostas Tsigaridis, Ragnhild Bieltvedt Skeie, Toshihiko Takemura, Susanne E. Bauer, M Schulz, 2021 Understanding Top-of-Atmosphere Flux Bias in the AeroCom Phase III Models: A Clear-Sky Perspective Journal of Advances in Modeling Earth Systems, EN
  • Chris D. Jones, Jonathan Hickman, Steven T Rumbold, Jeremy Walton, Robin Lamboll, Ragnhild Bieltvedt Skeie, Stephanie Fiedler, Piers M. Forster, Joeri Rogelj, Manabu Abe, Michael Botzet, Katherine Calvin, Christophe Cassou, Jason N S Cole, Paolo Davini, Makoto Deushi, Martin Dix, J. C. Fyfe, Nathan P. Gillett, Tatiana Ilyina, Michio Kawamiya, Maxwell Kelley, Slava Kharin, Tsuyoshi Koshiro, Hongmei Li, Chloe MacKallah, Wolfgang A. Müller, Pierre Nabat, Twan Van Noije, Paul Nolan, Rumi Ohgaito, Dirk Jan Leo Oliviè, Naga Oshima, Jose Parodi, Thomas J. Reerink, Lili Ren, Anastasia Romanou, Roland Séférian, Yangming Tang, Claudia Timmreck, Jerry Tjiputra, Etienne Tourigny, Kostas Tsigaridis, Hailong Wang, Mingxuan Wu, Klaus Wyser, Shuting Yang, Yang Yang, Tilo Ziehn, 2021 The Climate Response to Emissions Reductions Due to COVID-19: Initial Results From CovidMIP Geophysical Research Letters, EN
  • Gillian Thornhill, William J. Collins, Dirk Jan Leo Oliviè, Ragnhild Bieltvedt Skeie, Alexander T. Archibald, Susanne E. Bauer, Ramiro Checa-Garcia, Stephanie Fiedler, Gerd Folberth, Ada Gjermundsen, Larry Horowitz, Jean-Francois Lamarque, Martine Michou, Jane Mulcahy, Pierre Nabat, Vaishali Naik, Fiona M. O'Connor, Fabien Paulot, M Schulz, Catherine E. Scott, Roland Séférian, Christopher J. Smith, Toshihiko Takemura, Simone Tilmes, Kostas Tsigaridis, James Weber, 2021 Climate-driven chemistry and aerosol feedbacks in CMIP6 Earth system models Atmospheric Chemistry and Physics (ACP), Copernicus GmbH, EN
  • Gillian D. Thornhill, William J. Collins, Ryan J. Kramer, Dirk Jan Leo Oliviè, Ragnhild Bieltvedt Skeie, Fiona M. O'Connor, Nathan Luke Abraham, Ramiro Checa-Garcia, Susanne E. Bauer, Makoto Deushi, Louisa Emmons, Piers M. Forster, Larry W. Horowitz, Ben Johnson, James Keeble, Jean-Francois Lamarque, Martine Michou, Michael J. Mills, Jane P. Mulcahy, Gunnar Myhre, Pierre Nabat, Vaishali Naik, Naga Oshima, M Schulz, Christopher J. Smith, Toshihiko Takemura, Simone Tilmes, Tongwen Wu, Guang Zeng, Jie Zhang, 2021 Effective radiative forcing from emissions of reactive gases and aerosols-A multi-model comparison Atmospheric Chemistry and Physics (ACP), Copernicus GmbH, EN
  • Hunter Brown, Xiaohong Liu, Rudra Pokhrel, Shane Murphy, Zheng Lu, Rawad Saleh, Tero Mielonen, Harri Kokkola, Tommi Bergman, Gunnar Myhre, Ragnhild Bieltvedt Skeie, Duncan Watson-Parris, Philip Stier, Ben Johnson, Nicolas Bellouin, M Schulz, Ville Vakkari, J. P. Beukes, Pieter Gideon van Zyl, Shang Liu, Duli Chand, 2021 Biomass burning aerosols in most climate models are too absorbing Nature Communications, Nature Portfolio, EN


  • Zebedee R. J. Nicholls, Malte Meinshausen, Jared Lewis, Robert Gieseke, Dietmar Dommenget, Kalyn Dorheim, Chen-Shuo Fan, Jan Fuglestvedt, Thomas Gasser, Ulrich Golüke, Philip Goodwin, Corinne Hartin, Austin P. Hope, Elmar Kriegler, Nicholas J. Leach, Davide Marchegiani, Laura A. McBride, Yann Quilcaille, Joeri Rogelj, Ross J. Salawitch, Bjørn Hallvard Samset, Marit Sandstad, Alexey N. Shiklomanov, Ragnhild Bieltvedt Skeie, Christopher J. Smith, Steven J. Smith, Katsumasa Tanaka, Junichi Tsutsui, Zhiang Xie, 2020 Reduced Complexity Model Intercomparison Project Phase 1: Introduction and evaluation of global-mean temperature response Geoscientific Model Development, Copernicus GmbH, EN
  • Augustin Mortier, Jonas Gliss, M Schulz, Wenche Aas, Elisabeth Andrews, Huisheng Bian, Mian Chin, Paul Ginoux, Jenny Hand, Brent Holben, Hua Zhang, Zak Kipling, Alf Kirkevåg, Paolo Laj, Thibault Lurton, Gunnar Myhre, David Neubauer, Dirk Jan Leo Oliviè, K. von Salzen, Ragnhild Bieltvedt Skeie, Toshihiko Takemura, Simone Tilmes, 2020 Evaluation of climate model aerosol trends with ground-based observations over the last 2 decades – an AeroCom and CMIP6 analysis Atmospheric Chemistry and Physics (ACP), Copernicus GmbH, EN
  • Ragnhild Bieltvedt Skeie, Gunnar Myhre, Øivind Hodnebrog, Philip J. Cameron-Smith, Makoto Deushi, Michaela I. Hegglin, Larry W. Horowitz, Ryan J. Kramer, Martine Michou, Michael J. Mills, Dirk Jan Leo Oliviè, Fiona M. O’Connor, David Paynter, Bjørn Hallvard Samset, Alistair Sellar, Drew Shindell, Toshihiko Takemura, Simone Tilmes, Tongwen Wu, 2020 Historical total ozone radiative forcing derived from CMIP6 simulations npj Climate and Atmospheric Science, Nature Portfolio, EN
  • Gunnar Myhre, Bjørn Hallvard Samset, Christian Wilhelm Mohr, Kari Alterskjær, Yves Balkanski, Nicolas Bellouin, Mian Chin, James Haywood, Øivind Hodnebrog, Stefan Kinne, Guangxing Lin, Marianne Tronstad Lund, Joyce E. Penner, M Schulz, Nick Schutgens, Ragnhild Bieltvedt Skeie, Philip Stier, Toshihiko Takemura, Kai Zhang, 2020 Cloudy-sky contributions to the direct aerosol effect Atmospheric Chemistry and Physics (ACP), Copernicus GmbH, EN


  • Wenche Aas, Augustin Mortier, Van C. Bowersox, Ribu Cherian, Greg Faluvegi, Hilde Fagerli, Jenny Hand, Zbigniew Klimont, Corinne Galy-Lacaux, Christopher M.B. Lehmann, Cathrine Lund Myhre, Gunnar Myhre, Dirk Jan Leo Oliviè, Keiichi Sato, Johannes Quaas, Pasumarthi Surya Prakasa Rao, M Schulz, Drew Shindell, Ragnhild Bieltvedt Skeie, Ariel Stein, Toshihiko Takemura, Svetlana G. Tsyro, Robert Vet, Xiaobin Xu, 2019 Global and regional trends of atmospheric sulfur Scientific Reports, Nature Portfolio, EN






  • K Tsigaridis, N Daskalakis, M Kanakidou, Peter J. Adams, Paulo Artaxo, R Bahadur, Yves Balkanski, S. E. Bauer, Nicolas Bellouin, Anna Benedetti, Tommi Bergman, Terje K. Berntsen, J. P. Beukes, H Bian, K Carslaw, Mian Chin, G Curci, Thomas Diehl, Richard C. Easter, Steven John Ghan, SL Gong, A Hodzic, CR Hoyle, Trond Iversen, S Jathar, J. L. Jimenez, Johannes W. Kaiser, Alf Kirkevåg, D Koch, Harri Kokkola, Y.H. Lee, G Lin, X Liu, G Luo, X Ma, Graham W. Mann, N Mihalopoulos, J.J Morcrette, JF Muller, Gunnar Myhre, S Myriokefalitakis, NL Ng, D O'Donnell, J.E. Penner, L Pozzoli, Kirsty J. Pringle, LM Russell, M Schulz, J. Sciare, Øyvind Seland, Drew T. Shindell, Sanford Sillman, Ragnhild Bieltvedt Skeie, D Spracklen, T Stavrakou, S Steenrod, Toshihiko Takemura, P Tiitta, S Tilmes, Holger Tost, T Van Noije, P. G. van Zyl, Knut von Salzen, F. Yu, Z Wang, Z. Wang, Rahul A. Zaveri, H Zhang, K Zhang, Q Zhang, X Zhang, 2014 The AeroCom evaluation and intercomparison of organic aerosol in global models Atmospheric Chemistry and Physics (ACP), Copernicus GmbH, EN
  • C Jiao, M Flanner, Y Balkanski, S. Bauer, N Bellouin, Terje K. Berntsen, H Bian, K Carslaw, M Chin, N De Luca, T Diehl, S Ghan, Trond Iversen, A Kirkevag, D Koch, X Liu, G Mann, J Penner, G Pitari, M Schulz, Øyvind Seland, Ragnhild Bieltvedt Skeie, S Steenrod, P Stier, T Takemura, K Tsigaridis, T Van Noije, Y Yun, K Zhang, 2014 An aerocom assessment of black carbon in Arctic snow and sea ice Atmospheric Chemistry and Physics (ACP), Copernicus GmbH, EN
  • V. A. Dutkiewicz, A. M. DeJulio, T Ahmed, J Laing, P. K. Hopke, Ragnhild Bieltvedt Skeie, Y Viisanen, J. Paatero, Liaquat Husain, 2014 Forty-seven years of weekly atmospheric black carbon measurements in the Finnish Arctic: Decrease in black carbon with declining emissions Journal of Geophysical Research (JGR): Atmospheres, EN
  • Ragnhild Bieltvedt Skeie, Terje K. Berntsen, Magne Aldrin, Marit Holden, Gunnar Myhre, 2014 A lower and more constrained estimate of climate sensitivity using updated observations and detailed radiative forcing time series Earth System Dynamics, Copernicus GmbH, EN
  • Bjørn Hallvard Samset, Gunnar Myhre, Andreas Herber, Yutaka Kondo, Shao-Meng Li, Nobuhiro Moteki, Makoto Koike, Naga Oshima, Joshua P. Schwarz, Yves Balkanski, Susanne E. Bauer, Nicolas Bellouin, Terje K. Berntsen, Huisheng Bian, Mian Chin, Thomas Diehl, Richard C. Easter, Steven John Ghan, Trond Iversen, Alf Kirkevåg, Jean-François Lamarque, Guangxing Lin, Xiaohong Liu, Joyce E. Penner, M Schulz, Øyvind Seland, Ragnhild Bieltvedt Skeie, Philip Stier, Toshihiko Takemura, Kostas Tsigaridis, Kai Zhang, 2014 Modelled black carbon radiative forcing and atmospheric lifetime in AeroCom Phase II constrained by aircraft observations Atmospheric Chemistry and Physics (ACP), Copernicus GmbH, EN







  • Jan Fuglestvedt, Terje K. Berntsen, Gunnar Myhre, Kristin Rypdal, Ragnhild Bieltvedt Skeie, 2008 Climate forcing from the transport sectors Proceedings of the National Academy of Sciences of the United States of America, The National Academy of Sciences, EN