Browsing Institutt for geofag by Author "Isaksen, Ivar S A"

Now showing items 1-7 of 7

  • Aerosol-cloud interaction inferred from MODIS satellite data and global aerosol models 
    Myhre, Gunnar; Stordal, Frode; Johnsrud, M; Kaufman, YJ; Rosenfeld, D; Storelvmo, Trude; Kristjansson, Jon Egill; Berntsen, Terje Koren; Myhre, A; Isaksen, Ivar S A (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2007)
    We have used the MODIS satellite data and two global aerosol models to investigate the relationships between aerosol optical depth (AOD) and cloud parameters that may be affected by the aerosol concentration. The relationships ...
  • Atmospheric methane evolution the last 40 years 
    Dalsøren, Stig Bjørløw; Myhre, Cathrine Lund; Myhre, Gunnar; Gomez-Pelaez, Angel J.; Søvde, Ole Amund; Isaksen, Ivar S A; Weiss, Ray F.; Harth, Christina M. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
    Observations at surface sites show an increase in global mean surface methane (CH4) of about 180 parts per billion (ppb) (above 10 %) over the period 1984–2012. Over this period there are large fluctuations in the annual ...
  • Atmospheric Ozone and Methane in a Changing Climate 
    Isaksen, Ivar S A; Berntsen, Terje Koren; Dalsøren, Stig Bjørløw; Eleftheratos, K.; Orsolini, Yvan; Rognerud, Bjørg; Stordal, Frode; Søvde, Ole Amund; Zerefos, C; Holmes, Chris D. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    Ozone and methane are chemically active climate-forcing agents affected by climate–chemistry interactions in the atmosphere. Key chemical reactions and processes affecting ozone and methane are presented. It is shown that ...
  • Evolution of NOx emissions in Europe with focus on road transport control measures 
    Vestreng, Vigdis; Ntziachristos, Leonidas; Semb, Arne; Reis, Stefan; Isaksen, Ivar S A; Tarrason, Leonor (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2009)
    European emission trends of nitrogen oxides since 1880 and up to present are presented here and are linked to the evolution of road transport emissions. Road transport has been the dominating source of NOx emissions since ...
  • Modelled radiative forcing of the direct aerosol effect with multi-observation evaluation 
    Myhre, Gunnar; Berglen, Tore Flatlandsmo; Johnsrud, M; Hoyle, Christopher; Berntsen, Terje Koren; Christopher, SA; Fahey, DW; Isaksen, Ivar S A; Jones, TA; Kahn, RA; Loeb, N; Quinn, P; Remer, L; Schwarz, JP; Yttri, KE (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2009)
    A high-resolution global aerosol model (Oslo CTM2) driven by meteorological data and allowing a comparison with a variety of aerosol observations is used to simulate radiative forcing (RF) of the direct aerosol effect. The ...
  • Reconciliation of essential process parameters for an enhanced predictability of Arctic stratospheric ozone loss and its climate interactions (RECONCILE): activities and results 
    von Hobe, Marc; Bekki, S.; Borrmann, S.; Cairo, F.; D'Amato, F.; Di Donfrancesco, G; Dörnbrack, A.; Ebersoldt, A.; Ebert, M.; Emde, C.; Engel, I.; Ern, Manfred; Frey, W.; Genco, S.; Griessbach, S.; Grooß, J.-U.; Gulde, T.; Günther, G.; Hösen, E.; Hoffmann, L.; Homonnai, V.; Hoyle, Christopher; Isaksen, Ivar S A; Jackson, D.R.; Jánosi, I. M.; Jones, R.L.; Kandler, K; Kalicinsky, C.; Keil, A.; Khaykin, S. M.; Khosrawi, F.; Kivi, R.; Kuttippurath, J.; Laube, J. C.; Lefevre, F; Lehmann, R.; Ludmann, S.; Luo, BP; Marchand, M.; Meyer, J.; Mitev, V; Molleker, S.; Müller, R.; Oelhaf, H.; Olschewski, F.; Orsolini, Yvan; Peter, T.; Pfeilsticker, K.; Piesch, C.; Pitts, Mike C.; Poole, Lamont R.; Pope, F. D.; Ravegnani, F.; Rex, M.; Riese, M.; Rockmann, T; Rognerud, Bjørg; Roiger, A.; Rolf, C.; Santee, M. L.; Scheibe, M; Schiller, C.; Schlager, H.; Siciliani de Cumis, M.; Sitnikov, N.; Søvde, Ole Amund; Spang, R.; Spelten, N.; Stordal, Frode; Sumińska-Ebersoldt, O.; Ulanovski, A.; Ungermann, J.; Viciani, S.; Volk, C.M.; vom Scheidt, M.; von der Gathen, P.; Walker, K.; Wegner, T.; Weigel, R.; Weinbuch, S.; Wetzel, G.; Wienhold, F. G.; Wohltmann, I.; Woiwode, W.; Young, I. A. K.; Yushkov, V.; Zobrist, B.; Stroh, F. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
    The international research project RECONCILE has addressed central questions regarding polar ozone depletion, with the objective to quantify some of the most relevant yet still uncertain physical and chemical processes and ...
  • The use of QBO, ENSO, and NAO perturbations in the evaluation of GOME-2 MetOp A total ozone measurements 
    Eleftheratos, Kostas; Zerefos, Christos S.; Balis, Dimitris S.; Koukouli, Maria-Elissavet; Kapsomenakis, John; Loyola, Diego G.; Valks, Pieter; Coldewey-Egbers, Melanie; Lerot, Christophe; Frith, Stacey M.; Søvde, Ole Amund; Isaksen, Ivar S A; Hassinen, Seppo (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    In this work we present evidence that quasi-cyclical perturbations in total ozone (quasi-biennial oscillation – QBO, El Niño–Southern Oscillation – ENSO, and North Atlantic Oscillation – NAO) can be used as independent ...