Browsing Institutt for geofag by Author "Myhre, Gunnar"

Now showing items 1-13 of 13

  • Aerosol absorption in global models from AeroCom phase III 
    Sand, Maria; Samset, Bjørn Hallvard; Myhre, Gunnar; Gliss, Jonas; Bauer, Susanne E.; Bian, Huisheng; Chin, Mian; Checa-Garcia, Ramiro; Ginoux, Paul; Kipling, Zak; Kirkevåg, Alf; Kokkola, Harri; Le Sager, Philippe; Lund, Marianne Tronstad; Matsui, Hitoshi; Van Noije, Twan; Oliviè, Dirk Jan Leo; Rémy, Samuel; Schulz, Michael; Stier, Philip; Stjern, Camilla Weum; Takemura, Toshihiko; Tsigaridis, Kostas; Tsyro, Svetlana; Watson-Parris, Duncan (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Aerosol-induced absorption of shortwave radiation can modify the climate through local atmospheric heating, which affects lapse rates, precipitation, and cloud formation. Presently, the total amount of aerosol absorption ...
  • 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 ...
  • 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 (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Atmospheric aerosols from anthropogenic and natural sources reach the polar regions through long-range transport and affect the local radiation balance. Such transport is, however, poorly constrained in present-day global ...
  • 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 ...
  • 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. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 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 ...
  • Bounding global aerosol radiative forcing of climate change 
    Bellouin, Nicolas; Quaas, Johannes; Gryspeerdt, Edward; Kinne, Stephan A.; Stier, Philip; Watson-Parris, Duncan; Boucher, Oliviér; Carslaw, Kenneth S.; Christensen, Matthew W.; Daniau, Anne-Laure; Dufresne, Jean-Louis; Feingold, Graham; Fiedler, Stephanie; Forster, Piers Maxwell; Gettelman, Andrew; Haywood, Jim M.; Lohmann, Ulrike; Malavelle, Florent F.; Mauritsen, Thorsten; McCoy, Daniel T.; Myhre, Gunnar; Mülmenstädt, Johannes; Neubauer, David; Possner, Anna; Rugenstein, Maria A.A.; Sato, Yousuke; Schulz, Michael; Schwartz, Stephen E.; Sourdeval, Odran; Storelvmo, Trude; Toll, Velle; Winker, David M.; Stevens, Björn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Aerosols interact with radiation and clouds. Substantial progress made over the past 40 years in observing, understanding, and modeling these processes helped quantify the imbalance in the Earth's radiation budget caused ...
  • 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 (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 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 ...
  • Energy Budget Constraints on the Time History of Aerosol Forcing and Climate Sensitivity 
    Smith, Christopher J.; Harris, Glen R.; Palmer, Matthew D.; Bellouin, Nicolas; Collins, William J.; Myhre, Gunnar; Schulz, Michael; Golaz, Jean-Christophe; Ringer, Mark; Storelvmo, Trude; Forster, Piers M. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    An observationally constrained time series of historical aerosol effective radiative forcing (ERF) from 1750 to 2019 is developed in this study. We find that the time history of aerosol ERFs diagnosed in CMIP6 models ...
  • 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. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 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, ...
  • Extensive reduction of surface UV radiation since 1750 in world's populated regions 
    Kvalevåg, Maria Malene; Myhre, Gunnar; Myhre, Cathrine Lund (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2009)
    Human activity influences a wide range of components that affect the surface UV radiation levels, among them ozone at high latitudes. We calculate the effect of human-induced changes in the surface erythemally weighted ...
  • 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 ...
  • Radiative forcing of the direct aerosol effect from AeroCom Phase II simulations 
    Myhre, Gunnar; Samset, Bjørn Hallvard; Schulz, M.; Balkanski, Y.; Bauer, S.; Berntsen, Terje Koren; Bian, H.; Bellouin, N; Chin, M; Diehl, T; Easter, R. C.; Feichter, J; Ghan, SJ; Hauglustaine, D; Iversen, Trond; Kinne, S; Kirkevåg, A; Lamarque, J. F.; Lin, G; Liu, X.; Lund, Marianne Tronstad; Luo, G; Ma, X; van Noije, T; Penner, JE; Rasch, P. J.; Ruiz, A.; Seland, Ø.; Skeie, Ragnhild Bieltvedt; Stier, P; Takemura, T.; Tsigaridis, K; Wang, P.; Wang, Z; Xu, L.; Yu, H; Yu, F.; Yoon, J.-H.; Zhang, K.; Zhang, H.; Zhou, C. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
    We report on the AeroCom Phase II direct aerosol effect (DAE) experiment where 16 detailed global aerosol models have been used to simulate the changes in the aerosol distribution over the industrial era. All 16 models ...
  • Twenty-five years of continuous sulphur dioxide emission reduction in Europe 
    Vestreng, Vigdis; Myhre, Gunnar; Fagerli, Hilde; Reis, Stefan; Tarrason, Leonor (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2007)
    During the last twenty-five years European emission data have been compiled and reported under the Cooperative Programme for Monitoring and Evaluation of the Long-range Transmission of Air Pollutants in Europe (EMEP) as ...