Blar i CICERO Research Archive på forfatter "Myhre, Gunnar"
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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, ... -
Frequency of extreme precipitation increases extensively with event rareness under global warming
Myhre, Gunnar; Alterskjær, Kari; Stjern, Camilla Weum; Hodnebrog, Øivind; Marelle, Louis; Samset, Bjørn Hallvard; Sillmann, Jana; Schaller, Nathalie; Fischer, Erich; Schulz, Michael; Stohl, Andreas (Journal article; Peer reviewed, 2019)The intensity of the heaviest extreme precipitation events is known to increase with global warming. How often such events occur in a warmer world is however less well established, and the combined effect of changes in ... -
Future urban heat island influence on precipitation
Steensen, Birthe Marie Rødssæteren; Marelle-Sebrechts, Louis; Hodnebrog, Øivind; Myhre, Gunnar (Journal article; Peer reviewed, 2022)Urbanization and global warming are two of the major human impacts on the environment. The Urban Heat Island (UHI) effect can change precipitation patterns. Global warming also leads to changes in precipitation and especially ... -
Global and regional radiative forcing from 20 % reductions in BC, OC and SO4 - An HTAP2 multi-model study
Stjern, Camilla Weum; Samset, Bjørn Hallvard; Myhre, Gunnar; Bian, Huisheng; Chin, Mian; Davila, Yanko; Dentener, Frank; Emmons, Louisa; Flemming, Johannes; Haslerud, Amund Søvde; Henze, Daven; Jonson, Jan Eiof; Kucsera, Tom; Lund, Marianne Tronstad; Schulz, Michael; Sudo, Kengo; Takemura, Toshihiko; Tilmes, Simone (Peer reviewed; Journal article, 2016)In the Hemispheric Transport of Air Pollution Phase 2 (HTAP2) exercise, a range of global atmospheric general circulation and chemical transport models performed coordinated perturbation experiments with 20 % reductions ... -
Global and regional trends of atmospheric sulfur
Aas, Wenche; Mortier, Augustin; Bowersox, Van C.; Cherian, Ribu; Faluvegi, Greg; Fagerli, Hilde; Hand, Jenny; Klimont, Zbigniew; Galy-Lacaux, Corinne; Lehmann, Christopher M. B.; Myhre, Cathrine Lund; Myhre, Gunnar; Oliviè, Dirk Jan Leo; Sato, Keiichi; Quaas, Johannes; Rao, P.S.P.; Schulz, Michael; Shindell, Drew; Skeie, Ragnhild Bieltvedt; Stein, Ariel; Takemura, Toshihiko; Tsyro, Svetlana; Vet, Robert; Xu, Xiaobin (Peer reviewed; Journal article, 2019)The profound changes in global SO2 emissions over the last decades have affected atmospheric composition on a regional and global scale with large impact on air quality, atmospheric deposition and the radiative forcing of ... -
A global model–measurement evaluation of particle light scattering coefficients at elevated relative humidity,
Burgos, María A.; Andrews, Elisabeth; Titos, Gloria; Benedetti, Angela; Bian, Huisheng; Buchard, Virginie; Curci, Gabriele; Kipling, Zak; Kirkevåg, Alf; Kokkola, Harri; Laakso, Anton; Letertre-Danczak, Julie; Lund, Marianne Tronstad; Matsui, Hitoshi; Myhre, Gunnar; Randles, Cynthia; Schulz, Michael; Noije, Twan van; Zhang, Kai; Alados-Arboledas, Lucas; Baltensperger, Urs; Jefferson, Anne; Sherman, James; Sun, Junying; Weingartner, Ernest; Zieger, Paul (Journal article; Peer reviewed, 2020)The uptake of water by atmospheric aerosols has a pronounced effect on particle light scattering properties, which in turn are strongly dependent on the ambient relative humidity (RH). Earth system models need to account ... -
Historical total ozone radiative forcing derived from CMIP6 simulations
Skeie, Ragnhild Bieltvedt; Myhre, Gunnar; Hodnebrog, Øivind; Cameron-Smith, Philip J.; Deushi, Makoto; Hegglin, Michaela I.; Horowitz, Larry W.; Kramer, Ryan J.; Michou, Martine; Mills, Michael J.; Oliviè, Dirk Jan Leo; O’Connor, Fiona M.; Paynter, David; Samset, Bjørn Hallvard; Sellar, Alistair; Shindell, Drew; Takemura, Toshihiko; Tilmes, Simone; Wu, Tongwen (Journal article; Peer reviewed, 2020)Radiative forcing (RF) time series for total ozone from 1850 up to the present day are calculated based on historical simulations of ozone from 10 climate models contributing to the Coupled Model Intercomparison Project ... -
How aerosols and greenhouse gases influence the diurnal temperature range
Stjern, Camilla Weum; Samset, Bjørn Hallvard; Boucher, Olivier; Iversen, Trond; Lamarque, Jean-Francois; Myhre, Gunnar; Shindell, Drew; Takemura, Toshihiko (Journal article; Peer reviewed, 2020)The diurnal temperature range (DTR) (or difference between the maximum and minimum temperature within a day) is one of many climate parameters that affects health, agriculture and society. Understanding how DTR evolves ... -
Implications of differences between recent anthropogenic aerosol emission inventories for diagnosed AOD and radiative forcing from 1990 to 2019
Lund, Marianne Tronstad; Myhre, Gunnar; Skeie, Ragnhild Bieltvedt; Samset, Bjørn Hallvard; Klimont, Zbigniew (Peer reviewed; Journal article, 2023)This study focuses on implications of differences between recent global emissions inventories for simulated trends in anthropogenic aerosol abundances and radiative forcing (RF) over the 1990–2019 period. We use the ECLIPSE ... -
Inferring Surface Albedo Prediction Error Linked to Forest Structure at High Latitudes
Bright, Ryan M.; Eisner, Stephanie; Lund, Marianne Tronstad; Majasalmi, Titta; Myhre, Gunnar; Astrup, Rasmus Andreas (Peer reviewed; Journal article, 2018)Predicting the surface albedo of a forest of a given species composition or plant functional type is complicated by the wide range of structural attributes it may display. Accurate characterizations of forest structure are ... -
Land cover change in low-warming scenarios may enhance the climate role of secondary organic aerosols
Lund, Marianne Tronstad; Rap, Alexandru; Myhre, Gunnar; Søvde, Ole Amund; Samset, Bjørn Hallvard (Peer reviewed; Journal article, 2021)Most socioeconomic pathways compatible with the aims of the Paris Agreement include large changes to land use and land cover. The associated vegetation changes can interact with the atmosphere and climate through numerous ... -
Local biomass burning is a dominant cause of the observed precipitation reduction in southern Africa
Hodnebrog, Øivind; Myhre, Gunnar; Forster, Piers M.; Sillmann, Jana; Samset, Bjørn Hallvard (Peer reviewed; Journal article, 2016)Observations indicate a precipitation decline over large parts of southern Africa since the 1950s. Concurrently, atmospheric concentrations of greenhouse gases and aerosols have increased due to anthropogenic activities. ... -
A machine learning examination of hydroxyl radical differences among model simulations for CCMI-1
Nicely, Julie M.; Duncan, Bryan; Hanisco, Thomas F.; Wolfe, Glenn M.; Salawitch, Ross J.; Deushi, Makoto; Haslerud, Amund Søvde; Jöckel, Patrick; Josse, Béatrice; Kinnison, Douglas E.; Klekociuk, Andrew; Manyin, Michael E.; Marécal, Virginie; Morgenstern, Olaf; Murray, Lee T.; Myhre, Gunnar; Oman, Luke D.; Pitari, Giovanni; Pozzer, Andrea; Quaglia, Ilaria; Revell, Laura E.; Rozanov, Eugene; Stenke, Andrea; Stone, Kane; Strahan, Susan E.; Tilmes, Simone; Tost, Holger; Westervelt, Daniel M.; Zeng, Guang (Journal article; Peer reviewed, 2020)The hydroxyl radical (OH) plays critical roles within the troposphere, such as determining the lifetime of methane (CH4), yet is challenging to model due to its fast cycling and dependence on a multitude of sources and ... -
A multi-model assessment of the Global Warming Potential of hydrogen
Sand, Maria; Skeie, Ragnhild Bieltvedt; Sandstad, Marit; Krishnan, Srinath; Myhre, Gunnar; Bryant, Hannah; Derwent, Richard; Hauglustaine, Didier; Paulot, Fabien; Prather, Michael; Stevenson, David (Peer reviewed; Journal article, 2023)With increasing global interest in molecular hydrogen to replace fossil fuels, more attention is being paid to potential leakages of hydrogen into the atmosphere and its environmental consequences. Hydrogen is not directly ... -
Multi-model simulations of aerosol and ozone radiative forcing due to anthropogenic emission changes during the period 1990-2015
Myhre, Gunnar; Aas, Wenche; Cherian, Ribu; Collins, W; Faluvegi, Greg; Flanner, M.; Forster, Piers M.; Hodnebrog, Øivind; Klimont, Zbigniew; Lund, Marianne Tronstad; Mulmenstädt, Johannes; Myhre, Cathrine Lund; Oliviè, Dirk Jan Leo; Prather, Michael J.; Quaas, Johannes; Samset, Bjørn Hallvard; Schnell, Jordan; Schulz, Michael; Shindell, Drew; Skeie, Ragnhild Bieltvedt; Takemura, Toshihiko; Tsyro, Svetlana G. (Peer reviewed; Journal article, 2017)Over the past few decades, the geographical distribution of emissions of substances that alter the atmospheric energy balance has changed due to economic growth and air pollution regulations. Here, we show the resulting ... -
Natural short-lived halogens exert an indirect cooling effect on climate
Saiz-Lopez, Alfonso; Fernandez, Rafael P.; Li, Qinyi; Cuevas, Carlos A.; Fu, Xiao; Kinnison, Douglas E.; Tilmes, Simone; Mahajan, Anoop S.; Gómez Martín, Juan Carlos; Iglesias-Suarez, Fernando; Hossaini, Ryan; Plane, John M. C.; Myhre, Gunnar; Lamarque, Jean-François (Peer reviewed; Journal article, 2023)Observational evidence shows the ubiquitous presence of ocean-emitted short-lived halogens in the global atmosphere1,2,3. Natural emissions of these chemical compounds have been anthropogenically amplified since pre-industrial ... -
Observational Evidence of Increasing Global Radiative Forcing
Kramer, Ryan J.; He, Haozhe; Soden, Brian J.; Oreopoulos, Lazaros; Myhre, Gunnar; Forster, Piers M.; Smith, Christopher J. (Journal article; Peer reviewed, 2021)Changes in atmospheric composition, such as increasing greenhouse gases, cause an initial radiative imbalance to the climate system, quantified as the instantaneous radiative forcing. This fundamental metric has not been ... -
Radiative forcing bias of simulated surface albedo modifications linked to forest cover changes at northern latitudes
Bright, Ryan M.; Myhre, Gunnar; Astrup, Rasmus Andreas; Antón-Fernández, Clara; Strømman, Anders Hammer (Peer reviewed; Journal article, 2015) -
Radiative forcing in the ACCMIP historical and future climate simulations
Shindell, D.T.; Lamarque, J.-F.; Schulz, M.; Flanner, M.; Jiao, C.; Chin, M.; Young, P.J.; Lee, Y.H.; Rotstayn, L.; Mahowald, N.; Milly, G.; Faluvegi, G.; Balkanski, Y.; Collins, W.J.; Conley, A.J.; Dalsøren, Stig Bjørløw; Easter, R.; Ghan, S.; Horowitz, L.; Liu, X.; Myhre, Gunnar; Nagashima, T.; Naik, V.; Rumbold, S.T.; Skeie, Ragnhild Bieltvedt; Sudo, K.; Szopa, S.; Takemura, T.; Voulgarakis, A.; Yoon, J.-H.; Lo, F. (Peer reviewed; Journal article, 2013)The Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP) examined the short-lived drivers of climate change in current climate models. Here we evaluate the 10 ACCMIP models that included aerosols, 8 of ... -
Radiative forcing of climate change from the Copernicus reanalysis of atmospheric composition
Bellouin, Nicolas; Davies, William H.; P. Shine, Keith; Quaas, Johannes; Mülmenstädt, Johannes; M. Forster, Piers; Smith, Christopher J.; Lee, Lindsay; Regayre, Leighton; Brasseur, Guy; Sudarchikova, Natalia; Bouarar, Idir; Boucher, Olivier; Myhre, Gunnar (Journal article; Peer reviewed, 2020)Radiative forcing provides an important basis for understanding and predicting global climate changes, but its quantification has historically been done independently for different forcing agents, has involved observations ...