Blar i Journal articles på forfatter "Samset, Bjørn Hallvard"
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Evaluating global and regional land warming trends in the past decades with both MODIS and ERA5-Land land surface temperature data
Wang, You-Ren; Hessen, Dag; Samset, Bjørn Hallvard; Stordal, Frode (Peer reviewed; Journal article, 2022)Global surface temperature has been setting new record highs in the recent decades, imposing increasing environmental challenges for societies and ecosystems worldwide. Global warming rates of the 20th century have been ... -
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 ... -
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 ... -
A “greenhouse gas balance” for aviation in line with the Paris Agreement
Fuglestvedt, Jan S.; Lund, Marianne Tronstad; Kallbekken, Steffen; Samset, Bjørn Hallvard; Lee, David S. (Peer reviewed; Journal article, 2023)The effects of aviation on climate pose unique policy challenges. A large fraction of the CO2 emissions (65%) is international and not (explicitly) included in the Paris Agreement. The interpretation of Article 4.1 on ... -
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 ... -
The IPCC Sixth Assessment Report WGIII climate assessment of mitigation pathways: from emissions to global temperatures
Kikstra, Jarmo S.; Nicholls, Zebedee R. J.; Smith, Christopher J.; Lewis, Jared; Lamboll, Robin D.; Byers, Edward; Sandstad, Marit; Meinshausen, Malte; Gidden, Matthew J.; Rogelj, Joeri; Kriegler, Elmar; Peters, Glen Philip; Fuglestvedt, Jan S.; Skeie, Ragnhild Bieltvedt; Samset, Bjørn Hallvard; Wienpahl, Laura; Van Vuuren, Detlef P.; Van Der Wijst, Kaj-Ivar; Al Khourdajie, Alaa; Forster, Piers M.; Reisinger, Andy; Schaeffer, Roberto; Riahi, Keywan (Peer reviewed; Journal article, 2022)While the Intergovernmental Panel on Climate Change (IPCC) physical science reports usually assess a handful of future scenarios, the Working Group III contribution on climate mitigation to the IPCC's Sixth Assessment ... -
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. ... -
Modifying emissions scenario projections to account for the effects of COVID-19: Protocol for CovidMIP
Lamboll, Robin; Jones, Chris D.; Skeie, Ragnhild Bieltvedt; Fiedler, Stephanie; Samset, Bjørn Hallvard; Gillett, Nathan P.; Rogelj, Joeri; Forster, Piers M. (Journal article; Peer reviewed, 2021)Lockdowns to avoid the spread of COVID-19 have created an unprecedented reduction in human emissions. While the country-level scale of emissions changes can be estimated in near real time, the more detailed, gridded emissions ... -
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 ... -
Observations suggest that North African dust absorbs less solar radiation than models estimate
Adebiyi, Adeyemi A.; Huang, Yue; Samset, Bjørn Hallvard; Kok, Jasper F. (Peer reviewed; Journal article, 2023)Desert dust accounts for a large fraction of shortwave radiation absorbed by aerosols, which adds to the climate warming produced by greenhouse gases. However, it remains uncertain exactly how much shortwave radiation dust ... -
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. (Peer reviewed; Journal article, 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 ... -
Rapidly evolving aerosol emissions are a dangerous omission from near-term climate risk assessments
Persad, Geeta G.; Samset, Bjørn Hallvard; Wilcox, Laura J.; Allen, Robert J.; Bollasina, Massimo A.; Booth, Ben B. B.; Bonfils, Céline; Crocker, Tom; Joshi, Manoj M.; Lund, Marianne Tronstad; Marvel, Kate D.; Merikanto, Joonas; Nordling, Kalle; Undorf, Sabine; Vuuren, Detlef Van; Westervelt, Daniel M.; Zhao, Alcide (Journal article, 2023)Anthropogenic aerosol emissions are expected to change rapidly over the coming decades, driving strong, spatially complex trends in temperature, hydroclimate, and extreme events both near and far from emission sources. ... -
Recommendations for diagnosing effective radiative forcing from climate models for CMIP6
Forster, Piers M.; Richardson, T.; Maycock, A. C.; Smith, C. J.; Samset, Bjørn Hallvard; Myhre, Gunnar; Andrews, T.; Pincus, R.; Schulz, Michael (Journal article; Peer reviewed, 2016)The usefulness of previous Coupled Model Intercomparison Project (CMIP) exercises has been hampered by a lack of radiative forcing information. This has made it difficult to understand reasons for differences between model ... -
The Regional Aerosol Model Intercomparison Project (RAMIP)
Wilcox, Laura J.; Allen, Robert J.; Samset, Bjørn Hallvard; Bollasina, Massimo A.; Griffiths, Paul T.; Keeble, James; Lund, Marianne Tronstad; Makkonen, Risto; Merikanto, Joonas; O'Donnell, Declan; Paynter, David J.; Persad, Geeta G.; Rumbold, Steven T.; Takemura, Toshihiko; Tsigaridis, Kostas; Undorf, Sabine; Westervelt, Daniel M. (Peer reviewed; Journal article, 2023)Changes in anthropogenic aerosol emissions have strongly contributed to global and regional trends in temperature, precipitation, and other climate characteristics and have been one of the dominant drivers of decadal trends ... -
Reply to: Uncertainty in near-term temperature evolution must not obscure assessments of climate mitigation benefits
Samset, Bjørn Hallvard; Fuglestvedt, Jan S.; Lund, Marianne Tronstad (Peer reviewed; Journal article, 2022)In response to our recent paper1 (hereafter SFL20) concerning the relation between natural variability in the climate system and the time to detect a response to emissions mitigation, Lanson et al.2 (hereafter L22) call ... -
The Representation of Sea Salt Aerosols and Their Role in Polar Climate Within CMIP6
Lapere, Rémy; Thomas, Jennie L.; Marelle, Louis; Ekman, Annica M. L.; Frey, Markus M.; Lund, Marianne Tronstad; Makkonen, Risto; Ranjithkumar, Ananth; Salter, Matthew E.; Samset, Bjørn Hallvard; Schulz, Michael; Sogacheva, Larisa; Yang, Xin; Zieger, Paul (Peer reviewed; Journal article, 2023)Natural aerosols and their interactions with clouds remain an important uncertainty within climate models, especially at the poles. Here, we study the behavior of sea salt aerosols (SSaer) in the Arctic and Antarctic within ... -
A review of coarse mineral dust in the Earth system
Adebiyi, Adeyemi; Kok, Jasper F.; Murray, Benjamin J.; Ryder, Claire L.; Stuut, Jan-Berend W.; Kahn, Ralph A.; Knippertz, Peter; Formenti, Paola; Mahowald, Natalie M.; Pérez García-Pando, Carlos; Klose, Martina; Ansmann, Albert; Samset, Bjørn Hallvard; Ito, Akinori; Balkanski, Yves; Di Biagio, Claudia; Romanias, Manolis N.; Huang, Yue; Meng, Jun (Peer reviewed; Journal article, 2023)Mineral dust particles suspended in the atmosphere span more than three orders of magnitude in diameter, from <0.1 μm to more than 100 μm. This wide size range makes dust a unique aerosol species with the ability to interact ...