Now showing items 1-19 of 19

  • Curry, Charles L.; Sillmann, Jana; Bronaugh, David; Alterskjær, Kari; Cole, Jason N.S.; Ji, Duoying; Kravitz, Ben; Kristjansson, Jon Egill; Moore, John C.; Muri, Helene Østlie; Niemeier, Ulrike; Robock, Alan; Tilmes, Simone; Yang, Shuting (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    Temperature and precipitation extremes are examined in the Geoengineering Model Intercomparison Project experiment G1, wherein an instantaneous quadrupling of CO2 from its preindustrial control value is offset by a ...
  • 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 ...
  • Blechschmidt, Anne-Marlene; Kristjansson, Jon Egill; Ólafsson, Haraldur; Burkhart, John; Hodnebrog, Øivind; Rosenberg, P.D. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2012)
    The first aircraft-based observations of an Icelandic dust storm are presented. The measurements were carried out over the ocean near Iceland's south coast in February 2007. This dust event occurred in conjunction with an ...
  • Moore, JC; Rinke, A; Yu, X; Ji, D; Cui, X; Li, Y; Alterskjær, Kari; Kristjansson, Jon Egill; Muri, Helene; Boucher, O; Huneeus, N; Kravitz, B; Robock, A; Niemeier, U; Schulz, M; Tilmes, S; Watanabe, S; Yang, S (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    We analyze simulated sea ice changes in eight different Earth System Models that have conducted experiment G1 of the Geoengineering Model Intercomparison Project (GeoMIP). The simulated response of balancing abrupt quadrupling ...
  • Storelvmo, Trude; Kristjansson, Jon Egill; Muri, Helene Østlie; Pfeffer, Melissa Anne; Barahona, Diego; Nenes, A. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
    Cirrus clouds, thin ice clouds in the upper troposphere, have a net warming effect on Earth's climate. Consequently, a reduction in cirrus cloud amount or optical thickness would cool the climate. Recent research indicates ...
  • Muri, Helene Østlie; Kristjansson, Jon Egill; Storelvmo, Trude; Pfeffer, Melissa Anne (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    The climatic effects of climate engineering—or geoengineering—via cirrus cloud thinning are examined. Thinner cirrus clouds can allow more outgoing longwave radiation to escape to space, potentially cooling the climate. ...
  • Kravitz, Ben; Rasch, Philip J.; Forster, Piers M.; Andrews, Timothy; Cole, Jason N.S.; Irvine, Peter J.; Ji, Duoying; Kristjansson, Jon Egill; Moore, John C.; Muri, Helene Østlie; Niemeier, Ulrike; Robock, Alan; Singh, Balwinder; Tilmes, Simone; Watanabe, Shingo; Yoon, Jin-Ho (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
    [1] Analysis of surface and atmospheric energy budget responses to CO2 and solar forcings can be used to reveal mechanisms of change in the hydrological cycle. We apply this energetic perspective to output from 11 fully ...
  • Sodemann, Harald; Pommier, M; Arnold, SR; Monks, SA; Stebel, Kerstin; Burkhart, John Faulkner; Hair, JW; Diskin, GS; Clerbaux, C; Coheur, PF; Hurtmans, D; Schlager, H; Blechschmidt, Anne-Marlene; Kristjansson, Jon Egill; Stohl, Andreas (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2011)
    During the POLARCAT summer campaign in 2008, two episodes (2–5 July and 7–10 July 2008) occurred where low-pressure systems traveled from Siberia across the Arctic Ocean towards the North Pole. The two cyclones had extensive ...
  • Huneeus, Nicolas; Boucher, Olivier; Alterskjær, Kari; Cole, Jason N.S.; Curry, Charles L.; Ji, Duoying; Jones, Andy; Kravitz, Ben; Kristjansson, Jon Egill; Moore, John C.; Muri, Helene; Niemeier, Ulrike; Rasch, Philip J.; Robock, Alan; Singh, Baldwinder; Schmidt, Hauke; Schulz, Michael; Tilmes, Simone; Watanabe, Shingo; Yoon, Yin-ho (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    The effective radiative forcings (including rapid adjustments) and feedbacks associated with an instantaneous quadrupling of the preindustrial CO2 concentration and a counterbalancing reduction of the solar constant are ...
  • Kulmala, Markku; Asmi, Ari; Lappalainen, H. K.; Baltensperger, Urs; Brenguier, Jean-Louis; Facchini, Cristina; Hansson, H.-C.; Hov, Øystein; O'Dowd, Colin; Pöschl, U.; Wiedensohler, A.; Boers, Reinout; Boucher, Olivier; de Leeuw, G.; Denier van der Gon, H.A.C.; Feichter, Johann; Krejci, R.; Laj, P.; Lihavainen, H.; Lohmann, Ulrike; McFiggans, Gordon; Mentel, Thomas; Pilinis, C.; Riipinen, Ilona; Schulz, Michael; Stohl, Andreas; Swietlicki, Erik; Vignati, Elisabetta; Alves, C.; Amann, M.; Ammann, M.; Arabas, Sylvester; Artaxo, P.; Baars, H.; Beddows, D.C.S.; Bergström, R.; Beukes, J. P.; Bilde, Merete; Burkhart, John Faulkner; Canonaco, F.; Clegg, S. L.; Coe, H.; Crumeyrolle, S.; D'Anna, Barbara; Decesari, S.; Gilardoni, S.; Fischer, M.; Fjæraa, Ann-Mari; Fountoukis, C.; George, C.; Gomes, L.; Halloran, P.; Hamburger, T.; Harrison, R. M.; Herrmann, H.; Hoffmann, T.; Hoose, Corinna; Hu, M.; Hyvärinen, A.; Hõrrak, U.; Iinuma, Y.; Iversen, Trond; Josipovic, M.; Kanakidou, Maria; Kiendler-Scharr, A.; Kirkevåg, Alf; Kiss, G.; Klimont, Z.; Kolmonen, P.; Komppula, M.; Kristjansson, Jon Egill; Laakso, L.; Laaksonen, A.; Labonnote, L.; Lanz, V. A.; Lehtinen, K. E. J.; Rizzo, L. V.; Makkonen, R.; Manninen, H. E.; McMeeking, G.; Merikanto, J.; Minikin, A.; Mirme, S.; Morgan, W. T.; Nemitz, E.; O'Donnell, D.; Panwar, T. S.; Pawlowska, H.; Petzold, A.; Pienaar, J. J.; Pio, C.; Plass-Duelmer, C.; Prévôt, A. S. H.; Pryor, S.; Reddington, C. L.; Roberts, G.; Rosenfeld, Daniel; Schwarz, J.; Seland, Øyvind; Sellegri, K.; Shen, X. J.; Shiraiwa, M.; Siebert, H.; Sierau, Berko; Simpson, David; Sun, J. Y.; Topping, D.; Tunved, Peter; Vaattovaara, P.; Vakkari, V.; Veefkind, J. P.; Visschedijk, A.; Vuollekoski, H.; Vuolo, R.; Wehner, B.; Wildt, J.; Woodward, S.; Worsnop, D. R.; van Zadelhoff, G.-J.; Zardini, A. A.; Zhang, K.; van Zyl, P. G.; Kerminen, V.-M.; Carslaw, K. S.; Pandis, S. N. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2011)
    In this paper we describe and summarize the main achievements of the European Aerosol Cloud Climate and Air Quality Interactions project (EUCAARI). EUCAARI started on 1 January 2007 and ended on 31 December 2010 leaving a ...
  • Kristjansson, Jon Egill; Muri, Helene; Schmidt, Hauke (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    Recent multimodel studies have shown that if one attempts to cancel increasing CO2 concentrations by reducing absorbed solar radiation, the hydrological cycle will weaken if global temperature is kept unchanged. Using a ...
  • Tilmes, Simone; Fasullo, John; Lamarque, Jean-Francois; Marsh, Daniel R.; Mills, Michael G L; Alterskjær, Kari; Muri, Helene; Kristjansson, Jon Egill; Boucher, Olivier; Schulz, Michael; Cole, Jason N.S.; Curry, Charles L.; Jones, Andy; Haywood, Jim M.; Irvine, Peter J.; Ji, Duoying; Moore, John C.; Karam, Diana Bou; Kravitz, Ben; Rasch, Philip J.; Singh, Baldwinder; Yoon, Yin-ho; Niemeier, Ulrike; Schmidt, Hauke; Robock, Alan; Yang, Shuting; Watanabe, Shingo (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
    [1] The hydrological impact of enhancing Earth's albedo by solar radiation management is investigated using simulations from 12 Earth System models contributing to the Geoengineering Model Intercomparison Project (GeoMIP). ...
  • Boy, Michael; Thomson, Erik S.; Acosta Navarro, Juan-Camilo; Arnalds, Olafur; Batchvarova, Ekaterina; Bäck, Jaana; Berninger, Frank; Bilde, Merete; Brasseur, Zoe; Dagsson-Waldhauserova, Pavla; Castarede, Dimitri; Dalirian, Maryam; de Leeuw, Gerrit; Dragosics, Monika; Duplissy, Ella-Maria; Duplissy, Jonathan; Ekman, Annica; Fang, Keyan; Gallet, Jean-Charles; Glasius, Marianne; Gryning, Sven-Erik; Grythe, Henrik; Hansson, Hans-Christen; Hansson, Margareta; Isaksson, Elisabeth; Iversen, Trond; Jónsdóttir, Ingibjörg Svala; Kasurinen, Ville; Kirkevåg, Alf; Korhola, Atte; Krejci, Radovan; Kristjansson, Jon Egill; Lappalainen, Hanna K.; Lauri, Antti; Leppäranta, Matti; Lihavainen, Heikki; Makkonen, Risto; Massling, Andreas; Meinander, Outi; Nilsson, E. Douglas; Ólafsson, Haraldur; Pettersson, Jan B. C.; Prisle, Nønne L.; Riipinen, Ilona; Roldin, Pontus; Ruppel, Meri; Salter, Matthew E.; Sand, Maria; Seland, Øyvind; Seppä, Heikki; Skov, Henrik; Soares, Joana; Stohl, Andreas; Ström, Johan; Svensson, Jonas; Swietlicki, Erik; Tabakova, Ksenia; Thorsteinsson, Throstur; Virkkula, Aki; Weyhenmeyer, Gesa A.; Wu, Yusheng; Zieger, Paul; Kulmala, Markku (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    The Nordic Centre of Excellence CRAICC (Cryosphere–Atmosphere Interactions in a Changing Arctic Climate), funded by NordForsk in the years 2011–2016, is the largest joint Nordic research and innovation initiative to date, ...
  • Ahlm, Lars; Jones, Andy; Stjern, Camilla Weum; Muri, Helene; Kravitz, Ben; Kristjansson, Jon Egill (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Marine cloud brightening through sea spray injection has been proposed as a climate engineering method for avoiding the most severe consequences of global warming. A limitation of most of the previous modelling studies on ...
  • Kravitz, Ben; MacMartin, Douglas G.; Robock, Alan; Rasch, Philip J.; Ricke, Katharine L.; Cole, Jason N.S.; Curry, Charles L.; Irvine, Peter J.; Ji, Duoying; Keith, David W.; Kristjansson, Jon Egill; Moore, John C.; Muri, Helene Østlie; Singh, Balwinder; Tilmes, Simone; Watanabe, Shingo; Yang, Shuting; Yoon, Jin-Ho (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    Global-scale solar geoengineering is the deliberate modification of the climate system to offset some amount of anthropogenic climate change by reducing the amount of incident solar radiation at the surface. These changes ...
  • Stjern, Camilla Weum; Muri, Helene; Ahlm, Lars; Boucher, Olivier; Cole, Jason N.S.; Ji, Duoying; Jones, Andy; Haywood, Jim M.; Kravitz, Ben; Lenton, Andrew; Moore, John C.; Niemeier, Ulrike; Phipps, Steven J.; Schmidt, Hauke; Watanabe, Shingo; Kristjansson, Jon Egill (Journal article / Tidsskriftartikkel / PublishedVersion, 2017)
    Here we show results from Earth System Model simulations from the marine cloud brightening experiment G4cdnc of the Geoengineering Model Intercomparison Project (GeoMIP). The nine contributing models prescribe a 50 % ...
  • Kravitz, Ben; Forster, Piers M.; Jones, Andy; Robock, Alan; Alterskjaer, Kari; Boucher, Olivier; Jenkins, Annabel K. L.; Korhonen, Hannele; Kristjansson, Jon Egill; Muri, Helene; Niemeier, Ulrike; Partanen, Antti-Ilari; Rasch, Philip J.; Wang, Hailong; Watanabe, Shingo (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
    [1] Marine cloud brightening through sea spray injection has been proposed as a method of temporarily alleviating some of the impacts of anthropogenic climate change, as part of a set of technologies called geoengineering. ...
  • Alterskjær, Kari; Kristjansson, Jon Egill; Boucher, Olivier; Muri, Helene Østlie; Niemeier, Ulrike; Schmidt, Hauke; Schulz, Michael; Timmreck, Claudia (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
    [1] Among proposed mechanisms for counteracting global warming through solar radiation management is the deliberate injection of sea salt acting via marine cloud brightening and the direct effect of sea-salt aerosols. In ...
  • Muri, Helene; Niemeier, Ulrike; Kristjansson, Jon Egill (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    Tropical forests represent a major atmospheric carbon dioxide sink. Here the gross primary productivity (GPP) response of tropical rainforests to climate engineering via marine sky brightening under a future scenario is ...