Blar i Faculty of Mathematics and Natural Sciences på forfatter "Bethke, Ingo"

Viser treff 1-20 av 24

    • Arctic amplification under global warming of 1.5 and 2 °C in NorESM1-Happi 

      Graff, Lise Seland; Iversen, Trond; Bethke, Ingo; Debernard, Jens Boldingh; Seland, Øyvind; Bentsen, Mats; Kirkevåg, Alf; Li, Camille; Oliviè, Dirk Jan Leo (Peer reviewed; Journal article, 2019)
      Differences between a 1.5 and 2.0 ∘C warmer climate than 1850 pre-industrial conditions are investigated using a suite of uncoupled (Atmospheric Model Intercomparison Project; AMIP), fully coupled, and slab-ocean experiments ...

    • Attribution of multi-annual to decadal changes in the climate system: The Large Ensemble Single Forcing Model Intercomparison Project (LESFMIP) 

      Smith, Doug M.; Gillett, Nathan P.; Simpson, Isla R.; Athanasiadis, Panos J.; Baehr, Johanna; Bethke, Ingo; Bilge, Tarkan Aslan; Bonnet, Rémy; Boucher, Olivier; Findell, Kirsten L.; Gastineau, Guillaume; Gualdi, Silvio; Hermanson, Leon; Leung, L. Ruby; Mignot, Juliette; Müller, Wolfgang A.; Osprey, Scott; Otterå, Odd Helge; Persad, Geeta G.; Scaife, Adam A.; Schmidt, Gavin A.; Shiogama, Hideo; Sutton, Rowan T.; Swingedouw, Didier; Yang, Shuting; Zhou, Tianjun; Ziehn, Tilo (Journal article; Peer reviewed, 2022)
      Multi-annual to decadal changes in climate are accompanied by changes in extreme events that cause major impacts on society and severe challenges for adaptation. Early warnings of such changes are now potentially possible ...

    • Can we use ice sheet reconstructions to constrain meltwater for deglacial simulations? 

      Bethke, Ingo; Li, Camille; Nisancioglu, Kerim Hestnes (Peer reviewed; Journal article, 2012)
      Freshwater pulses from melting ice sheets are thought to be important for driving deglacial climate variability. This study investigates challenges in simulating and understanding deglacial climate evolution within this ...

    • Causes of the large warm bias in the Angola–Benguela Frontal Zone in the Norwegian Earth System Model 

      Koseki, Shunya; Keenlyside, Noel; Demissie, Teferi Dejene; Toniazzo, Thomas; Counillon, Francois; Bethke, Ingo; Ilicak, Mehmet; Shen, Mao-Lin (Journal article; Peer reviewed, 2018)
      We have investigated the causes of the sea surface temperature (SST) bias in the Angola–Benguela Frontal Zone (ABFZ) of the southeastern Atlantic Ocean simulated by the Norwegian Earth System Model (NorESM). Similar to ...

    • Equilibrium simulations of Marine Isotope Stage 3 climate 

      Guo, Chuncheng; Nisancioglu, Kerim Hestnes; Bentsen, Mats; Bethke, Ingo; Zhang, Zhongshi (Peer reviewed; Journal article, 2019-06-26)
      An equilibrium simulation of Marine Isotope Stage 3 (MIS3) climate with boundary conditions characteristic of Greenland Interstadial 8 (GI-8; 38 kyr BP) is carried out with the Norwegian Earth System Model (NorESM). A ...

    • Evaluating the biological pump efficiency of the Last Glacial Maximum ocean using δ13C 

      Morée, Anne; Schwinger, Jörg; Ninnemann, Ulysses S; Jeltsch-Thommes, Aurich; Bethke, Ingo; Heinze, Christoph (Journal article; Peer reviewed, 2021)
      Although both physical and biological marine changes are required to explain the 100 ppm lower atmospheric pCO2 of the Last Glacial Maximum (LGM, ∼21 ka) as compared to preindustrial (PI) times, their exact contributions ...

    • Impact of initialization methods on the predictive skill in NorCPM: an Arctic–Atlantic case study 

      Passos, Leilane G.; Langehaug, Helene R.; Årthun, Marius; Eldevik, Tor; Bethke, Ingo; Kimmritz, Madlen (Journal article; Peer reviewed, 2022)
      The skilful prediction of climatic conditions on a forecast horizon of months to decades into the future remains a main scientific challenge of large societal benefit. Here we assess the hindcast skill of the Norwegian ...

    • Impact of ocean and sea ice initialisation on seasonal prediction skill in the Arctic 

      Kimmritz, Madlen; Counillon, Francois; Smedsrud, Lars H.; Bethke, Ingo; Keenlyside, Noel; Ogawa, Fumiaki; Wang, Yiguo (Peer reviewed; Journal article, 2019)
      There is a growing demand for skillful prediction systems in the Arctic. Using the Norwegian Climate Prediction Model (NorCPM) that combines the fully-coupled Norwegian Earth System Model and the Ensemble Kalman filter, ...

    • Initialization shock in the ocean circulation reduces skill in decadal predictions of the North Atlantic subpolar gyre 

      Polkova, Iuliia; Swingedouw, Didier; Hermanson, Leon; Köhl, Armin; Stammer, Detlef; Smith, Doug; Kröger, Jürgen; Bethke, Ingo; Yang, Xiaosong; Zhang, Liping; Nicolì, Dario; Athanasiadis, Panos J.; Karami, Mehdi Pasha; Pankatz, Klaus; Pohlmann, Holger; Wu, Bo; Bilbao, Roberto; Ortega, Pablo; Yang, Shuting; Sospedra-Alfonso, Reinel; Merryfield, William; Kataoka, Takahito; Tatebe, Hiroaki; Imada, Yukiko; Ishii, Masayoshi; Matear, Richard J. (Journal article; Peer reviewed, 2023)
      Due to large northward heat transport, the Atlantic meridional overturning circulation (AMOC) strongly affects the climate of various regions. Its internal variability has been shown to be predictable decades ahead within ...

    • NorCPM1 and its contribution to CMIP6 DCPP 

      Bethke, Ingo; Wang, Yiguo; Counillon, Francois Stephane; Keenlyside, Noel Sebastian; Kimmritz, Madlen; Fransner, Filippa; Samuelsen, Annette; Langehaug, Helene R.; Svendsen, Lea; Chiu, Ping-Gin; Passos, Leilane G.; Bentsen, Mats; Guo, Chuncheng; Gupta, Alok Kumar; Tjiputra, Jerry; Kirkevåg, Alf; Oliviè, Dirk Jan Leo; Seland, Øyvind; Vågane, Julie Solsvik; Fan, Yuanchao; Eldevik, Tor (Journal article; Peer reviewed, 2021)
      The Norwegian Climate Prediction Model version 1 (NorCPM1) is a new research tool for performing climate reanalyses and seasonal-to-decadal climate predictions. It combines the Norwegian Earth System Model version 1 (NorESM1) ...

    • Ocean Biogeochemical Predictions—Initialization and Limits of Predictability 

      Fransner, Filippa; Counillon, Francois; Bethke, Ingo; Tjiputra, Jerry; Samuelsen, Annette; Nummelin, Aleksi; Olsen, Are (Journal article; Peer reviewed, 2020)
      Predictions of ocean biogeochemistry, such as primary productivity and CO2 uptake, would help to understand the changing marine environment and the global climate. There is an emerging number of studies where initialization ...

    • Ocean biogeochemistry in the Norwegian Earth System Model version 2 (NorESM2) 

      Tjiputra, Jerry; Schwinger, Jörg; Bentsen, Mats; Morée, Anne; Gao, Shuang; Bethke, Ingo; Heinze, Christoph; Goris, Nadine; Gupta, Alok Kumar; He, Yan-Chun; Oliviè, Dirk Jan Leo; Seland, Øyvind; Schulz, Michael (Journal article; Peer reviewed, 2020)
      The ocean carbon cycle is a key player in the climate system through its role in regulating the atmospheric carbon dioxide concentration and other processes that alter the Earth's radiative balance. In the second version ...

    • On the recent time history and forcing of the inflow of Atlantic Water to the Arctic Mediterranean 

      Nilsen, Jan Even Øie; Hátún, Hjalmar; Sandø, Anne Britt; Bethke, Ingo; Laurantin, Olivier; Gao, Yongqi; Drange, Helge; Furevik, Tore (Extended Abstract for The ACIA International Scientific Symposium on Climate Change in the Arctic, Conference lecture, 2004)

    • Overview of the Norwegian Earth System Model (NorESM2) and key climate response of CMIP6 DECK, historical, and scenario simulations 

      Seland, Øyvind; Bentsen, Mats; Oliviè, Dirk Jan Leo; Toniazzo, Thomas; Gjermundsen, Ada; Graff, Lise Seland; Debernard, Jens Boldingh; Gupta, Alok Kumar; He, Yan-Chun; Kirkevåg, Alf; Schwinger, Jörg; Tjiputra, Jerry; Aas, Kjetil Schanke; Bethke, Ingo; Fan, Yuanchao; Griesfeller, Jan; Grini, Alf; Guo, Chuncheng; Ilicak, Mehmet; Karset, Inger Helene H.; Landgren, Oskar Andreas; Liakka, Johan; Moseid, Kine Onsum; Nummelin, Aleksi; Spensberger, Clemens; Tang, Hui; Zhang, Zhongshi; Heinze, Christoph; Iversen, Trond; Schulz, Michael (Journal article; Peer reviewed, 2020-12)
      The second version of the coupled Norwegian Earth System Model (NorESM2) is presented and evaluated. NorESM2 is based on the second version of the Community Earth System Model (CESM2) and shares with CESM2 the computer ...

    • Pacific contribution to decadal surface temperature trends in the Arctic during the twentieth century 

      Svendsen, Lea; Keenlyside, Noel; Muilwijk, Morven; Bethke, Ingo; Omrani, Nour-Eddine; Gao, Yongqi (Journal article; Peer reviewed, 2021)
      Instrumental records suggest multidecadal variability in Arctic surface temperature throughout the twentieth century. This variability is caused by a combination of external forcing and internal variability, but their ...

    • Pacific contribution to the early twentieth-century warming in the Arctic 

      Svendsen, Lea; Keenlyside, Noel; Bethke, Ingo; Gao, Yongqi; Omrani, Nour-Eddine (Journal article; Peer reviewed, 2018)
      Arctic surface temperature warmed more than twice as fast as global temperature during the early twentieth century, similar to that during the recent global warming. This Arctic warming has been attributed to both external ...

    • Potential Influences of Volcanic Eruptions on Future Global Land Monsoon Precipitation Changes 

      Man, Wenmin; Zuo, Meng; Zhou, Tianjun; Fasullo, John; Bethke, Ingo; Chen, Xiaolong; Zou, Liwei; Wu, Bo (Journal article; Peer reviewed, 2021)
      The global monsoon system is of exceptional socioeconomic importance owing to its impacts on two-thirds of the globe’s population. Major volcanic eruptions strongly influence global land monsoon (GLM) precipitation change. ...

    • Propagation of Thermohaline Anomalies and their predictive potential along the Atlantic water pathway 

      Langehaug, Helene R.; Ortega, Pablo; Counillon, Francois Stephane; Matei, Daniela; Maroon, Elizabeth A.; Keenlyside, Noel Sebastian; Mignot, Juliette; Wang, Yiguo; Swingedouw, Didier; Bethke, Ingo; Yang, Shuting; Danabasoglu, Gokhan; Bellucci, Alessio; Ruggieri, Paolo; Nicoli, D.; Årthun, Marius (Journal article; Peer reviewed, 2022)
      We assess to what extent seven state-of-the-art dynamical prediction systems can retrospectively predict winter sea surface temperature (SST) in the subpolar North Atlantic and the Nordic seas in the period 1970–2005. We ...

    • Relating model bias and prediction skill in the equatorial Atlantic 

      Counillon, Francois; Keenlyside, Noel; Toniazzo, Thomas; Koseki, Shunya; Demissie, Teferi Dejene; Bethke, Ingo; Wang, Yiguo (Journal article; Peer reviewed, 2021)
      We investigate the impact of large climatological biases in the tropical Atlantic on reanalysis and seasonal prediction performance using the Norwegian Climate Prediction Model (NorCPM) in a standard and an anomaly coupled ...

    • Riverine impact on future projections of marine primary production and carbon uptake 

      Gao, Shuang; Schwinger, Jörg; Tjiputra, Jerry; Bethke, Ingo; Hartmann, Jens; Mayorga, Emilio; Heinze, Christoph (Journal article; Peer reviewed, 2023)
      Riverine transport of nutrients and carbon from inland waters to the coastal and finally the open ocean alters marine primary production (PP) and carbon (C) uptake regionally and globally. So far, this process has not been ...