Exploració per tema "Clima--Observacions"

Ara es mostren els items 1-20 de 34

    • An assessment of regional sea ice predictability in the Arctic ocean 

      Cruz-García, Rubén; Guemas, Virginie; Chevallier, Matthieu; Massonnet, François (Springer, 2019-07)
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      Accés obert
      Arctic sea ice plays a central role in the Earth’s climate. Changes in the sea ice on seasonal-to-interannual timescales impact ecosystems, populations and a growing number of stakeholders. A prerequisite for achieving ...

    • An assessment of ten ocean reanalyses in the polar regions 

      Uotila, Petteri; Goosse, Hugues; Haines, Keith; Chevallier, Matthieu; Barthélemy, Antoine; Bricaud, Clément; Carton, Jim; Fuckar, Neven; Garric, Gilles; Iovino, Doroteaciro; Kauker, Frank; Korhonen, Meri; Lien, Vidar S.; Marnela, Marika; Massonnet, François; Mignac, Davi; Peterson, K. Andrew; Sadikni, Remon; Shi, Li; Tietsche, Steffen; Toyoda, Takahiro; Xie, Jiping; Zhang, Zhaoru (Springer, 2019-02)
      Article
      Accés obert
      Global and regional ocean and sea ice reanalysis products (ORAs) are increasingly used in polar research, but their quality remains to be systematically assessed. To address this, the Polar ORA Intercomparison Project ...

    • Benefits of Increasing the Model Resolution for the Seasonal Forecast Quality in EC-Earth 

      Prodhomme, Chloé; Batté, L.; Massonnet, François; Davini, P.; Bellprat, Omar; Guemas, Virginie; Doblas-Reyes, Francisco (American Meteorological Society, 2016-12-05)
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      Accés obert
      Resolution in climate models is thought to be an important factor for advancing seasonal prediction capability. To test this hypothesis, seasonal ensemble reforecasts are conducted over 1993–2009 with the European community ...

    • Bias adjustment and ensemble recalibration methods for seasonal forecasting: a comprehensive intercomparison using the C3S dataset 

      Manzanas, Rodrigo; Gutiérrez, José Manuel; Bhend, J.; Doblas-Reyes, Francisco; Torralba, Verónica; Penabad, E.; Brookshaw, A. (Springer, 2019-08)
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      Accés obert
      This work presents a comprehensive intercomparison of different alternatives for the calibration of seasonal forecasts, ranging from simple bias adjustment (BA)—e.g. quantile mapping—to more sophisticated ensemble recalibration ...

    • Bias correction and downscaling of future RCM precipitation projections using a MOS-Analog technique 

      Turco, Marco; Llasat, Maria C.; Herrera, Sixto; Gutiérrez, José Manuel (American Geophysical Union (AGU), 2017-03-06)
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      Accés obert
      In this study we assess the suitability of a recently introduced analog-based Model Output Statistics (MOS) downscaling method (referred to as MOS-Analog) for climate change studies and compare the results with a quantile ...

    • Characterization of the near surface wind speed distribution at global scale: ERA-Interim reanalysis and ECMWF seasonal forecasting system 4 

      Marcos, Raül; González-Riviriego, Nube; Torralba, Verónica; Soret, Albert; Doblas-Reyes, Francisco (Springer, 2019-03)
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      Accés obert
      The present developments in 10 m wind seasonal forecast products have lead to a growth in the number of studies analysing different aspects of both its predictability and applicability. However, there is still a lack of ...

    • Climate controls on snow reliability in French Alps ski resorts 

      Spandre, P.; François, H.; Verfaillie, Deborah; Lafaysse, M.; Déqué, M.; Eckert, N.; George, E.; Morin, S. (Nature Research, 2019-05-29)
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      Accés obert
      Ski tourism is a major sector of mountain regions economy, which is under the threat of long-term climate change. Snow management, and in particular grooming and artificial snowmaking, has become a routine component of ski ...

    • Crossing the chasm: how to develop weather and climate models for next generation computers? 

      Lawrence, Bryan N.; Rezny, Mike; Budich, Reinhard; Bauer, Peter; Behrens, Jörg; Carter, Mick; Deconinck, Willem; Ford, Rupert; Maynard, Christopher; Mullerworth, Steven; Osuna, Carlos; Porter, Andrew; Serradell, Kim; Valcke, Sophie; Wedi, Nils; Wilson, Simon (European Geosciences Union, 2018-05-08)
      Article
      Accés obert
      Weather and climate models are complex pieces of software which include many individual components, each of which is evolving under pressure to exploit advances in computing to enhance some combination of a range of possible ...

    • Decadal climate prediction with a refined anomaly initialisation approach 

      Volpi, Danila; Guemas, Virginie; Doblas-Reyes, Francisco; Hawkins, Ed; Nichols, Nancy K. (Springer International Publishing, 2016-06-04)
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      Accés obert
      In decadal prediction, the objective is to exploit both the sources of predictability from the external radiative forcings and from the internal variability to provide the best possible climate information for the next ...

    • Dynamical prediction of Arctic sea ice modes of variability 

      Fuckar, Neven; Guemas, Virginie; Johnson, Nathaniel C.; Doblas-Reyes, Francisco (Springer, 2019-03)
      Article
      Accés obert
      This study explores the prediction skill of the northern hemisphere (NH) sea ice thickness (SIT) modes of variability in a state-of-the-art coupled forecast system with respect to two statistical forecast benchmarks. ...

    • Gas-phase chemistry in the online multiscale NMMB/BSC Chemical Transport Model: Description and evaluation at global scale 

      Badia, Alba; Jorba, Oriol; Voulgarakis, Apostolos; Dabdub, Donald; Pérez, Carlos; Hilboll, Andreas; Gonçalves, María; Janjic, Zavisa (European Geosciences Union (EGU), 2016-06-13)
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      Accés obert
      This paper presents a comprehensive description and benchmark evaluation of the tropospheric gas-phase chemistry component of the NMMB/BSC Chemical Transport Model (NMMB/BSC-CTM), an online chemical weather prediction ...

    • How Skillful are the Multiannual Forecasts of Atlantic Hurricane Activity? 

      Caron, Louis-Philippe; Hermanson, Leon; Dobbin, Alison; Imbers, Jara; Lledó, Llorenç; Vecchi, Gabriel A. (American Meteorological Society, 2018-03)
      Article
      Accés obert
      The recent emergence of near-term climate prediction, wherein climate models are initialized with the contemporaneous state of the Earth system and integrated up to 10 years into the future, has prompted the development ...

    • How to use mixed precision in ocean models: exploring a potential reduction of numerical precision in NEMO 4.0 and ROMS 3.6 

      Tintó-Prims, Oriol; Acosta Cobos, Mario César; Moore, Andrew M.; Castrillo, Miguel; Serradell, Kim; Cortés, Ana; Doblas-Reyes, Francisco (European Geosciences Union (EGU), 2019-07-24)
      Article
      Accés obert
      Mixed-precision approaches can provide substantial speed-ups for both computing- and memory-bound codes with little effort. Most scientific codes have overengineered the numerical precision, leading to a situation in which ...

    • Impact of WRF model PBL schemes on air quality simulations over Catalonia, Spain 

      Banks, Robert F.; Baldasano, Jose M. (Elsevier, 2016-12-01)
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      Accés obert
      Here we analyze the impact of four planetary boundary-layer (PBL) parametrization schemes from the Weather Research and Forecasting (WRF) numerical weather prediction model on simulations of meteorological variables and ...

    • Importance of Late Fall ENSO Teleconnection in the Euro-Atlantic Sector 

      King, Martin P.; Herceg-Bulic, Ivana; Bladé, Ileana; Garcia-Serrano, Javier; Keenlyside, Noel; Kucharski, Fred; Li, Camille; Sobolowski, Stefan (American Meteorological Society, 2018-07-23)
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      Accés obert
      Recent studies have indicated the importance of fall climate forcings and teleconnections in influencing the climate of the northern mid- to high latitudes. Here, we present some exploratory analyses using observational ...

    • Multi-model assessment of linkages between eastern Arctic sea-ice variability and the Euro-Atlantic atmospheric circulation in current climate 

      García-Serrano, Javier; Frankignoul, C.; King, M.P.; Arribas, A.; Gao, Y.; Guemas, Virginie; Matei, D.; Msadek, R.; Park, W.; Sanchez-Gomenez, E. (Springer, 2017-10)
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      Accés obert
      A set of ensemble integrations from the Coupled Model Intercomparison Project phase 5, with historical forcing plus RCP4.5 scenario, are used to explore if state-of-the-art climate models are able to simulate previously ...

    • Multi-model assessment of the impact of soil moisture initialization on mid-latitude summer predictability 

      Ardilouze, Constantin; Batté, L.; Bunzel, F.; Decremer, D.; Déqué, M.; Doblas-Reyes, Francisco; Douville, H.; Fereday, D.; Guemas, Virginie; MacLachlan, C.; Müller, W.; Prodhomme, Chloe (Springer, 2017-12-01)
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      Accés obert
      Land surface initial conditions have been recognized as a potential source of predictability in sub-seasonal to seasonal forecast systems, at least for near-surface air temperature prediction over the mid-latitude continents. ...

    • Multi-scale enhancement of climate prediction over land by increasing the model sensitivity to vegetation variability in EC-Earth 

      Alessandri, Andrea; Catalano, Franco; de Felice, Matteo; van der Hurk, Bart; Doblas-Reyes, Francisco; Boussetta, Souhail; Balsamo, Gianpaolo; Miller, Paul A. (Springer, 2017-08)
      Article
      Accés obert
      The EC-Earth earth system model has been recently developed to include the dynamics of vegetation. In its original formulation, vegetation variability is simply operated by the Leaf Area Index (LAI), which affects climate ...

    • Optimization of atmospheric transport models on HPC platforms 

      de la Cruz, Raúl; Folch, Arnau; Farré, Pau; Cabezas, Javier; Navarro, Nacho; Cela, José M. (Elsevier, 2016-12)
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      Accés obert
      The performance and scalability of atmospheric transport models on high performance computing environments is often far from optimal for multiple reasons including, for example, sequential input and output, synchronous ...

    • Optimizing domain decomposition in an ocean model: the case of NEMO 

      Tintó, Oriol; Acosta, Mario; Castrillo, Miguel; Cortés, Ana; Sanchez, Alicia; Serradell, Kim; Doblas-Reyes, Francisco (Elsevier, 2017)
      Article
      Accés obert
      Earth System Models are critical tools for the study of our climate and its future trends. These models are in constant evolution and their growing complexity entails an incrementing demand of the resources they require. ...