Browsing Bergen Open Research Archive by Author "Spengler, Thomas"

Now showing items 21-31 of 31

    • The North Atlantic waveguide and downstream impact experiment 

      Schäfler, Andreas; Craig, George; Wernli, Heini; Arbogast, Philippe; Doyle, James D.; McTaggart-Cowan, Ron; Methven, John; Rivière, Gwendal; Ament, Felix; Boettcher, Maxi; Bramberger, Martina; Cazenave, Quitterie; Cotton, Richard; Crewell, Susannne; Delanoë, Julien; Dörnbrack, Andreas; Ehrlich, André; Ewald, Florian; Fix, Andreas; Grams, Christian M.; Gray, Suzanne L.; Grob, Johannes; Groß, Silke; Hagen, Martin; Harvey, Ben; Hirsch, Lutz; Jacob, Marek; Kölling, Tobias; Konow, Heike; Lemmerz, Christian; Lux, Oliver; Magnusson, Linus; Mayer, Bernhard; Mech, Mario; Moore, Richard; Pelon, Jacques; Quinting, Julian; Rahm, Stephan; Rapp, Markus; Rautenhaus, Marc; Reitebuch, Oliver; Reynolds, Carlolyn A.; Sodemann, Harald; Spengler, Thomas; Vaughan, Geraint; Wendisch, Manfred; Wirth, Martin; Witschas, Benjamin; Wolf, Kevin; Zinner, Tobias (Peer reviewed; Journal article, 2018)
      The North Atlantic Waveguide and Downstream Impact Experiment (NAWDEX) explored the impact of diabatic processes on disturbances of the jet stream and their influence on downstream high-impact weather through the deployment ...

    • Observing atmospheric convection with dual-scanning lidars 

      Duscha, Christiane Anabell; Palenik, Juraj; Spengler, Thomas; Reuder, Heinrich Joachim (Journal article; Peer reviewed, 2023)
      While convection is a key process in the development of the atmospheric boundary layer, conventional meteorological measurement approaches fall short in capturing the evolution of the complex dynamics of convection. To ...

    • On the Influence of Sea Surface Temperature distributions on the Development of Extratropical Cyclones 

      Bui, Hai Hoang; Spengler, Thomas (Journal article; Peer reviewed, 2021)
      The sea surface temperature (SST) distribution can modulate the development of extratropical cyclones through sensible and latent heat fluxes. However, the direct and indirect effects of these surface fluxes, and thus the ...

    • Polar low workshop 

      Heinemann, Günther; Claud, Chantal; Spengler, Thomas (Journal article, 2019)

    • Polar lows – moist-baroclinic cyclones developing in four different vertical wind shear environments 

      Stoll, Patrick; Spengler, Thomas; Terpstra, Annick; Graversen, Rune (Journal article; Peer reviewed, 2021)
      Polar lows are intense mesoscale cyclones that develop in polar marine air masses. Motivated by the large variety of their proposed intensification mechanisms, cloud structure, and ambient sub-synoptic environment, we use ...

    • Prevailing Surface Wind Direction during Air-Sea Heat Exchange 

      Ogawa, Fumiaki; Spengler, Thomas (Peer reviewed; Journal article, 2019)
      While the climatological-mean sensible and latent heat fluxes are remarkably well described using climatological-mean fields in the bulk flux formulas, this study shows that a significant fraction of the climatological-mean ...

    • Reconciling conflicting evidence for the cause of the observed early 21st century Eurasian cooling 

      Outten, Stephen; Li, Camille; King, Martin Peter; Suo, Lingling; Siew, Yu Feng; Cheung, Hoffman; Davy, Richard; Dunn-Sigouin, Etienne; Furevik, Tore; He, Shengping; Madonna, Erica; Sobolowski, Stefan Pieter; Spengler, Thomas; Woollings, Tim (Journal article; Peer reviewed, 2023)
      It is now well established that the Arctic is warming at a faster rate than the global average. This warming, which has been accompanied by a dramatic decline in sea ice, has been linked to cooling over the Eurasian ...

    • Relative importance of tropopause structure and diabatic heating for baroclinic instability 

      Haualand, Kristine Flacké; Spengler, Thomas (Journal article; Peer reviewed, 2021)
      Misrepresentations of wind shear and stratification around the tropopause in numerical weather prediction models can lead to errors in potential vorticity gradients with repercussions for Rossby wave propagation and ...

    • Sensitivity of Air-Sea Heat Exchange in Cold-Air Outbreaks to Model Resolution and Sea-Ice Distribution 

      Spensberger, Clemens; Spengler, Thomas (Journal article; Peer reviewed, 2021)
      Modeling air-sea interactions during cold air outbreaks poses a major challenge because of the vast range of scales and physical processes involved. Using the Polar WRF model, we investigate the sensitivity of downstream ...

    • Testing a Flexible Method to Reduce False Monsoon Onsets 

      Reeve, Mathew Alexander; Spengler, Thomas; Chu, Pao-Shin (Peer reviewed; Journal article, 2014-08-08)
      To generate information about the monsoon onset and withdrawal we have to choose a monsoon definition and apply it to data. One problem that arises is that false monsoon onsets can hamper our analysis, which is often ...

    • Warm air intrusions reaching the MOSAiC expedition in April 2020- The YOPP targeted observing period (TOP) 

      Svensson, Gunilla; Murto, Sonja; Shupe, Matthew D.; Pithan, Felix; Magnusson, Linus; Day, Jonathan J.; Doyle, James D.; Renfrew, Ian A.; Spengler, Thomas; Vihma, Timo (Journal article; Peer reviewed, 2023)
      In the spring period of the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition, an initiative was in place to increase the radiosounding frequency during warm air intrusions in the ...