Blar i Bergen Open Research Archive på tidsskrift "Geophysical Research Letters"

Viser treff 61-80 av 95

    • Northward shifts in the polar front preceded Bølling and Holocene warming in southwestern Scandinavia 

      Cowling, Owen C.; Thomas, Elizabeth K.; Svendsen, John-Inge; Mangerud, Jan; Vasskog, Kristian; Haflidason, Haflidi (Journal article; Peer reviewed, 2020)
      The last deglaciation in northern Europe provides an opportunity to study the hydrologic component of abrupt climate shifts in a region with complex interactions between ice sheets and oceanic and atmospheric circulation. ...

    • Observational evidence for throat aurora being associated with magnetopause reconnection 

      Han, De-Sheng; Xu, Tong; Jin, Yaqi; Oksavik, Kjellmar; Chen, Xiangcai; Liu, Jian-Jun; Zhang, Qinghe; Baddeley, Lisa; Herlingshaw, Katie (Peer reviewed; Journal article, 2019)
      Throat auroras have been suggested to be related to indentations on the subsolar magnetopause. However, the indentation generation process and the resulting ionospheric responses have remained unknown. An EISCAT Svalbard ...

    • Observational Evidence of Magnetic Reconnection in the Terrestrial Bow Shock Transition Region 

      Wang, Shan; Chen, Li-Jen; Bessho, Naoki; Hesse, Michael; Wilson, Lynn B.; Giles, Barbara; Moore, Thomas E.; Russell, Christopher T.; Torbert, Roy B.; Burch, James L. (Journal article; Peer reviewed, 2019)
      We report evidence of magnetic reconnection in the transition region of the Earth's bow shock when the angle between the shock normal and the immediate upstream magnetic field is 65°. An ion‐skin‐depth‐scale current sheet ...

    • Observations of Blue Corona Discharges in Thunderclouds 

      Husbjerg, Lasse Skaaning; Neubert, Torsten; Chanrion, Olivier; Dimitriadou, Krystallia; Li, Dongshuai; Stendel, Martin; Kaas, Eigil; Østgaard, Nikolai; Reglero, Victor (Journal article; Peer reviewed, 2022)
      Blue electric streamer discharges in the upper reaches of thunderclouds are observed as flashes of 337.0 nm (blue) with faint or no emissions of 777.4 nm (red). Analyzing 3 years of measurements by the Atmosphere-Space ...

    • Ocean release of fossil fuel CO2: A case study 

      Drange, Helge; Alendal, Guttorm; Johannessen, Ola M. (Journal article; Peer reviewed, 2001-07-01)
      The natural ocean uptake of the greenhouse gas CO2 can be accelerated by collecting and liquefying the gas from point sources, and by pumping it into the ocean at appropriate locations and at sufficient depths. Results ...

    • On effect of wave breaking on short wind waves 

      Kudryavtsev, Vladimir; Johannessen, Johnny A. (Peer reviewed; Journal article, 2004-10)
      The paper presents an attempt to estimate short wave generation by wave breaking. A breaking wave crest disturbs the surface and generates sub-surface turbulence. The locally disturbed area further disperses and feeds short ...

    • On the Impact of a Streaming Oxygen Population on Collisionless Magnetic Reconnection 

      Kolstø, Håkon Midthun; Hesse, Michael; Norgren, Astrid Elisabet Cecilia; Tenfjord, Paul; Spinnangr, Susanne Flø; Kwagala, Norah Kaggwa (Journal article; Peer reviewed, 2020)
      Using 2.5-D Particle-In-Cell (PIC) simulations, we investigate how magnetotail reconnection is affected by a cold, streaming, oxygen plasma population, attributed to an ionospheric source, in the inflow region. As the ...

    • Overview of the Rocket Experiment for NeutralUpwelling Sounding Rocket 2 (RENU2) 

      Lessard, Marc R.; Fritz, Bruce; Sadler, Brent; Cohen, Ian J.; Kenward, David; Godbole, Niharika; Clemmons, James H.; Hecht, James H.; Lynch, Kristina A.; Harrington, Meghan; Roberts, Thomas M.; Hysell, David; Crowley, Geoff; Sigernes, Fred; Syrjäsuo, Mikko; Ellingsen, Pål Gunnar; Partamies, Noora; Moen, Jøran Idar; Clausen, Lasse Boy Novock; Oksavik, Kjellmar; Yeoman, Timothy (Journal article; Peer reviewed, 2020)
      The Rocket Experiment for Neutral Upwelling 2 (RENU2) rocket was launched on 13 December 2015 at 07:34 UT. The payload transited the cusp region during a neutral upwelling event, supported by a comprehensive set of onboard ...

    • Possible Ionospheric Influence on Substorm Onset Location 

      Elhawary, Reham Zakaria Ahmed Mohamed; Laundal, Karl Magnus; Reistad, Jone Peter; Hatch, Spencer Mark (Journal article; Peer reviewed, 2022)
      Auroral substorm onset locations are highly unpredictable. Previous studies have shown that the By component of the interplanetary magnetic field (IMF) explains ∼5% of the variation in onset magnetic local time (MLT), while ...

    • Postinjection Normal Closure of Fractures as a Mechanism for Induced Seismicity 

      Ucar, Eren; Berre, Inga; Keilegavlen, Eirik (Peer reviewed; Journal article, 2017-10-04)
      Understanding the controlling mechanisms underlying injection-induced seismicity is important for optimizing reservoir productivity and addressing seismicity-related concerns related to hydraulic stimulation in Enhanced ...

    • Predictable Variations of the Carbon Sinks and Atmospheric CO2 Growth in a Multi-Model Framework 

      Ilyina, Tatiana; Hongmei, Li; Spring, Aaron; Müller, Wolfgang A.; Bopp, Laurent; Chikamoto, Megumi O.; Danabasoglu, Gokhan; Dobrynin, Mikhail; Dunne, John P. Patrick; Fransner, Filippa; Friedlingstein, Pierre; Lee, Woo-Sung; Lovenduski, Nicole; Merryfield, William J.; Mignot, Juliette; Park, Jong-Yeon; Séférian, Roland; Sospedra-Alfonso, Reinel; Watanabe, Michio; Yeager, Stephen G. (Journal article; Peer reviewed, 2021)
      Inter-annual to decadal variability in the strength of the land and ocean carbon sinks impede accurate predictions of year-to-year atmospheric carbon dioxide (CO2) growth rate. Such information is crucial to verify the ...

    • The Quasi-Linear Absolute Angular Momentum Slope of Tropical Cyclones Under Rapid Intensification 

      Tao, Dandan; Nystrom, Robert; Bell, Michael (Journal article; Peer reviewed, 2023)
      Tropical cyclone (TC) low-level tangential wind structure is known to be an important input for risk assessment (e.g., storm surge). However, a realistic TC wind structure model with easy implementation is still needed for ...

    • Recent and future changes of the Arctic sea-ice cover 

      Smedsrud, Lars Henrik; Sorteberg, Asgeir; Kloster, Kjell (Peer reviewed; Journal article, 2008)
      The present and future state of the Arctic sea ice cover is explored using new observations and a coupled one dimensional air–sea–ice model. Updated satellite observations of Fram Strait ice-area export show an increase ...

    • Reversals in Temperature-Precipitation Correlations in the Northern Hemisphere Extratropics During the Holocene 

      Herzschuh, Ulrike; Böhmer, Thomas; Li, Chenzhi; Cao, Xianyong; Hébert, Raphaël; Dallmeyer, Anne; Telford, Richard James; Kruse, Stefan (Journal article; Peer reviewed, 2022)
      Future precipitation levels remain uncertain because climate models have struggled to reproduce observed variations in temperature-precipitation correlations. Our analyses of Holocene proxy-based temperature-precipitation ...

    • The Role of Mid-latitude Westerly Jet in the Impacts of November Ural Blocking on Early-Winter Warmer Arctic-Colder Eurasia Pattern 

      Xu, Xinping; He, Shengping; Zhou, Botao; Wang, Huijun; Outten, Stephen (Journal article; Peer reviewed, 2022)
      Based on statistical analysis using observations and idealized model simulations, previous studies have revealed the potential response of early-winter atmospheric circulation and temperature anomalies to November Ural ...

    • Satellite detection of natural films on the ocean surface 

      Espedal, Heidi A.; Johannessen, Ola M.; Knulst, Johan (Journal article; Peer reviewed, 1996-11-01)
      Natural films on the ocean surface influence air-sea fluxes of momentum, heat, and gas. It is therefore essential to be able to map the geographical extent and variability of such films to determine the resulting impact ...

    • Sea ice velocity in the Fram Strait monitored by moored instruments 

      Widell, K.; Østerhus, Svein; Gammelsrød, Tor (Peer reviewed; Journal article, 2003-10-04)
      The Fram Strait sea ice velocity was measured by means of a new method using moored Doppler Current Meters in the period 1996–2000. Almost 3 years of ice velocity observations near 79N 5W are analyzed. The average southward ...

    • The Seasonal and Regional Transition to an Ice-Free Arctic 

      Årthun, Marius; Onarheim, Ingrid H.; Dörr, Jakob; Eldevik, Tor (Journal article; Peer reviewed, 2021)
      The Arctic sea ice cover is currently retreating and will continue its retreat in a warming world. However, the loss of sea ice is neither regionally nor seasonally uniform. Here, we present the first regional and seasonal ...

    • Seasonal Outflow of Ice Shelf Water Across the Front of the Filchner Ice Shelf, Weddell Sea, Antarctica 

      Darelius, Elin Maria K.; Sallee, Jean-Bapiste (Peer reviewed; Journal article, 2018-04)
      The ice shelf water (ISW) found in the Filchner Trough, located in the southern Weddell Sea, Antarctica, is climatically important; it descends into the deep Weddell Sea contributing to bottom water formation, and it blocks ...

    • Snow-Atmosphere Humidity Exchange at the Ice Sheet Surface Alters Annual Mean Climate Signals in Ice Core Records 

      Dietrich, Laura Jasmin; Steen-Larsen, Hans Christian; Wahl, Sonja; Jones, Tyler R.; Town, Michel Stephen; Werner, Martin (Journal article; Peer reviewed, 2023)
      Surface processes alter the water stable isotope signal of the surface snow after deposition. However, it remains an open question to which extent surface post-depositional processes should be considered when inferring ...