Browsing Geophysical Institute by Title

Now showing items 328-347 of 903

    • Ice and brine production in Hornsund 

      Arntsen, Martin (Master thesis, 2015-06-02)
      The Hornsund fjord system has been studied using observations of the atmosphere, ocean and sea ice, and two different types of models. The study documents significant year to year variability in sea ice formation and brine ...

    • The ice front as a topographic barrier for ocean heat transport 

      Steiger, Nadine (Doctoral thesis, 2021-06-28)
      Antarctic ice shelves are the link between the Southern Ocean and the Antarctic Ice Sheet. The floating ice shelves restrain the seaward flow of the grounded ice, which is balanced by iceberg calving and ocean-induced basal ...

    • Ice shelf water overflow and bottom water formation in the southern Weddell Sea 

      Foldvik, Arne; Gammelsrød, Tor; Østerhus, Svein; Fahrbach, E.; Rohardt, G.; Schröder, Michael; Nicholls, Keith W.; Padman, L.; Woodgate, R. A. (Peer reviewed; Journal article, 2004-02-17)
      Cold shelf waters flowing out of the Filchner Depression in the southern Weddell Sea make a significant contribution to the production of Weddell Sea Bottom Water (WSBW), a precursor to Antarctic Bottom Water (AABW). We ...

    • The Iceland Greenland seas project 

      Renfrew, Ian Alasdair; Pickart, RS; Våge, Kjetil; Moore, GWK; Bracegirdle, TJ; Elvidge, AD; Jeansson, Emil; Lachlan-Cope, T; McRaven, LT; Papritz, L; Reuder, Joachim; Sodemann, Harald; Terpstra, Annick; Waterman, S; Valdimarsson, H; Weiss, A; Almansi, M; Bahr, F; Brakstad, Ailin; Barrell, C; Brooke, JK; Brooks, BJ; Brooks, IM; Brooks, ME; Bruvik, Erik Magnus; Duscha, Christiane; Fer, Ilker; Golid, Heidi M.; Hallerstig, Matilda; Hessevik, Idar; Huang, J; Houghton, L; Jonsson, S; Jonassen, Marius Opsanger; Jackson, Kristin; Kvalsund, Karsten; Kolstad, Erik Wilhelm; Konstali, Kjersti; Kristiansen, Jørn; Ladkin, R; Lin, P; MacRander, A; Mitchell, A; Olafsson, H; Pacini, A; Payne, C; Palmason, B; Perez-Hernandez, MD; Peterson, Algot Kristoffer; Petersen, GN; Pisareva, MN; Pope, JO; Seidl, Andrew; Semper, Stefanie; Sergeev, D; Skjelsvik, Silje; Søiland, Henrik; Smith, D; Spall, MA; Spengler, Thomas; Touzeau, Alexandra; Tupper, G; Weng, Yongbiao; Williams, KD; Yang, X; Zhou, Shenjie (Peer reviewed; Journal article, 2019)
      The Iceland Greenland Seas Project (IGP) is a coordinated atmosphere–ocean research program investigating climate processes in the source region of the densest waters of the Atlantic meridional overturning circulation. ...

    • The Iceland-Faroe Slope Jet: a conduit for dense water toward the Faroe Bank Channel overflow 

      Semper, Stefanie; Pickart, Robert S.; Våge, Kjetil; Larsen, Karin Margretha H.; Hátún, Hjálmar; Hansen, Bogi (Journal article; Peer reviewed, 2020)
      Dense water from the Nordic Seas passes through the Faroe Bank Channel and supplies the lower limb of the Atlantic Meridional Overturning Circulation, a critical component of the climate system. Yet, the upstream pathways ...

    • The Iceland–Faroe inflow of Atlantic water to the Nordic Seas 

      Hansen, Bogi; Østerhus, Svein; Hátún, Hjalmar; Kristiansen, Regin; Larsen, Karin Margretha Húsgarð (Peer reviewed; Journal article, 2003-12)
      The flow of Atlantic water between Iceland and the Faroe Islands is one of three current branches flowing from the Atlantic Ocean into the Nordic Seas across the Greenland–Scotland Ridge. By the heat that it carries along, ...

    • Impact of Arctic sea ice variations on winter temperature anomalies in northern hemispheric land areas 

      Köenigk, Torben; Gao, Yongqi; Gastineau, Guillaume; Keenlyside, Noel; Nakamura, Tetsu; Ogawa, Fumiaki; Orsolini, Yvan; Semenov, Vladimir A.; Suo, Lingling; Tian, Tian; Wang, Tao; Wettstein, Justin; Yang, Shuting (Peer reviewed; Journal article, 2018-07-30)
      Coordinated numerical ensemble experiments with six different state-of-the-art atmosphere models have been used in order to evaluate the respective impact of the observed Arctic sea ice and sea surface temperature (SST) ...

    • The impact of assimilating data from a remotely piloted aircraft on simulations of weak-wind orographic flow 

      Ágústsson, Hálfdán; Ólafsson, Haraldur; Jonassen, Marius Opsanger; Rögnvaldsson, Ólafur (Journal article; Peer reviewed, 2014)
      Orographic winds near a 914 m high mountain in Southwest-Iceland are explored using unique observations made aloft with a small remotely piloted aircraft, as well as with traditional observations and high-resolution ...

    • Impact of Assimilation of Radiosonde and UAV Observations from the Southern Ocean in the Polar WRF Model 

      Sun, Qizhen; Vihma, Timo; Jonassen, Marius Opsanger; Zhang, Zhanhai (Journal article; Peer reviewed, 2020)
      Weather forecasting in the Southern Ocean and Antarctica is a challenge above all due to the rarity of observations to be assimilated in numerical weather prediction (NWP) models. As observations are expensive and logistically ...

    • Impact of data assimilation on Eulerian versus Lagrangian estimates of upper ocean transport 

      Sperrevik, Ann Kristin; Röhrs, Johannes; Christensen, Kai Håkon (Peer reviewed; Journal article, 2017)
      Using four-dimensional variational analysis, we produce an estimate of the state of a coastal region in Northern Norway during the late winter and spring in 1984. We use satellite sea surface temperature and in situ ...

    • Impact of late spring Siberian snow on summer rainfall in South-Central China 

      Shen, Haibo; Li, Fei; He, Shengping; Orsolini, Yvan; Li, Jingyi (Journal article; Peer reviewed, 2020)
      Located in the Yangtze River Valley and surrounded by mountains, South-Central China (SCC) frequently suffered from natural disasters such as torrential precipitation, landslide and debris flow. Here we provide corroborative ...

    • The impact of mean state errors on equatorial Atlantic interannual variability in a climate model 

      Ding, Hui; Keenlyside, Noel; Latif, Mojib; Park, Wonsun; Wahl, Sebastian (Peer reviewed; Journal article, 2015-02-23)
      Observations show that the Equatorial Atlantic Zonal Mode (ZM) obeys similar physics to the El Niño Southern Oscillation (ENSO): positive Bjerknes and delayed negative feedbacks. This implies the ZM may be predictable on ...

    • 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, ...

    • Impact of Snow Initialization in Subseasonal‐to‐Seasonal Winter Forecasts With the Norwegian Climate Prediction Model 

      Li, Fei; Orsolini, Yvan; Keenlyside, Noel; Shen, Mao-Lin; Counillon, Francois; Wang, Yiguo (Peer reviewed; Journal article, 2019)
      Snow initialization has been previously investigated as a potential source of predictability atthe subseasonal‐to‐seasonal (S2S) timescale in winter and spring, through its local radiative,thermodynamical, and hydrological ...

    • Impact of springtime Himalayan-Tibetan Plateau snowpack on the onset of the Indian summer monsoon in coupled seasonal forecasts 

      Senan, Retish; Orsolini, Yvan; Weisheimer, Antje; Vitart, Frédéric; Balsamo, Gianpaolo; Dutra, E.; Doblas-Reyes, Franscisco J.; Basang, Droma (Peer reviewed; Journal article, 2016-02-20)
      The springtime snowpack over the Himalayan–Tibetan Plateau (HTP) region and Eurasia has long been suggested to be an influential factor on the onset of the Indian summer monsoon. To assess the impact of realistic initialization ...

    • The impact of the wind stress curl in the North Atlantic on the Atlantic inflow to the Norwegian Sea toward the Arctic 

      Orvik, Kjell Arild; Skagseth, Øystein (Peer reviewed; Journal article, 2003-09-04)
      The Norwegian Atlantic Current (NwAC) through the Norwegian Sea serves as a conduit of warm and saline Atlantic water from the North Atlantic to the Arctic Ocean, an important factor for climate and ecology. In this study, ...

    • Impacts of Atlantic multi-decadal variability on the Indo-Pacific and Northern Hemisphere climate 

      Svendsen, Lea (Doctoral thesis, 2016-06-03)
      Earlier studies have shown that Atlantic multi-decadal variability (AMY) can impact climate variability globally. However the instrumental records are short compared to the timescale of AMY, and mechanisms for these impacts ...

    • Impacts of climate change on Blue Nile flows using bias-corrected GCM scenarios 

      Elshamy, Mohamed; Seierstad, Ivar Ambjørn; Sorteberg, Asgeir (Peer reviewed; Journal article, 2009)
      This study analyses the output of 17 general circulation models (GCMs) included in the 4th IPCC assessment report. Downscaled precipitation and potential (reference crop) evapotranspiration (PET) scenarios for the 2081– ...

    • Impacts of Greenland Block Location on Clouds and Surface Energy Fluxes over the Greenland Ice Sheet 

      Ward, Jamie; Flanner, Mark G.; Dunn-Sigouin, Etienne (Journal article; Peer reviewed, 2020)
      Clouds and blocking activity have been implicated as causes of increased Greenland Ice Sheet (GrIS) melt in the 21st century. Although Greenland blocks (i.e., long-lasting, mostly stationary anticyclones) generally reduce ...

    • Impacts of the autumn Arctic sea ice on the intraseasonal reversal of the winter Siberian high 

      Lü, Zhuozhuo; He, Shengping; Li, Fei; Wang, Huijun (Peer reviewed; Journal article, 2019-02)
      During 1979–2015, the intensity of the Siberian high (SH) in November and December–January (DJ) is frequently shown to have an out-of-phase relationship, which is accompanied by opposite surface air temperature and circulation ...