Browsing NTNU Open by Author "Orsolini, Yvan"

Now showing items 1-7 of 7

    • Energetic particle precipitation influences global secondary ozone distribution 

      Jia, Jia; Murberg, Lise Eder; Løvset, Tiril; Orsolini, Yvan; Espy, Patrick Joseph; Zeller, Lilou C. G.; Salinas, Cornelius Csar Jude H.; Lee, Jae N.; Wu, Dong; Zhang, Jiarong (Journal article; Peer reviewed, 2024)
      The secondary ozone layer is a global peak in ozone abundance in the upper mesosphere-lower thermosphere (UMLT) around 90-95 km. The effect of energetic particle precipitation (EPP) from geomagnetic processes on this UMLT ...

    • Impacts of UV irradiance and medium-energy electron precipitation on the North Atlantic oscillation during the 11-year solar cycle 

      Guttu, Sigmund; Orsolini, Yvan; Stordal, Frode; Otterå, Odd Helge; Omrani, Nour-Eddine; Tartaglione, Nazario; Verronen, Pekka T.; Rodger, Craig J.; Clilverd, Mark A. (Peer reviewed; Journal article, 2021)
      Observational studies suggest that part of the North Atlantic Oscillation (NAO) variability may be attributed to the spectral ultra-violet (UV) irradiance variations associated to the 11-year solar cycle. The observed ...

    • Modelling the descent of nitric oxide during the elevated stratopause event of January 2013 

      Orsolini, Yvan; Limpasuvan, Varavut; Pérot, Kristell; Espy, Patrick Joseph; Hibbins, Robert; Lossow, Stefan; Raaholt Larsson, Katarina; Murtagh, Donal (Journal article; Peer reviewed, 2017)
      Using simulations with a whole-atmosphere chemistry-climate model nudged by meteorological analyses, global satellite observations of nitrogen oxide (NO) and water vapour by the Sub-Millimetre Radiometer instrument (SMR), ...

    • Observations of gravity wave forcing of the mesopause region during the January 2013 major Sudden Stratospheric Warming 

      De Wit, Rosmarie Johanna; Hibbins, Robert; Espy, Patrick Joseph; Orsolini, Yvan; Limpasuvan, Varavut; Kinnison, Douglas E. (Journal article; Peer reviewed, 2014)
      Studies of vertical and interhemispheric coupling during Sudden Stratospheric Warmings (SSWs) suggest that gravity wave (GW) momentum flux divergence plays a key role in forcing the middle atmosphere, although observational ...

    • Observations of planetary waves in the mesosphere-lower thermosphere during stratospheric warming events 

      Stray, Nora Henriette; Orsolini, Yvan; Espy, Patrick Joseph; Limpasuvan, Varavut; Hibbins, Robert (Journal article; Peer reviewed, 2015-05-04)
      This study investigates the effect of stratospheric sudden warmings (SSWs) on planetary wave (PW) activity in the mesosphere–lower thermosphere (MLT). PW activity near 95 km is derived from meteor wind data using a chain ...

    • SuperDARN Observations of Semidiurnal Tidal Variability in the MLT and the Response to Sudden Stratospheric Warming Events 

      Hibbins, Robert; Espy, Patrick Joseph; Orsolini, Yvan; Limpasuvan, Varavut; Barnes, R. J. (Journal article; Peer reviewed, 2019)
      Using meteor wind data from the Super Dual Auroral Radar Network (SuperDARN) in the Northern Hemisphere, we (1) demonstrate that the migrating (Sun‐synchronous) tides can be separated from the nonmigrating components in ...

    • Total ozone trends at three northern high-latitude stations 

      Bernet, Leonie; Svendby, Tove Marit; Hansen, Georg Heinrich; Orsolini, Yvan; Dahlback, Arne; Goutail, Florence; Pazmino, Andrea; Petkov, Boyan; Kylling, Arve (Peer reviewed; Journal article, 2023)
      After the decrease of ozone-depleting substances (ODSs) as a consequence of the Montreal Protocol, it is still challenging to detect a recovery in the total column amount of ozone (total ozone) at northern high latitudes. ...