Blar i NILU Brage på forfatter "Hansen, Georg Heinrich"

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    • Overvåking av ozonlaget. Årsrapport 1997. 

      Braathen, Geir Ole; Dahlback, Arne; Svenøe, Trond; Hansen, Georg Heinrich (NILU OR;56/98, Research report, 1998)
      Rapporten presenterer måledata for totalozon, vertikalfordelingen av ozon og UV-stråling ved norske målestasjoner i 1997. For Oslo er trenden i totalozon for tidsrommet 1979-1997 beregnet.

    • Recent Arctic ozone depletion: Is there an impact of climate change? 

      Pommereau, Jean-Pierre; Goutail, Florence; Pazmino, Andrea; Lefèvre, Franck; Chipperfield, Martyn P.; Feng, Wuhu; van Roozendael, Michel; Jepsen, Nis; Hansen, Georg Heinrich; Kivi, Rigel; Bognar, Kristof; Strong, Kimberly; Walker, Kaley; Kuzmichev, Alexandr; Khattatov, Slava; Sitnikova, Vera (Journal article; Peer reviewed, 2018)
      After the well-reported record loss of Arctic stratospheric ozone of up to 38% in the winter 2010–2011, further large depletion of 27% occurred in the winter 2015–2016. Record low winter polar vortex temperatures, below ...

    • Study of Chemical and Optical Properties of Biomass Burning Aerosols during Long-Range Transport Events toward the Arctic in Summer 2017 

      Zielinski, Tymon; Bolzacchini, Ezio; Cataldi, Marco; Ferrero, Luca; Grassl, Sandra; Hansen, Georg Heinrich; Mateos, David; Mazzola, Mauro; Neuber, Roland (Peer reviewed; Journal article, 2020)
      Biomass burning related aerosol episodes are becoming a serious threat to the radiative balance of the Arctic region. Since early July 2017 intense wildfires were recorded between August and September in Canada and Greenland, ...

    • Study of the seasonal ozone variations at European high latitudes 

      Werner, R.; Stebel, Kerstin; Hansen, Georg Heinrich; Hoppe, Ulf-Peter; Gausa, Michael; Kivi, R.; Gathen, P. von der; Orsolini, Yvan; Kilifarska, N. (Journal article; Peer reviewed, 2011)
      The geographic area at high latitudes beyond the polar circle is characterized with long darkness during the winter (polar night) and with a long summertime insolation (polar day). Consequentially, the polar vortex is ...

    • 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. ...

    • Trends and annual cycles in soundings of Arctic tropospheric ozone 

      Christiansen, Bo; Jepsen, Nis; Kivi, Rigel; Hansen, Georg Heinrich; Larsen, Niels; Smith Korsholm, Ulrik (Journal article; Peer reviewed, 2017)

    • An Unprecedented Arctic Ozone Depletion Event During Spring 2020 and Its Impacts Across Europe 

      Petkov, Boyan H.; Vitale, Vito; Di Carlo, Piero; Drofa, Oxana; Mastrangelo, Daniele; Smedley, Andrew R.D.; Diemoz, Henri; Siani, Anna-Maria; Fountoulakis, Ilias; Webb, Ann R; Bais, Alkiviadis; Kift, Richard; Rimmer, John; Hansen, Georg Heinrich; Svendby, Tove Marit; Pazmino, Andrea; Werner, Rolf; Atanassov, Atanas M.; Láska, Kamil; De Backer, Hugo; Mangold, Alexander; Köhler, Ulf; Velazco, Voltaire A.; Stübi, René; Solomatnikova, Anna; Pavlova, Kseniya; Sobolewski, Piotr S.; Johnsen, Bjørn; Goutail, Florence; Misaga, Oliver; Aruffo, Eleonora; Metelka, Ladislav; Tóth, Zoltán; Fekete, Dénes; Aculinin, Alexandr A.; Lupi, Angelo; Mazzola, Mauro; Zardi, Federico (Peer reviewed; Journal article, 2023)
      The response of the ozone column across Europe to the extreme 2020 Arctic ozone depletion was examined by analyzing ground-based observations at 38 European stations. The ozone decrease at the northernmost site, Ny-Ålesund ...

    • Vulnerability and resilience of the carbon exchange of a subarctic peatland to an extreme winter event 

      Parmentier, Frans-Jan W.; Rasse, Daniel; Lund, Magnus; Bjerke, Jarle W.; Drake, Bert G.; Weldon, Simon Mark; Tømmervik, Hans; Hansen, Georg Heinrich (Journal article; Peer reviewed, 2018)
      Extreme winter events that damage vegetation are considered an important climatic cause of arctic browning—a reversal of the greening trend of the region—and possibly reduce the carbon uptake of northern ecosystems. ...