Blar i NILU Brage på forfatter "Johnsen, Bjørn"
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Comparison of OMI UV observations with ground based measurements at high northern latitudes
Bernhard, Germar; Arola, Antti; Dahlback, Arne; Fioletov, Vitali; Heikkilä, Antti; Johnsen, Bjørn; Koskela, Tapani; Lakkala, Kaisa; Svendby, Tove Marit; Tamminen, Johanna (Journal article; Peer reviewed, 2015) -
GUV long-term measurements of total ozone column and effective cloud transmittance at three Norwegian sites
Svendby, Tove Marit; Johnsen, Bjørn; Kylling, Arve; Dahlback, Arne; Bernhard, Germar H.; Hansen, Georg Heinrich; Petkov, Boyan; Vitale, Vito (Peer reviewed; Journal article, 2021)Measurements of total ozone column and effective cloud transmittance have been performed since 1995 at the three Norwegian sites Oslo/Kjeller, Andøya/Tromsø, and in Ny-Ålesund (Svalbard). These sites are a subset of nine ... -
Monitoring of the atmospheric ozone layer and natural ultraviolet radiation. Annual Report 2020.
Svendby, Tove Marit; Hansen, Georg Heinrich; Bäcklund, Are; Nilsen, Anne-Cathrine; Schulze, Dorothea; Johnsen, Bjørn (NILU report;18/2021, Research report, 2021)This report summarizes the results from the Norwegian monitoring programme on stratospheric ozone and UV radiation measurements. The ozone layer has been measured at three locations since 1979: In Oslo/Kjeller, Tromsø/Andøya ... -
Monitoring of the atmospheric ozone layer and natural ultraviolet radiation. Annual report 2021.
Svendby, Tove Marit; Hansen, Georg H.; Bernet, Leonie; Bäcklund, Are; Nilsen, Anne-Cathrine; Schulze, Dorothea; Johnsen, Bjørn (NILU report;25/2022, Research report, 2022)This report summarizes the results from the Norwegian monitoring programme on stratospheric ozone and UV radiation measurements. The ozone layer has been measured at three locations since 1979: In Oslo/Kjeller, Tromsø/Andøya ... -
Monitoring of the atmospheric ozone layer and natural ultraviolet radiation. Annual Report 2022.
Svendby, Tove Marit; Fjæraa, Ann Mari; Nilsen, Anne-Cathrine; Schulze, Dorothea; Johnsen, Bjørn (NILU report;16/2023, Research report, 2023)This report summarizes the results from the Norwegian monitoring programme on stratospheric ozone and UV radiation measurements. The ozone layer has been measured at three locations since 1979: In Oslo/Kjeller, Tromsø/Andøya ... -
Real-time UV index retrieval in Europe using Earth observation-based techniques: system description and quality assessment
Kosmopoulos, Panagiotis G.; Kazadzis, Stelios; Schmalwieser, Alois W.; Raptis, Panagiotis I.; Papachristopoulou, Kyriakoula; Fountoulakis, Ilias; Masoom, Akriti; Bais, Alkiviadis F.; Bilbao, Julia; Blumthaler, Mario; Kreuter, Axel; Siani, Anna Maria; Eleftheratos, Kostas; Topaloglou, Chrystanthi; Gröbner, Julian; Johnsen, Bjørn; Svendby, Tove Marit (Peer reviewed; Journal article, 2021)This study introduces an Earth observation (EO)-based system which is capable of operationally estimating and continuously monitoring the ultraviolet index (UVI) in Europe. UVIOS (i.e., UV-Index Operating System) exploits ... -
Record‐Breaking Increases in Arctic Solar Ultraviolet Radiation Caused by Exceptionally Large Ozone Depletion in 2020
Bernhard, Germar H.; Fioletov, Vitali E.; Grooss, Jens-Uwe; Ialongo, Iolanda; Johnsen, Bjørn; Lakkala, Kaisa; Manney, Gloria L.; Müller, Rolf; Svendby, Tove Marit (Peer reviewed; Journal article, 2020)Measurements of solar ultraviolet radiation (UVR) performed between January and June 2020 at 10 Arctic and subarctic locations are compared with historical observations. Differences between 2020 and prior years are also ... -
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 ... -
UV index monitoring in Europe
Schmalwieser, Alois W.; Gröbner, Julian; Blumthaler, Mario; Klotz, Barbara; De Backer, Hugo; Bolsee, David; Werner, Rolf; Tomsic, Davor; Metelka, Ladislav; Eriksen, Paul; Jepsen, Nis; Aun, Margit; Heikkilä, Anu; Duprat, Thierry; Sandmann, Henner; Weiss, Tilman; Bais, Alkis; Toth, Zoltan; Siani, Anna-Maria; Vaccaro, Luisa; Diémoz, Henri; Grifoni, Daniele; Zipoli, Gaetano; Lorenzetto, Giuseppe; Petkov, Boyan H.; Di Sarra, Alcide Giorgio; Massen, Francis; Yousif, Charles; Aculinin, Alexandr A.; Den Outer, Peter; Svendby, Tove Marit; Dahlback, Arne; Johnsen, Bjørn; Biszczuk-Jakubowska, Julita; Krzyscin, Janusz; Henriques, Diamantino; Chubarova, Natalia; Kolarž, Predrag; Mijatovic, Zoran; Groselj, Drago; Pribullova, Anna; Gonzales, Juan Ramon Moreta; Bilbao, Julia; Guerrero, José Manuel Vilaplana; Serrano, Antonio; Andersson, Sandra; Vuilleumier, Laurent; Webb, Ann; O'Hagan, John (Journal article; Peer reviewed, 2017) -
Validation of the TROPOspheric Monitoring Instrument (TROPOMI) surface UV radiation product
Lakkala, Kaisa; Kujanpää, Jukka; Brogniez, Colette; Henriot, Nicolas; Arola, Antti; Aun, Margit; Auriol, Frédérique; Bais, Alkiviadis F.; Bernhard, Germar; De Bock, Veerle; Catalfamo, Maxime; Deroo, Christine; Diémoz, Henri; Egli, Luca; Forestier, Jean-Baptiste; Fountoulakis, Ilias; Garane, Katerina; Garcia, Rosa Delia; Gröbner, Julian; Hassinen, Seppo; Heikkilä, Anu; Henderson, Stuart; Hülsen, Gregor; Johnsen, Bjørn; Kalakoski, Niilo; Karanikolas, Angelos; Karppinen, Tomi; Lamy, Kevin; León-Luis, Sergio F.; Lindfors, Anders V.; Metzger, Jean-Marc; Minvielle, Fanny; Muskatel, Harel B.; Portafaix, Thierry; Redondas, Alberto; Sanchez, Ricardo; Siani, Anna Maria; Svendby, Tove Marit; Tamminen, Johanna (Peer reviewed; Journal article, 2020)The TROPOspheric Monitoring Instrument (TROPOMI) onboard the Sentinel-5 Precursor (S5P) satellite was launched on 13 October 2017 to provide the atmospheric composition for atmosphere and climate research. The S5P is a ...