Now showing items 1-20 of 26

    • Anthropogenic increase of oceanic pCO2 in the Barents Sea surface water 

      Omar, Abdirahman M.; Johannessen, Truls; Kaltin, Staffan; Olsen, Are (American Geophysical Union, 2003-12-26)
      We evaluate the change of surface water CO2 partial pressure ( pCO2 sw) in the Barents Sea (BS) between 1967 and 2000–2001. We use temperature (T) data collected during a survey in the BS in 1967 and a relationship between ...
      Peer reviewedJournal article
    • Aragonite saturation states and pH in western Norwegian fjords: Seasonal cycles and controlling factors, 2005-2009 

      Omar, Abdirahman; Skjelvan, Ingunn; Erga, Svein Rune; Olsen, Are (Copernicus Publications, 2016-07-26)
      The uptake of anthropogenic carbon dioxide (CO2) by the ocean leads to a process known as ocean acidification (OA), which lowers the aragonite saturation state (ΩAr) and pH, and this is poorly documented in coastal ...
      Journal article
    • Arctic Ocean CO2 uptake: An improved multiyear estimate of the air-sea CO2 flux incorporating chlorophyll a concentrations 

      Yasunaka, Sayaka; Siswanto, Eko; Olsen, Are; Hoppema, Mario; Watanabe, Eiji; Fransson, Agneta Ingrid; Chierici, Melissa; Murata, Akihiko; Lauvset, Siv Kari; Wanninkhof, Rik; Takahashi, Taro; Kosugi, Naohiro; Omar, Abdirahman; van Heuven, Steven; Mathis, Jeremy T. (EGU, 2018-03-22)
      We estimated monthly air–sea CO2 fluxes in the Arctic Ocean and its adjacent seas north of 60∘ N from 1997 to 2014. This was done by mapping partial pressure of CO2 in the surface water (pCO2w) using a self-organizing map ...
      Journal article
    • Continued warming, salinification and oxygenation of the Greenland Sea gyre 

      Lauvset, Siv Kari; Brakstad, Ailin Dale; Våge, Kjetil; Olsen, Are; Jeansson, Emil; Mork, Kjell Arne (Informa UK Limited, 2018-06-18)
      The Greenland Sea gyre is one of the few areas where the water column is ventilated through open ocean convection. This process brings both anthropogenic carbon and oxygen from the atmosphere and surface ocean into the ...
      Journal article
    • The effect of wind speed products and wind speed-gas exchange relationships on interannual variability of the air-sea CO2 gas transfer velocity 

      Olsen, Are; Wanninkhof, Rik; Triñanes, Joaquin; Johannessen, Truls (Blackwell, 2005)
      The lack of a firm relationship between wind speed (U10) and gas transfer velocity (k) is considered to be one of the factors that hinders accurate quantification of interannual variations of ocean–atmosphere CO2 fluxes. ...
      Journal article
    • Effects of sea-ice and biogeochemical processes and storms on under-ice water fCO2 during the winter-spring transition in the high Arctic Ocean: Implications for sea-air CO2 fluxes 

      Fransson, Agneta Ingrid; Chierici, Melissa; Skjelvan, Ingunn; Olsen, Are; Assmy, Philipp; Peterson, Algot Kristoffer; Spreen, Gunnar; Ward, Brian (American Geophysical Union, 2017-07)
      We performed measurements of carbon dioxide fugacity (fCO2) in the surface water under Arctic sea ice from January to June 2015 during the Norwegian young sea ICE (N-ICE2015) expedition. Over this period, the ship drifted ...
      Journal article
    • Global carbon budget 2014 

      Le Quéré, Corinne; Moriarty, Roisin; Andrew, Robbie; Peters, Glen Philip; Ciais, Philippe; Friedlingstein, Pierre; Jones, Samantha D.; Sitch, Stephen; Tans, Pieter; Arneth, Almut; Boden, Thomas A.; Bopp, Laurent; Bozec, Yann; Canadell, Josep G.; Chini, Louise P.; Chevallier, Frédéric; Cosca, Cathrine E.; Harris, Ian C.; Hoppema, Mario; Houghton, Richard A.; House, Joanna I.; Jain, Atul K.; Johannessen, Truls; Kato, Etsushi; Keeling, Ralph F.; Kitidis, Vassilis; Klein Goldewijk, Kees; Koven, Charles D.; Landa, Camilla Stegen; Landschützer, Peter; Lenton, Andrew; Lima, Ivan D.; Marland, Gregg; Mathis, Jeremy T.; Metzl, Nicolas; Nojiri, Yukihiro; Olsen, Are; Ono, Tsuneo; Peng, Shushi; Peters, Wouter; Pfeil, Benjamin; Poulter, Benjamin; Raupach, Michael R.; Regnier, Pierre; Rödenbeck, Christian; Saito, Shu; Salisbury, Joseph E.; Schuster, Ute; Schwinger, Jörg; Séférian, Roland; Segschneider, Joachim; Steinhoff, Tobias; Stocker, Benjamin D.; Sutton, Adrienne J.; Takahashi, Taro; Tilbrook, Bronte; van der Werf, Guido R.; Viovy, Nicolas; Wang, Yingping; Wanninkhof, Rik; Wiltshire, Andrew J.; Zeng, Ning (Copernicus Publications, 2015-05-08)
      Accurate assessment of anthropogenic carbon dioxide (CO2) emissions and their redistribution among the atmosphere, ocean, and terrestrial biosphere is important to better understand the global carbon cycle, support the ...
      Journal article
    • Global Carbon Budget 2015 

      Le Quéré, Corinne; Moriarty, Roisin; Andrew, Robbie; Canadell, Josep G.; Sitch, Stephen; Korsbakken, Jan Ivar; Friedlingstein, Pierre; Peters, Glen Philip; Andres, Robert J.; Boden, Thomas A.; Houghton, Richard A.; House, Joanna I.; Keeling, Ralph F.; Tans, Pieter; Arneth, Almut; Bakker, Dorothée C.E.; Barbero, Leticia; Bopp, Laurent; Chang, Joseph; Chevallier, Frédéric; Chini, Louise P.; Ciais, Philippe; Fader, Marianela; Feely, Richard A.; Gkritzalis, Thanos; Harris, Ian; Hauck, Judith; Ilyina, Tatiana; Jain, Atul K.; Kato, Etsushi; Kitidis, Vassilis; Goldewijk, K. Klein; Koven, Charles Dunbar; Landschützer, Peter; Lauvset, Siv Kari; Lefévre, Nathalie; Lenton, Andrew; Lima, Ivan D.; Metzl, Nicolas; Millero, Frank; Munro, David R.; Murata, Aki; Nabel, Julia E.M.S.; Nakaoka, Shinichirou; Nojiri, Yukihiro; O'Brien, Kevin; Olsen, Are; Ono, Tsuneo; Pérez, Fiz Fernández; Pfeil, Benjamin; Pierrot, Denis; Poulter, Benjamin; Rehder, Gregor; Rödenbeck, Christian; Saito, Shu; Schuster, Ute; Schwinger, Jörg; Séférian, Roland; Steinhoff, Tobias; Stocker, Benjamin D.; Sutton, Adrienne J.; Takahashi, Taro; Tilbrook, Bronte; van der Laan-Luijkx, Ingrid Theodora; van der Werf, Guido R.; van Heuven, Steven; Vandemark, Douglas; Viovy, Nicolas; Wiltshire, Andy; Zaehle, Sönke; Zeng, Ning (Copernicus Publications, 2015-12-07)
      Accurate assessment of anthropogenic carbon dioxide (CO2) emissions and their redistribution among the atmosphere, ocean, and terrestrial biosphere is important to better understand the global carbon cycle, support the ...
      Journal article
    • Global Carbon Budget 2016 

      Le Quéré, Corinne; Andrew, Robbie; Canadell, Josep G.; Sitch, Stephen; Korsbakken, Jan Ivar; Peters, Glen Philip; Manning, Andrew C; Boden, Thomas A; Tans, Pieter P; Houghton, Richard A; Keeling, Ralph F; Alin, Simone; Andrews, Oliver D; Anthoni, Peter; Barbero, Leticia; Bopp, Laurent; Chevallier, Frederic; Chini, Louise P; Ciais, Philippe; Currie, Kim; Delire, Christine; Doney, Scott C; Friedlingstein, Pierre; Gkritzalis, Thanos; Harris, Ian; Hauck, Judith; Haverd, Vanessa; Hoppema, Mario; Klein Goldewijk, Kees; Jain, Atul K; Kato, Etsushi; Körtzinger, Arne; Landschutzer, Peter; Lefevre, Nathalie; Lenton, Andrew; Lienert, Sebastian; Lombardozzi, Danica; Melton, Joe R; Metzl, Nicolas; Millero, Frank; Monteiro, Pedro M S; Munro, David R; Nabel, Julia E M S; Nakaoka, Shin-Ichiro; O'Brien, Kevin; Olsen, Are; Omar, Abdirahman; Pierrot, Denis; Ono, Tsuneo; Poulter, Benjamin; Rödenbeck, Christian; Salisbury, Joe; Schuster, Ute; Schwinger, Jörg; Seferian, Roland; Skjelvan, Ingunn; Stocker, Benjamin D; Sutton, Adrienne J; Takahashi, Taro; Tian, Hanqin; Tilbrook, Bronte; Van Der Laan-Luijkx, Ingrid T; Van Der Werf, Guido R; Viovy, Nicolas; Walker, Anthony P; Wiltshire, Andrew J; Zaehle, Sönke (Copernicus Publications, 2016-11-14)
      Accurate assessment of anthropogenic carbon dioxide (CO2) emissions and their redistribution among the atmosphere, ocean, and terrestrial biosphere – the “global carbon budget” – is important to better understand the global ...
      Journal article
    • Inorganic Carbon and Water Masses in the Irminger Sea since 1991 

      Fröb, Friederike; Olsen, Are; Pérez, Fiz F.; García-Ibáñez, Maribel I.; Jeansson, Emil; Omar, Abdirahman; Lauvset, Siv K. (European Geosciences Union, 2017-02-17)
      The subpolar gyre region in the North Atlantic is a major sink for anthropogenic carbon. While the storage rates show large interannual variability related to atmospheric forcing, less is known about variability in the ...
      Journal article
    • Interannual sea-air CO2 flux variability from an observation-driven ocean mixed-layer scheme 

      Rödenbeck, Christian; Bakker, Dorothée C.E.; Metzl, Nicolas; Olsen, Are; Sabine, Christopher; Cassar, Nicolas; Reum, Friedemann; Keeling, Ralph F.; Heimann, Martin (Copernicus Publications, 2014-09-01)
      Interannual anomalies in the sea–air carbon dioxide (CO2) exchange have been estimated from surface-ocean CO2 partial pressure measurements. Available data are sufficient to constrain these anomalies in large parts of the ...
      Journal article
    • Interannual variability in the wintertime air–sea flux of carbon dioxide in the northern North Atlantic, 1981–2001 

      Olsen, Are; Bellerby, Richard G. J.; Johannessen, Truls; Omar, Abdirahman M.; Skjelvan, Ingunn (Elsevier, 2003)
      Gridded fields of sea surface temperature (SST), sea level pressure (SLP), and wind speed were used in combination with data for the atmospheric mole fraction of CO2 and an empirical relationship between measured values ...
      Journal articlePeer reviewed
    • Long-term surface pCO2 trends from observations and models 

      Tjiputra, Jerry; Olsen, Are; Bopp, Laurent; Lenton, Andrew; Pfeil, Benjamin; Roy, Tilla; Segschneider, Joachim; Totterdell, Ian; Heinze, Christoph (Co-Action PublishingThe International Meteorological Institute in Stockholm, 2014-05-19)
      We estimate regional long-term surface ocean pCO2 growth rates using all available underway and bottled biogeochemistry data collected over the past four decades. These observed regional trends are compared with those ...
      Journal article
    • Mg/Ca ratios in the planktonic foraminifer Neogloboquadrina pachyderma (sinistral) in the northern North Atlantic/Nordic Seas 

      Meland, Marius Yddal; Jansen, Eystein; Elderfield, Henry; Dokken, Trond Martin; Olsen, Are; Bellerby, Richard G. J. (American Geophysical Union, 2006-06-15)
      In core top samples in the Nordic Seas, Mg/Ca ratios of N. pachyderma (sin.) are generally consistent with previous high-latitude calibration data but do not reflect the modern calcification temperature gradient from 2ºC ...
      Journal articlePeer reviewed
    • A model study of the seasonal and long-term North Atlantic surface pCO(2) variability 

      Tjiputra, Jerry; Olsen, Are; Assmann, Karen Margarete; Pfeil, Benjamin; Heinze, Christoph (Copernicus Publications, 2012-03-05)
      A coupled biogeochemical-physical ocean model is used to study the seasonal and long–term variations of surface pCO2 in the North Atlantic Ocean. The model agrees well with recent underway pCO2 observations from the Surface ...
      Journal article
    • A multi-decade record of high-quality fCO2 data in version 3 of the Surface Ocean CO2 Atlas (SOCAT) 

      Bakker, Dorothee C.E.; Pfeil, Benjamin; Landa, Camilla Stegen; Metzl, Nicolas; O'Brien, Kevin M.; Olsen, Are; Smith, Karl; Cosca, Cathy; Harasawa, Sumiko; Jones, Stephen Daniel; Nakaoka, Shin-Ichiro; Nojiri, Yukihiro; Schuster, Ute; Steinhoff, Tobias; Sweeney, Colm; Takahashi, Taro; Tilbrook, Bronte; Wada, Chisato; Wanninkhof, Rik; Alin, Simone R.; Balestrini, Carlos F.; Barbero, Leticia; Bates, Nicholas R.; Bianchi, Alejandro A.; Bonou, Frédéric; Boutin, Jacqueline; Bozec, Yann; Burger, Eugene F.; Cai, Wei-Jun; Castle, Robert D.; Chen, Liqi; Chierici, Melissa; Currie, Kim; Evans, Wiley; Featherstone, Charles; Feely, Richard A.; Fransson, Agneta Ingrid; Goyet, Catherine; Greenwood, Naomi; Gregor, Luke; Hankin, Steven; Hardman-Mountford, Nick J.; Harlay, Jérôme; Hauck, Judith; Hoppema, Mario; Humphreys, Matthew P.; Hunt, Christopher W.; Huss, Betty; Ibanhez, J. Severino P.; Johannessen, Truls; Keeling, Ralph; Kitidis, Vassilis; Körtzinger, Arne; Kozyr, Alex; Krasakopoulou, Evangelia; Kuwata, Akira; Landschützer, Peter; Lauvset, Siv Kari; Lefevre, Nathalie; Lo Monaco, Claire; Manke, Ansley; Mathis, Jeremy T.; Merlivat, Liliane; Millero, Frank J.; Monteiro, Pedro M.S.; Munro, David R.; Murata, Akihiko; Newberger, Timothy; Omar, Abdirahman; Ono, Tsuneo; Paterson, Kristina; Pearce, David A.; Pierrot, Denis; Robbins, Lisa L.; Saito, Shu; Salisbury, Joe; Schlitzer, Reiner; Schneider, Bernd; Schweitzer, Roland; Sieger, Rainer; Skjelvan, Ingunn; Sullivan, Kevin F.; Sutherland, Stewart C.; Sutton, Adrienne J.; Tadokoro, Kazuaki; Telszewski, Maciej; Tuma, Matthias; Van Heuven, Steven M.A.C.; Vandemark, Doug; Ward, Brian; Watson, Andrew J.; Xu, Suqing (Copernicus Publications, 2016-09-15)
      The Surface Ocean CO2 Atlas (SOCAT) is a synthesis of quality-controlled fCO2 (fugacity of carbon dioxide) values for the global surface oceans and coastal seas with regular updates. Version 3 of SOCAT has 14.7 million ...
      Journal article
    • A new global interior ocean mapped climatology: the 1° ×  1° GLODAP version 2 

      Lauvset, Siv Kari; Key, Robert M.; Olsen, Are; van Heuven, Steven; Velo, Antón; Lin, Xiaohua; Schirnick, Carsten; Kozyr, Alex; Tanhua, Toste; Hoppema, Mario; Jutterström, Sara; Steinfeldt, Reiner; Jeansson, Emil; Ishii, Masao; Pérez, Fiz F.; Suzuki, Toru; Watelet, Sylvain (Copernicus Publications, 2016-08-15)
      We present a mapped climatology (GLODAPv2.2016b) of ocean biogeochemical variables based on the new GLODAP version 2 data product (Olsen et al., 2016; Key et al., 2015), which covers all ocean basins over the years 1972 ...
      Journal article
    • Ocean acidification in the subpolar North Atlantic: rates and mechanisms controlling pH changes 

      García-Ibáñez, Maribel I.; Zunino, Patricia; Fröb, Friederike; Carracedo, Lidia I.; Ríos, Aida F.; Mercier, Herlé; Olsen, Are; Pérez, Fiz F. (European Geosciences Union, 2016-06-23)
      Repeated hydrographic sections provide critically needed data on and understanding of changes in basin-wide ocean CO2 chemistry over multi-decadal timescales. Here, high-quality measurements collected at twelve cruises ...
      Journal article
    • On the nature of the factors that control spring bloom development at the entrance to the Barents Sea and their interannual variability 

      Olsen, Are; Johannessen, Truls; Rey, Francisco (Taylor & Francis, 2003-12)
      Analysis of data obtained by the Institute of Marine Research, Norway, at their regular surveys of the Fugløya-Bjørnøya section, between the northern tip of Norway and Bear Island, has allowed for an identification of the ...
      Journal article
    • Productivity in the Barents Sea - Response to recent climate variability 

      Dalpadado, Padmini; Arrigo, Kevin R.; Hjøllo, Solfrid Sætre; Rey, Francisco; Ingvaldsen, Randi; Sperfeld, Erik; van Dijken, Gert L.; Stige, Leif Christian; Olsen, Are; Ottersen, Geir (PLoS, 2014-05-01)
      The temporal and spatial dynamics of primary and secondary biomass/production in the Barents Sea since the late 1990s are examined using remote sensing data, observations and a coupled physical-biological model. Field ...
      Journal article