Introduction

TJ -worked for WRCP, IGBP, SCOR and IOC: IOC-SCOR-JGOFS CO2-panel, 1995-2001, Active getting the JGOFS office to UiB, 1995-2003, SOLAS SSC, 2000-2009, co-author SOLAS Science Plan, chaired writing group - SOLAS and IMBER Carbon Plan. IOCCP 2001-2009. Involved in initiating and operating BCCR SFF (2002-2012), OTC Director , Memb. ICOS RI, Coordinator of ICOS Norway 2008-2018, Coordinator, SSC member and PI in several EU projects. Past projects: ESOP, ESOP2, IMCORP, CAVASSOO, TRACTOR, CARBOOCEAN, MONARCH, CARBOCHANGE, GREENSEAS, EURO-BASINS, ECO2, FIXO3, ATLANTOS, RINGO, SEACRIFOG, STEMCCS. Ongoing projects: INTAROS.

Disciplines

Climatology, Geology, Oceanography

Skills and expertise

Biogeochemistry, Greenhouse Gases, Climate Change, Carbon, Carbon Cycle, Chemical Oceanography, Carbon Dioxide, Surface Water, Air Climate, Sea Ice, Geology, Environment, OceanEstimation, Ocean Modeling, Ice Cover, Arctic Regions, Standard Error, 13C ATM, Paleoclimatology, Atmosphere, Climate Science, Physical Oceanography, Climate Modeling, Physics of Global Warming, Climate Variability, Climate Dynamics, Regional Climate Modeling, Ocean Currents and Circulation, Data Assimilation, Model Development, Oceanography, Singular Spectrum Analysis, Climatology, Stable Isotopes, Hydrology

Vitenskapelig foredrag

• Skjelvan, Ingunn; Lauvset, Siv Kari; Johannessen, Truls et al. (2023). Decadal trends from the Ocean Weather Station M. (ekstern lenke)
• Beszczynska-Möller, Agnieszka; Ahlstrøm, Andreas P.; Voss, Peter et al. (2021). Enhancement of in situ observing systems in the Arctic. (ekstern lenke)
• Eide, Marie; Olsen, Are; Ninnemann, Ulysses S et al. (2017). Global ocean climatology of the 13C suess effect and preindustrial δ13C. (ekstern lenke)
• Eide, Marie; Olsen, Are; Ninnemann, Ulysses S et al. (2014). Global ocean 13C Suess effect and uptake of anthropogenic CO2. (ekstern lenke)
• Olsen, Are; Tjiputra, Jerry; Andersson, Carin et al. (2014). Current and planned carbon cycle research at the Bjerknes Centre for Climate Research. (ekstern lenke)
• Jeansson, E; Olsen, Are; Eldevik, Tor et al. (2012). A carbon budget for the Nordic Seas. (ekstern lenke)
• Jeansson, Emil; Olsen, Are; Eldevik, Tor et al. (2010). The Nordic Seas Carbon Budget: Sources, Sinks And Uncertainties. (ekstern lenke)
• Johannessen, Truls (2010). Variability of the North Atlantic sink for atmospheric carbon. (ekstern lenke)
• Lauvset, Siv Kari; Olsen, Are; Skjelvan, Ingunn et al. (2009). North Atlantic relationships between surface fCO2 and hydrography, evaluated using fCO2-SST relationships. (ekstern lenke)
• Omar, Abdirahman; Johannessen, Truls (2009). What parameters should be measured in the water column during a baseline study?. (ekstern lenke)
• Omar, Abdirahman; Olsen, Are; Johannessen, Truls (2006). Air-sea CO2 flux variability in the North Sea: 19 months of observations from voluntry observing ships. (ekstern lenke)
• Kasajima, Yoshie; Johannessen, Truls; Skjelvan, Ingunn et al. (2004). The potential role of submesoscale coherent vortices in vertical transport in the Greenland Sea. (ekstern lenke)
• Eldevik, Tor; Drange, Helge; Johannessen, Truls et al. (2002). Resolved and parameterized convective eddies in the Greenland Sea. (ekstern lenke)
• Gascard, Jean-Claude; Watson, Andrew; Messias, Marie-José et al. (2002). Long-lived vortices as a mode of deep ventilation in the Greenland Sea. (ekstern lenke)
• Johannessen, Truls; Bellerby, Richard; Omar, Abdirahman et al. (2001). The role of convection and seasonal to interannual variability on carbon uptake in the Nordic seas. (ekstern lenke)
• Johannessen, Truls; Bellerby, Richard; Omar, Abdirahman et al. (2001). Developing an autonomous high precision pH sensor for high quality pH profiling of the water column and fCO2 measurements from ships of opportunities, "Autonomous Biogeochemical Measurements in the Ocean". (ekstern lenke)
• Bellerby, Richard; Johannessen, Truls (2000). Development of a deep water pH sensor for the COSMOS. (ekstern lenke)
• Johannessen, Truls; Andersson, Leif G.; Bellerby, Richard et al. (2000). The Carbon cycle in the Nordic Seas, a perspective. (ekstern lenke)
• Bellerby, Richard; Olsen, Are; Johannessen, Truls (2000). Spectrophotometric seawater pH in the Weddell and Norwegian Seas: A new tool for monitoring carbon uptake by the ocean. (ekstern lenke)
• Omar, Abdirahman; Johannessen, Truls (2000). Potential brine water sources in Storfjord. (ekstern lenke)
• Hood, E.M.; Merlivat, Lilliane; Johannessen, Truls (1998). pCO2 variations and air-sea flux of CO2 in the Greenland Sea using high-frequency time-series data from CARIOCA drift-buoys. (ekstern lenke)
• Johannessen, Truls; Jansen, Eystein; Anderson, Leif et al. (1997). The Greenland Sea Experiment. Contribution from the ESOP2 scientific team (MAST III-programme). (ekstern lenke)
• Johannessen, Truls; Messias, M-J.; Watson, A.J. et al. (1997). Studies of vertical and horisontal mixing processes in the Greenland Sea based upon the SF6 tracer release experiment. (ekstern lenke)
• Modal, I; Johannessen, Truls; Jansen, Eystein (1997). Carbon Isotopes and The Carbon Cycle in the Greenland Sea. (ekstern lenke)

Rapport

• Beszczynska-Möller, Agnieszka; Ahlstrøm, Andreas; Pirazzini, Roberta et al. (2022). Deliverable 3.16 Synthesis and technical recommendations. (ekstern lenke)
• Jones, Elizabeth Marie; Chierici, Melissa; Skjelvan, Ingunn et al. (2020). Monitoring ocean acidification in Norwegian seas in 2019. (ekstern lenke)
• Johannessen, Truls; Roden, Nicholas Patrick; Olsen, Are et al. (2019). Deliverable 3.7 First implementation and data: North of Svalbard. (ekstern lenke)
• Beck, Johannes; López-Ballesteros, Ana; Omar, Abdirahman et al. (2018). Identification of Key Variables for Climate Change Observation across Africa. SEACRIFOG Deliverable 4.1: Ideal and Mandatory Sets of Variables and Criteria. (ekstern lenke)
• Chierici, Melissa; Skjelvan, Ingunn; Norli, Marit et al. (2016). Overvåking av havforsuring i norske farvann i 2015. (ekstern lenke)
• Lueger, Heike; Wanninkhof, Rik; Olsen, Are et al. (2008). The air-sea CO2 flux in the North Atlantic estimated from satellite and ARGO profiling float data. (ekstern lenke)
• Anderson, Leif; Chierici, M.; Fogelqvist, E. et al. (1997). Excess dissolved inorganic carbon in the deep Greenland Sea, Scientific Report, European Subpolar Ocean Programme (ESOP). (ekstern lenke)

Vitenskapelig artikkel

• Rajasakaren, Balamuralli; Jeansson, Emil; Olsen, Are et al. (2019). Trends in anthropogenic carbon in the Arctic Ocean. (ekstern lenke)
• Quere, C Le; Andrew, Robbie; Friedlingstein, P. et al. (2018). Global Carbon Budget 2018. (ekstern lenke)
• Hvidevold, Hilde Kristine; Alendal, Guttorm; Johannessen, Truls et al. (2016). Survey strategies to quantify and optimize detecting probability of a CO<sub>2</sub> seep in a varying marine environment. (ekstern lenke)
• Yasunaka, Sayaka; Murata, Akihiko; Watanabe, Eiji et al. (2016). Mapping of the air-sea CO2 flux in the Arctic Ocean and its adjacent seas: Basin-wide distribution and seasonal to interannual variability. (ekstern lenke)
• Botnen, Helle Augdal; Omar, Abdirahman; Thorseth, Ingunn Hindenes et al. (2015). The effect of submarine CO2 vents on seawater: Implications for detection of subsea carbon sequestration leakage. (ekstern lenke)
• Bakker, Dorothee C.E.; Pfeil, Benjamin; Olsen, Are et al. (2014). An update to the Surface Ocean CO2 Atlas (SOCAT version 2). (ekstern lenke)
• Lauvset, Siv Kari; Chierici, Melissa; Counillon, Francois et al. (2013). Annual and seasonal fCO(2) and air-sea CO2 fluxes in the Barents Sea. (ekstern lenke)
• Lauvset, Siv Kari; McGills, Wade R.; Bariteau, Ludovic et al. (2011). Direct measurements of CO2 flux in the Greenland Sea. (ekstern lenke)
• Kivimäe, Caroline; Bellerby, Richard; Fransson, Ageneta et al. (2010). A carbon budget for the Barents Sea. (ekstern lenke)
• Telszewski, Maciej; Chazottes, Aymeric; Schuster, Ute et al. (2009). Estimating the monthly pCO2 distribution in the North Atlantic using a self-organizing neural network. (ekstern lenke)
• Pierrot, Denis; Neill, Craig Chandler; Sullivan, Kelvin et al. (2009). Recommendations for autonomous underway pCO(2) measuring systems and data-reduction routines. (ekstern lenke)
• Bellerby, Richard; Schulz, K. G.; Riebesell, U. et al. (2008). Marine ecosystem community carbon and nutrient uptake stoichiometry under varying ocean acidification during the PeECE III experiment. (ekstern lenke)
• Omar, Abdirahman; Johannessen, Truls; Olsen, Are et al. (2007). Seasonal and interannual variability of the air-seaCO(2) flux in the Atlantic sector of the Barents Sea. (ekstern lenke)
• Brewer, PG; Peltzer, ET; Walz, P et al. (2005). Deep ocean experiments with fossil fuel carbon dioxide: Creation and sensing of a controlled plume at 4 km depth. (ekstern lenke)
• Olsson, Anders; Jeansson, E; Anderson, Leif Gunnar et al. (2005). Intermediate water from the Greenland Sea in the Faroe Bank Channel: spreading of released sulphur hexafluoride. (ekstern lenke)
• Olsen, Are; Bellerby, Richard; Johannessen, Truls et al. (2004). Interannual variability in the wintertime air-sea flux of carbon dioxide in the northern North Atlantic, 1981-2001. (ekstern lenke)
• Bellerby, Richard; Olsen, Are; Johannessen, Truls et al. (2002). The Automated Marine pH Sensor (AMpS): a high precision continuous spectrophotometric method for seawater pH measurements. (ekstern lenke)
• Miller, Lisa Ann; Chierici, Melissa; Johannessen, Truls et al. (1999). Seasonal dissolved inorganic carbon distributions in the Greenland Sea and implications for atmospheric CO2 exchange. (ekstern lenke)
• Nesje, Atle; Johannessen, Truls; Birks, Harry John Betteley (1995). Briksdalsbreen, western Norway: climatic effects on the terminal response of a temperate glacier between AD 1901 and 1994. (ekstern lenke)

Faglig foredrag

• Beszczynska-Möller, Agnieszka; Sandven, Stein; Sagen, Hanne et al. (2018). Enhancement of in situ observing systems in the Arctic under INTAROS. (ekstern lenke)
• Skjelvan, Ingunn; Johannessen, Truls (2016). Time series of carbon in a changing climate - examples from Station M in the Norwegian Sea. (ekstern lenke)
• Watson, A.J.; Messias, M-J.; Fogelqvist, E. et al. (1998). Deep convection studied by a tracer release in the Greenland Sea. (ekstern lenke)

Poster

• Rajasakaren, Balamuralli; Jeansson, Emil; Olsen, Are et al. (2017). Decadal Changes in Ventilation and Anthropogenic Carbon in the Intermediate Depths of the Arctic Ocean. (ekstern lenke)
• Jeansson, Emil; Olsen, Are; Jutterström, Sara et al. (2014). Ventilation age and anthropogenic CO2 evolution in the Greenland Sea during the last decade. (ekstern lenke)
• Olsson, A.; Jeansson, Emil; Messias, M. -J. et al. (2008). Pathway and mixing of Greenland Sea water to the Faroe area and the Iceland Basin. (ekstern lenke)
• Lauvset, Siv Kari; Olsen, Are; Johannessen, Truls et al. (2008). Effects of changes in mixing and temperature on carbon dioxide fugacity in the Northern North Atlantic and Norwegian Sea. (ekstern lenke)
• Omar, Abdirahman; Johannessen, Truls; Olsen, Are (2007). CO2 variability in the Barents Sea: synthesis of available data and ongoing measurements. (ekstern lenke)
• Johannessen, Truls; Olsen, Are; Neill, Craig Chandler et al. (2007). pCO2 measurements on the VOS M/V Nuka Arctica in the northern North Atlantic. (ekstern lenke)
• Heinze, Christoph; Johannessen, Truls; Volbers, Andrea Nicole et al. (2005). CARBOOCEAN - an EU Integrated Project focusing on the ocean's role for the uptake of atmospheric CO2. (ekstern lenke)
• Omar, Abdirahman; Johannessen, Truls; Bellerby, Richard et al. (2004). Sea ice and brine formation in Storfjorden: Implications for the Arctic winter time air-sea CO2 flux. (ekstern lenke)
• Omar, Abdirahman; Johannessen, Truls (2001). can cold brine formation intensify the oceanic uptake of atmospheric CO2?. (ekstern lenke)
• Omar, Abdirahman; Johannessen, Truls (2000). Chemical characterisation of waters in Storfjorden. (ekstern lenke)

Vitenskapelig oversiktsartikkel/review

• Bakker, Dorothee C.E.; Pfeil, Benjamin; Landa, Camilla Stegen et al. (2016). A multi-decade record of high-quality fCO2 data in version 3 of the Surface Ocean CO2 Atlas (SOCAT). (ekstern lenke)

Vitenskapelig Kapittel/Artikkel/Konferanseartikkel

• Bakker, Dorothee C.E.; Bange, Hermann W.; Gruber, Nicolas et al. (2014). Air-sea interactions of natural long-lived greenhouse gases (CO2, N2O, CH4)in a changing climate. (ekstern lenke)
• Noji, T.T.; Miller, Lisa A.; Skjelvan, Ingunn et al. (2000). Constraints on carbon drawdown and export in the Greenland Sea. (ekstern lenke)

Intervju

• Johannessen, Truls; Olsen, Are; Borsheim, Knut Yngve et al. (2010). Overvåker forsuring i havet. (ekstern lenke)
• Johannessen, Truls (2009). Havet sluker mindre CO2. (ekstern lenke)
• Johannessen, Truls (2009). Havet tar opp mindre CO2. (ekstern lenke)
• Johannessen, Truls (2009). Havet mettet på CO2. (ekstern lenke)
• Johannessen, Truls (2009). CO2-stans i havet. (ekstern lenke)
• Johannessen, Truls (2002). "Bjerknesforskeres funn forklarer dypvannsdannelse - ny artikkel i Nature". (ekstern lenke)
• Johannessen, Truls (2002). "Bedre kartleggingsmuligheter". Om nye G.O. Sars. (ekstern lenke)

Kronikk

• Skjelvan, Ingunn; Johannessen, Truls; Børsheim, Knut Yngve (2009). Redd Polarfront!. (ekstern lenke)

Doktorgradsavhandling

• Johannessen, Truls (1992). Stable Isotopes as Climatic Indicators in Ocean and Lake Sediments. (ekstern lenke)

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