Henrik Hovland Svensen

• Torsvik, Trond Helge; Svensen, Henrik; Steinberger, Bernhard; Royer, Dana L.; Jerram, Dougal Alexander & Jones, Morgan Thomas [Show all 7 contributors for this article] (2021). Connecting the Deep Earth and the Atmosphere. Geophysical Monograph. ISSN 0065-8448. 263, p. 413–453. doi: 10.1002/9781119528609.ch16.
• Heimdal, Thea Hatlen; Goddéris, Yves; Jones, Morgan Thomas & Svensen, Henrik Hovland (2021). Assessing the importance of thermogenic degassing from the Karoo Large Igneous Province (LIP) in driving Toarcian carbon cycle perturbations. Nature Communications. ISSN 2041-1723. 12(1). doi: 10.1038/s41467-021-26467-6.
• Callegaro, Sara; Svensen, Henrik Hovland; Neumann, Else Ragnhild; Planke, Sverre; Jerram, Dougal Alexander & Polozov, Alexander [Show all 7 contributors for this article] (2021). Geochemistry of deep Tunguska Basin sills, Siberian Traps: correlations and potential implications for the end-Permian environmental crisis. Contributions to Mineralogy and Petrology. ISSN 0010-7999. doi: 10.1007/s00410-021-01807-3. Full text in Research Archive
• Bastos, Lucas Pinto Heckert; Rodrigues, René; Pereira, Egberto; Bergamaschi, Sergio; Alferes, Carmen Lucia Ferreira & Augland, Lars Eivind [Show all 9 contributors for this article] (2021). The birth and demise of the vast epicontinental Permian Irati-Whitehill sea: Evidence from organic geochemistry, geochronology, and paleogeography. Palaeogeography, Palaeoclimatology, Palaeoecology. ISSN 0031-0182. 562, p. 1–13. doi: 10.1016/j.palaeo.2020.110103.
• Stokke, Ella W.; Jones, Morgan Thomas; Riber, Lars; Haflidason, Haflidi; Midtkandal, Ivar & Schultz, Bo [Show all 7 contributors for this article] (2021). Rapid and sustained environmental responses to global warming: The Paleocene-Eocene Thermal Maximum in the eastern North Sea. Climate of the Past. ISSN 1814-9324. 17(5), p. 1989–2013. doi: 10.5194/cp-17-1989-2021.
• Neumann, Else Ragnhild; Marsh, J.S.; Galerne, Christophe Yann; Polteau, Stephane; Svensen, Henrik & Planke, Sverre (2020). Co-existing low-Ti and high-Ti dolerites in two large dykes in the Gap Dyke swarm, southeastern Karoo Basin (South Africa). South African Journal of Geology. ISSN 1012-0750. 123(1), p. 19–34. doi: 10.25131/sajg.123.0003.
• Svensen, Henrik; Hammer, Øyvind; Chevallier, Luc; Jerram, Dougal Alexander; Silkoset, Petter & Polteau, Stephane [Show all 7 contributors for this article] (2020). Understanding thermogenic degassing in large igneous provinces: Inferences from the geological and statistical characteristics of breccia pipes in the western parts of the Karoo Basin. In Adatte, Thierry; Bond, David P.G. & Keller, Gerta (Ed.), Mass extinctions, volcanism, and impacts. Geological Society of America. ISSN 9780813725444. p. 67–84.
• Heimdal, Thea Hatlen; Jones, Morgan Thomas & Svensen, Henrik (2020). Thermogenic carbon release from the Central Atlantic magmatic province caused major end-Triassic carbon cycle perturbations. Proceedings of the National Academy of Sciences of the United States of America. ISSN 0027-8424. 117(22), p. 11968–11974. doi: 10.1073/pnas.2000095117. Full text in Research Archive
• Schobben, Martin; Foster, William J.; Sleveland, Arve; Zuchuat, Valentin; Svensen, Henrik & Planke, Sverre [Show all 11 contributors for this article] (2020). A nutrient control on marine anoxia during the end-Permian mass extinction. Nature Geoscience. ISSN 1752-0894. 13, p. 640–646. doi: 10.1038/s41561-020-0622-1. Show summary

  Oxygen deprivation and hydrogen sulfide toxicity are considered potent kill mechanisms during the mass extinction just before the Permian–Triassic boundary (~251.9 million years ago). However, the mechanism that drove vast stretches of the ocean to an anoxic state is unclear. Here, we present palaeoredox and phosphorus speciation data for a marine bathymetric transect from Svalbard. This shows that, before the extinction, enhanced weathering driven by Siberian Traps volcanism increased the influx of phosphorus, thus enhancing marine primary productivity and oxygen depletion in proximal shelf settings. However, this non-sulfidic state efficiently sequestered phosphorus in the sediment in association with iron minerals, thus restricting the intensity and spatial extent of oxygen-depleted waters. The collapse of vegetation on land immediately before the marine extinction changed the relative weathering influx of iron and sulfate. The resulting transition to euxinic (sulfidic) conditions led to enhanced remobilization of bioavailable phosphorus, initiating a feedback that caused the spread of anoxic waters across large portions of the shelf. This reconciles a lag of >0.3 million years between the onset of enhanced weathering and the development of widespread, but geographically variable, ocean anoxia, with major implications for extinction selectivity.

• Zuchuat, Valentin; Sleveland, Arve; Twitchett, Richard; Svensen, Henrik; Turner, Holly & Augland, Lars Eivind [Show all 12 contributors for this article] (2020). A new high-resolution stratigraphic and palaeoenvironmental record spanning the End-Permian Mass Extinction and its aftermath in central Spitsbergen, Svalbard. Palaeogeography, Palaeoclimatology, Palaeoecology. ISSN 0031-0182. 554. doi: 10.1016/j.palaeo.2020.109732. Full text in Research Archive Show summary

  Research on the Permian-Triassic boundary (PTB) along the northern margins of Pangaea (exposed today in the Arctic region) has been heavily reliant on field observations, where data resolution was consequently determined by outcrop condition and accessibility. Core drilling in central Spitsbergen allowed for a near-complete recovery of two ~90 m cores through the PTB. Analyses of the core and nearby outcrops include stratigraphic logging and sampling, XRF scanning, petrography, biostratigraphy, isotope geochemistry, and geochronology. The First Appearance Datum (FAD) of H. parvus in Svalbard places the base of the Triassic ca. 4 m above the base of the Vikinghøgda Formation, and ca. 2.50 m above the End-Permian Mass Extinction (EPME) and its associated sharp negative δ13C. The PTB therefore falls within the Reduviasporonites chalastus Assemblage Zone in Svalbard. Precise U-Pb TIMS dating of two zircon crystals in a tephra layer just above the first documented Hindeodus parvus in Svalbard gives an age of 252.13 ± 0.62 Ma. High-resolution palaeoenvironmental proxies, including Si/kcps (kilo counts per second), Zr/Rb, K/Ti, Fe/K, and V/Cr, indicate a transition towards a more arid climate in the earliest Triassic, contemporaneous with prolonged bottom-water dysoxic/anoxic conditions, following an increase in volcanic activity in the Late Permian. Statistical analysis of Zr/Rb, K/Ti and V/Cr elemental ratios suggests that the system was impacted by long-eccentricity (400 kyr) cyclicity. The δ13C excursion in organic carbon (δ13Corg) record signals a large negative carbon isotope excursion (CIE) associated with the mass extinction event, but also records a second, smaller negative CIE ca. 22 m above this interval. This younger δ13Corg excursion correlates to similar CIEs in the Dienerian (late Induan) records of other sections, notably in the Tethys Ocean, which have been interpreted as recording a small biotic crisis during the post-extinction recovery. Evidence of this negative CIE in Spitsbergen suggests that the Dienerian crisis may have been global in extent. The negative δ13Corg values are associated with evidence for dysoxia or anoxia in the core, and the occurrence of tephra layers in the same interval suggests a possible connection between the Dienerian crisis and a discrete episode of volcanic activity.

• Polteau, Stephane; Planke, Sverre; Zastrozhnov, Dmitrii; Abdelmalak, Mohamed Mansour; Lebedeva-Ivanova, Nina & Eckhoff Planke, Ellen [Show all 14 contributors for this article] (2020). Upper cretaceous-paleogene stratigraphy and development of the Mímir High, Vøring transform margin, Norwegian Sea. Marine and Petroleum Geology. ISSN 0264-8172. 122. doi: 10.1016/j.marpetgeo.2020.104717. Full text in Research Archive Show summary

  Transform margins represent strike-slip type of plate boundaries that form during continental breakup and initial ocean opening. They are often characterized by margin-parallel highs with exposed pre- and syn-rift sequences. The Vøring Transform Margin, offshore mid-Norway, initiated in the earliest Eocene during the opening of the NE Atlantic. Here, 2D seismic reflection data reveal a transform margin high, the Mímir High. The western flank of this undrilled structure is a kilometer-high escarpment where seismic reflections of pre-breakup age are truncated at the seafloor. The aim of this study was to recover seabed rock samples from the outcropping or shallowly buried sedimentary sequences to provide a geological tie to the regional seismic framework, thereby constraining the basin history and tectono-stratigraphic development. Seabed samples were successfully collected from 14 gravity core and Selcore stations and 10 ROV (remotely operated vehicle) sites along a 750 m high sampling profile, recovering clay, shales, sandstones and glacial dropstones. Biostratigraphy results revealed that the ages of the sedimentary rocks follow the stratigraphic order predicted by the initial seismic interpretation, with Upper Cretaceous sediments at the base and lower Eocene sediments at the top. The integrated interpretation shows that the Mímir High area, including parts of the outer Vøring and Møre basins and the proto-Jan Mayen Microplate Complex, were characterized by the deposition of late Campanian to early Maastrichtian, near coastal and shale-dominated sequences with poor source rock qualities. The early Paleocene samples indicate deep marine conditions that abruptly ended by rapid uplift of the Mímir High in the earliest Eocene. Finally, a reworked Pliensbachian palynomorph assemblage in potential early Eocene strata indicate the presence of exposed Mesozoic sequences in the vicinity of the Mímir High. We argue that some of the lower Eocene sediments where deposited within a hypothetical drainage system sourced from Greenland (Traill Ø or Jameson Land) and/or from the Jan Mayen Ridge prior to continental separation, and not the result of recent ice-rafting.

• Stokke, Ella Wulfsberg; Jones, Morgan Thomas; Tierney, Jessica; Svensen, Henrik & Whiteside, Jessica H. (2020). Temperature changes across the Paleocene-Eocene Thermal Maximum – a new high-resolution TEX86 temperature record from the Eastern North Sea Basin. Earth and Planetary Science Letters. ISSN 0012-821X. 544. doi: 10.1016/j.epsl.2020.116388. Full text in Research Archive
• Augland, Lars Eivind; Ryabov, Viktor V.; Vernikovsky, Valery A.; Planke, Sverre; Polozov, Alexander & Callegaro, Sara [Show all 8 contributors for this article] (2019). The main pulse of the Siberian Traps expanded in size and composition. Scientific Reports. ISSN 2045-2322. 9. doi: 10.1038/s41598-019-54023-2. Full text in Research Archive
• Svensen, Henrik; Bjærke, Marit Ruge & Kverndokk, Kyrre (2019). The Past as a Mirror: Deep Time Climate Change Exemplarity in the Anthropocene. Culture Unbound. Journal of Current Cultural Research. ISSN 2000-1525. 11(3-4), p. 330–352. doi: 10.3384/cu.2000.1525.1909301. Full text in Research Archive
• Ballo, Eirik Magnus Gottschalk; Augland, Lars Eivind; Hammer, Øyvind & Svensen, Henrik (2019). A new age model for the Ordovician (Sandbian) K-bentonites in Oslo, Norway. Palaeogeography, Palaeoclimatology, Palaeoecology. ISSN 0031-0182. 520, p. 203–213. doi: 10.1016/j.palaeo.2019.01.016. Full text in Research Archive
• Svensen, Henrik; Jerram, Dougal Alexander; Polozov, Alexander; Planke, Sverre; Neal, Clive R. & Augland, Lars Eivind [Show all 7 contributors for this article] (2019). Thinking about LIPs: A brief history of ideas in Large igneous province research. Tectonophysics. ISSN 0040-1951. 760, p. 229–251. doi: 10.1016/j.tecto.2018.12.008. Full text in Research Archive
• Jones, Morgan Thomas; Percival, Lawrence; Stokke, Ella Wulfsberg; Frieling, Joost; Mather, Tasmin A. & Riber, Lars [Show all 11 contributors for this article] (2019). Mercury anomalies across the Palaeocene–Eocene Thermal Maximum. Climate of the Past. ISSN 1814-9324. 15(1), p. 217–236. doi: 10.5194/cp-15-217-2019. Full text in Research Archive
• Heimdal, Thea Hatlen; Callegaro, Sara; Svensen, Henrik; Jones, Morgan Thomas; Pereira, Egberto & Planke, Sverre (2019). Evidence for magma–evaporite interactions during the emplacement of the Central Atlantic Magmatic Province (CAMP) in Brazil. Earth and Planetary Science Letters. ISSN 0012-821X. 506, p. 476–492. doi: 10.1016/j.epsl.2018.11.018.
• Svensen, Henrik; Frolov, Sergei; G., Akhmanov; Polozov, Alexander; Jerram, Dougal Alexander & Shiganova, O. [Show all 9 contributors for this article] (2018). Sills and gas generation in the Siberian Traps. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences. ISSN 1364-503X. 376(2130). doi: 10.1098/rsta.2017.0080.
• Iyer, Karthik; Svensen, Henrik & Schmid, Daniel Walter (2018). SILLi 1.0: a 1-D numerical tool quantifying the thermal effects of sill intrusions. Geoscientific Model Development. ISSN 1991-959X. 11(1), p. 43–60. doi: 10.5194/gmd-11-43-2018. Full text in Research Archive
• Svensen, Henrik; Iyer, Karthik Herman; Schmid, Daniel Walter & Mazzini, Adriano (2018). Modelling of gas generation following emplacement of an igneous sill below Lusi, East Java, Indonesia. Marine and Petroleum Geology. ISSN 0264-8172. 90, p. 201–208. doi: 10.1016/j.marpetgeo.2017.07.007.
• Heimdal, Thea Hatlen; Svensen, Henrik; Ramezani, Jahandar; Iyer, Karthik Herman; Pereira, Egberto & Rodrigues, René [Show all 8 contributors for this article] (2018). Large-scale sill emplacement in Brazil as a trigger for the end-Triassic crisis. Scientific Reports. ISSN 2045-2322. 8. doi: 10.1038/s41598-017-18629-8. Full text in Research Archive

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• Svensen, Henrik; Græsli, Hans; Aga Schioldborg, Alexandra & Schanz, Kristin (2020). Kompass. Gyldendal Undervisning. ISBN 9788205524521. 271 p.
• Svensen, Henrik (2020). Under asfalten. Oslos naturhistorie gjennom to milliarder år. Kagge Forlag AS. ISBN 9788248926399. 251 p.
• Svensen, Henrik (2018). Stein på stein. På sporet av den største masseutryddelsen i jordens historie. Aschehoug & Co. ISBN 978-82-03-29446-4. 239 p.

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• Callegaro, Sara; Svensen, Henrik Hovland; Jerram, Dougal Alexander; Neumann, Else Ragnhild; Deegan, Frances M. & Polozov, Alexander [Show all 7 contributors for this article] (2021). Geochemistry of low-Ti Siberian Traps sills from the Tunguska Basin bears evidence of magma-crust interaction.
• Zuchuat, Valentin; Augland, Lars Eivind; Jones, Morgan Thomas; Twitchett, Richard; Rodríguez-Tovar, Francisco J. & Hammer, Øyvind [Show all 11 contributors for this article] (2021). Facies changes, volcanism, and mass extinction conundrum: the Permian-Triassic boundary across the Barents Sea Shelf. Show summary

  The most dramatic mass extinction the Earth has ever experienced occurred 252 million years ago, at the end of the Permian. It was likely triggered by the volcanic eruptions and magmatic intrusions associated with the Siberian Traps Large Igneous Province (LIP), leading to dramatic climatic changes, with consequences lasting well into the Early Triassic. Here, we present a summary of the findings from the study of several sedimentary successions distributed across the Barents Sea that spanned the End Permian Mass Extinction (EPME) and the Permian-Triassic boundary. The four studied successions included the renowned Festningen section in the outer part of Isfjorden, western Spitsbergen; the DD-1 core and the associated river section in Deltadalen, central Spitsbergen; a core drilled offshore Kvitøya in northern Svalbard, and a core drilled on the Horda Platform in the Barents Sea. Datasets of various research lines were collected from these sections including sedimentology, organic geochemistry, isotope, geochronology, XRF, mineralogy, ichnology, palaeontology, palynology and digital outcrop data. Historically, the Permian-Triassic boundary exposed today in Svalbard (and at various places across the High Arctic regions) was placed at the very prominent and abrupt facies change occurring between the siliceous mudstones or spiculites of the Kapp Starostin Formation, and the overlying soft, non-siliceous mudstones and siltstones of the Vardebukta and Vikinghøgda formations. The abruptness of this facies change, which also marks the demise of sponges, led to the belief that it represented a hiatus or a gap of several million years, with the uppermost Permian strata missing from the sedimentary record, while the mudstones of the Vardebukta and Vikinghøgda formations were definitely of Lower Triassic age, based on ammonoid biostratigraphy. Hindeodus parvus, the conodont that defines the base of the Triassic, was for the first time identified in Svalbard a few meters above the lithostratigraphic boundary, which is therefore of Upper Permian age. Additionally, our new data show that sedimentation was continuous across this lithostratigraphic boundary. This transition from the Kapp Starostin Formation to the Vardebukta and Vikinghøgda formations was accompanied by a major reorganisation/inversion of the basin(s), but its exact nature remains puzzling. Further, all measured sections record the EPME, which is associated with a 6-8 ‰ δ13CVPDB negative excursion, and measured between the lithostratigraphic and the Permian-Triassic boundaries. These negative isotopic excursions are found in close vicinity to several tephra layers that have been precisely dated at 252.13 ± 0.62 Ma, strongly suggesting a connection to the Siberian Traps LIP event. The mass extinction is also confirmed by the very rapid decreasing of trace fossil abundance and diversity, as anoxia spread across the water from proximal and shallow water to deeper settings. Geochemical and ichnological data indicate the occurrence of several anoxic pulses, intersected by very brief episodes of improved oxygenation levels. It took ca. 145 Kyr for life to recover after the extinction event, based on sedimentation rate calculations. Data also suggest that a shift towards more arid climatic conditions and increased eutrophication on land accompanied the EPME.

• Planke, Sverre; Polozov, Alexander; Millett, John M; Jerram, Dougal Alexander; Zastrozhnov, Dmitrii & Svensen, Henrik (2020). Emergent and invasive magmatism of the Siberian Traps in a wet forest environment. NGF abstracts and proceedings.
• Svensen, Henrik & Müller, Reidar (2020). Under asfalten – Oslo lag for lag. Henrik Svensen i samtale Reidar Müller.
• Svensen, Henrik (2020). Bli med under asfalten i Oslo.
• Svensen, Henrik (2020). Oslos geologiske historie - en serie i tre deler i Ekko, NRK P2. [Radio]. NRK P2 Ekko.
• Heimdal, Thea Hatlen; Jones, Morgan Thomas; Svensen, Henrik & Callegaro, Sara (2020). The Central Atlantic Magmatic Province (CAMP) and the end-Triassic crisis.
• Jones, Morgan Thomas; Stokke, Ella Wulfsberg; Augland, Lars Eivind; Svensen, Henrik; Pogge von Strandmann, Philip A.E. & Rooney, Alan (2020). Constraining the activity of the North Atlantic Igneous Province across the Paleocene-Eocene boundary.
• Jones, Morgan Thomas; Stokke, Ella Wulfsberg; Augland, Lars Eivind; Pogge von Strandmann, Philip A.E.; Liu, Emma J. & Mather, Tamsin [Show all 13 contributors for this article] (2020). Constraining North Atlantic Igneous Province (NAIP) activity during the late Paleocene and early Eocene.
• Torsvik, Trond Helge; Svensen, Henrik; Steinberger, Bernhard; Royer, Dana L.; Jerram, Dougal Alexander & Jones, Morgan Thomas [Show all 7 contributors for this article] (2020). Connecting the Deep Earth and the Atmosphere.
• Svensen, Henrik (2020). Guide til Oslos geologiske skatter. [Internet]. Titan, UiO.
• Svensen, Henrik (2020). Dro på jakt etter vulkaner. [Newspaper]. Aftenposten Junior.
• Svensen, Henrik (2020). Oslos lange geologiske historie. [Radio]. NRK P2 Studio 2.
• Svensen, Henrik (2020). Ny bok om Oslos geologiske historie. [Radio]. NRK Østlandssendingen.
• Svensen, Henrik (2020). Lansering av Under asfalten, bokbad.
• Svensen, Henrik (2020). Om Oslos geologiske historie.
• Svensen, Henrik (2020). Denne steinen på Ekebergsletta er viktigere enn du tror. [Newspaper]. Aftenposten.
• Svensen, Henrik (2020). Oppdagelsen av Jotunfjeldene – når geologi blir kunst. [Internet]. plnty.
• Stokke, Ella Wulfsberg; Jones, Morgan Thomas; Tierney, Jessica E.; Riber, Lars; Svensen, Henrik & Whiteside, Jessica H. (2020). Volcanic cooling followed by a warm and wet Paleocene-Eocene Thermal Maximum in Denmark.
• Bajard, Manon Julietto Andree; Ballo, Eirik Magnus Gottschalk; Støren, Eivind Wilhelm Nagel; Bakke, Jostein; Høeg, Helge Irgens & Loftsgarden, Kjetil [Show all 9 contributors for this article] (2020). Tracing socio-environmental dynamics and climate changes in the period 300-1300 CE in Scandinavia from lake sediments.
• Åmli, Hanne; Fossen, Haakon & Svensen, Henrik (2020). Meta Morhp.
• Svensen, Henrik (2019). Menneskets fotavtrykk. Morgenbladet. ISSN 0805-3847.
• Jones, Morgan Thomas; Stokke, Ella Wulfsberg; Pogge von Strandmann, Philip A.E.; Augland, Lars Eivind; Svensen, Henrik & Whiteside, Jessica H. [Show all 7 contributors for this article] (2019). ASHLANTIC: A multi-proxy approach to understanding the relationship between the NAIP and the PETM.
• Svensen, Henrik (2019). Å skrive for livet: populærvitenskap, forskermemoarer og IMRAD. In Jørgensen, Iben Brinch & Askeland, Norunn (Ed.), Kreativ akademisk skriving. Universitetsforlaget. ISSN 9788215031620. p. 157–178.
• Svensen, Henrik (2019). Masseutryddelsene: Da livet nesten ble utslettet.
• Gaina, Carmen; Mac Niocaill, Conall; Conrad, Clinton Phillips; Steinberger, Bernhard & Svensen, Henrik (2019). Linking plate tectonics and volcanism to deep earth dynamics - A tribute to Trond H. Torsvik. Tectonophysics. ISSN 0040-1951. 760, p. 1–3. doi: 10.1016/j.tecto.2019.03.002.
• Svensen, Henrik (2019). Går det til helvete?
• Svensen, Henrik (2019). Panelsamtale: «Derfor skriver og gir vi ut popvit-bøker. Men hvem leser?», med Jorunn Sandsmark, Johan Tønnesson, Sverre Gunnar Haga og Henrik Svensen.
• Svensen, Henrik (2019). Jessica Lönn-Stensrud i samtale med Henrik Svensen: «Vi må snakke om bakterier. En samtale om bøker og bakterier» (boklansering).
• Svensen, Henrik (2019). Dyp tid, klimaendringer og eksemplaritet.
• Jones, Morgan Thomas; Stokke, Ella Wulfsberg; Pogge von Stradmann, Philip; Augland, Lars Eivind; Svensen, Henrik & Whiteside, Jessica H. [Show all 7 contributors for this article] (2019). Ashlantic: A multi-proxy approach to understanding the relationship between the North Atlantic Igneous Province and the Paleocene-Eocene Thermal Maximum.
• Ballo, Eirik Magnus Gottschalk; Bajard, Manon Julietto Andree; Støren, Eivind Wilhelm Nagel; Bakke, Jostein & Svensen, Henrik (2019). High-resolution lacustrine records of environmental changes in Scandinavia: a focus on the Migration period and Viking age.
• Ballo, Eirik Magnus Gottschalk; Bajard, Manon Julietto Andree; Støren, Eivind Wilhelm Nagel; Bakke, Jostein & Svensen, Henrik (2019). High-resolution lacustrine records of environmental changes in Scandinavia: a focus on the Migration period and Viking age.
• Ballo, Eirik Magnus Gottschalk; Bajard, Manon Julietto Andree; Støren, Eivind Wilhelm Nagel; Bakke, Jostein & Svensen, Henrik (2019). High-resolution lacustrine records of environmental changes in Scandinavia: a focus on the Migration period and Viking age.
• Ballo, Eirik Magnus Gottschalk; Bajard, Manon Julietto Andree; Støren, Eivind Wilhelm Nagel; Bakke, Jostein & Svensen, Henrik (2019). High-resolution lacustrine records of environmental changes in Scandinavia: a focus on the Migration period and the Viking age.
• Bajard, Manon Julietto Andree; Støren, Eivind Wilhelm Nagel; Bakke, Jostein & Svensen, Henrik (2019). High-resolution lacustrine records of environmental changes in Scandinavia: a focus on the Migration period and Viking age.
• Bostic, Joshua Neilson; Hagopian, William Martin; Svensen, Henrik & Jahren, Anne Hope (2019). Predicting seasonal climate using intra-ring stable isotope analysis. Show summary

  By emitting stratospheric sulphur aerosol clouds that dim the light-energy received from the sun, large-scale volcanic eruptions may cause acute changes in global climate that impact both natural ecosystems and human societies. One example is the 536 Event, a prolonged period of darkness and cooling across the northern hemisphere caused by two separate volcanic eruptions in 536 and 540 CE. Recent mean annual temperature (MAT) and mean annual precipitation (MAP) reconstructions suggest that the decade following the 536 event was one of the coldest and wettest of the past two millennia. This cold period likely contributed to the cultural upheavals that occurred in Scandinavia during the 6th century by reducing the geographic range suitable for cereal grain production. However, while annually-resolved MAT and MAP reconstructions are useful for identifying climatic perturbations, they provide limited insight into the effects of such climate anomalies on regional agricultural productivity due to their limited ability to differentiate summer and winter climatic conditions. To accurately estimate the number of days suitable for growing crops, or Growing Degree Days (GDD), seasonal resolution must be achieved by determining the ratio of summer to winter temperature and precipitation. To reconstruct growing season temperature and precipitation across southern Scandinavia in the decade following the 536 event (535-545 CE), we will combine prior reconstructions of annual mean data with novel analyses of summer/winter temperature and precipitation ratios derived from intra-ring carbon and oxygen stable isotope analysis of Picea abies collected from Raknehaugen, a burial mound in southern Norway constructed in 551 CE. These growing season temperature and precipitation estimates will be combined with other geo-climatic data (latitude, altitude etc.) for regional GDD reconstruction to ultimately determine changes in the geographic range suitable for crop production in Southern Norway following the 536/540 double event. Here, we 1.) Provide a conceptual outline of the project’s expected outcomes and 2.) Demonstrate the ability of intra-ring stable isotope analysis to detect short-term seasonal climatic perturbations in Scandinavia by reconstructing the European summer drought of 1959 from estimates of summer/winter temperature and precipitation ratios derived from stable isotope patterns in Picea abies samples from two locations in southern Norway.

• Heimdal, Thea Hatlen; Svensen, Henrik; Jones, Morgan Thomas; Callegaro, Sara & Pereira, Egberto (2019). Thermogenic Gas Release from CAMP as a Trigger for the End-Triassic Crisis.
• Jones, Morgan Thomas; Hammer, Øyvind; Bucher, Hugo; Schneebeli-Hermann, Elke; Mather, Tamsin & Svensen, Henrik [Show all 7 contributors for this article] (2019). Are Mercury Anomalies a Reliable Proxy for LIP Volcanism? Examples from the End-Permian and Early Triassic.
• Stokke, Ella Wulfsberg; Whiteside, Jessica H.; Riber, Lars; Haflidason, Haflidi; Tierney, Jessica E & Svensen, Henrik [Show all 7 contributors for this article] (2019). Linking warming, environmental changes, and volcanic ash falls from onset to recovery of the PETM: a multi-proxy study from Fur, Denmark.
• Svensen, Henrik; John, Timm; Weyer, Stefan; Fristad, Kirsten; Polozov, Alexander & Bajard, Manon Julietto Andree [Show all 8 contributors for this article] (2019). Bacterial sulphate- and iron reduction in a Siberian Traps crater lake during the end-Permian crisis .
• Polozov, Alexander; Planke, Sverre; Millett, John; Svensen, Henrik & Jerram, Dougal Alexander (2019). Hybrid rocks formation at onset of the Siberian Traps basalt lavas eruption and shallow intrusions emplacement.
• Svensen, Henrik (2019). Når vulkanen kollapser. Morgenbladet. ISSN 0805-3847.
• Svensen, Henrik (2019). Gruveslam på dypt vann. Morgenbladet. ISSN 0805-3847.
• Svensen, Henrik (2019). Vann. [Radio]. NRK P2 Ekko.
• Svensen, Henrik (2019). Nytt lys over mørk dag. Morgenbladet. ISSN 0805-3847.
• Svensen, Henrik (2018). Finner svar i steinene. [Newspaper]. Klassekampen.
• Svensen, Henrik (2018). Følger sporet av den største masseutryddelsen i jordens historie. [Internet]. ABC nyheter.
• Svensen, Henrik (2018). Den største utryddelsen rykker nærmere. Aftenposten (morgenutg. : trykt utg.). ISSN 0804-3116.
• Svensen, Henrik (2018). Ukas NFFO-er. [Internet]. NFFO nettside.
• Svensen, Henrik (2018). Eldgammel forurensning. Morgenbladet. ISSN 0805-3847.
• Svensen, Henrik (2018). Elver med evig liv. Morgenbladet. ISSN 0805-3847.
• Svensen, Henrik (2018). Asken fra ilden. Morgenbladet. ISSN 0805-3847.
• Svensen, Henrik (2018). Diamanter og gull under havet. Morgenbladet. ISSN 0805-3847.
• Svensen, Henrik (2018). Regn og rasende jord. Morgenbladet. ISSN 0805-3847.
• Svensen, Henrik (2018). Å overleve en tsunami. Morgenbladet. ISSN 0805-3847.
• Svensen, Henrik (2018). Den største masseutryddelsen.
• Svensen, Henrik (2018). Stein på stein, en ny bok. [Radio]. NRK Østfold.
• Svensen, Henrik (2018). Geologien i Slemmestad.
• Svensen, Henrik (2018). Geologien i Spikkestad.
• Svensen, Henrik (2018). Verdens viktigste fagfelt.
• Svensen, Henrik (2018). Menneskets tidsalder.
• Svensen, Henrik (2018). Jordens kriser.
• Svensen, Henrik (2018). Stein på stein.
• Svensen, Henrik (2018). Travels to the end of the world.
• Svensen, Henrik (2018). Tsunamien i Indonesia, 22. desember 2018. [TV]. TV2 nyhetene.
• Svensen, Henrik (2018). Mellom forskning og formidling. [Business/trade/industry journal]. NFFO jubileumsmagasin.
• Svensen, Henrik (2018). Farvel, holocen. En kort naturhistorie for tiden etter siste istid. In Bjerregaard, Peter & Kverndokk, Kyrre (Ed.), Kollaps. På randen av fremtiden.. Dreyer Forlag A/S. ISSN 9788282654234. p. 47–57.
• Delsett, Lene Liebe; Svensen, Henrik; Sletsjøe, Arne Bernhard & Jemterud, Torkild (2018). Abels tårn 23. mars 2018. [Radio]. NRK P2 Ekko.
• Jones, Morgan Thomas; Percival, Lawrence; Stokke, Ella Wulfsberg; Frieling, Joost; Mather, Tamsin & Riber, Lars [Show all 8 contributors for this article] (2018). Investigating mercury as a large igneous province proxy: Insights from the Palaeocene-Eocene Thermal Maximum.
• Svensen, Henrik; Percival, Lawrence; Jones, Morgan Thomas & Mather, Tamsin (2018). Release of mercury from black shale during contact metamorphism and the implications for mercury as a volcanic proxy .
• Stokke, Ella Wulfsberg; Jones, Morgan Thomas; Hammer, Øyvind & Svensen, Henrik (2018). Geochemistry of Paleocene- Eocene sediments on Fur, Denmark: Linking volcanism and climatic changes.
• Svensen, Henrik; Jerram, Dougal Alexander; Polozov, Alexander; Jones, Morgan Thomas; Augland, Lars Eivind & Planke, Sverre (2018). Volcanic causes for the PETM and other past hothouse climates.
• Jones, Morgan Thomas; Stokke, Ella Wulfsberg; Schultz, Bo; Augland, Lars Eivind; Planke, Sverre & Tegner, Christian [Show all 9 contributors for this article] (2018). Fur Island in Denmark: A window into Paleocene-Eocene hyperthermals and North Atlantic volcanism.
• Jerram, Dougal Alexander; Svensen, Henrik; Planke, Sverre; Millett, John M; Jones, Morgan Thomas & Augland, Lars Eivind [Show all 7 contributors for this article] (2018). Types and styles of volcanism in the North Atlantic Igneous Province: Implications towards understanding their potential climatic impact.

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