Christian J. Bjerrum

Search results

• 2025

  Hydrological cycles perturbation of continental weathering during the Triassic-Jurassic transition and Toarcian Oceanic Anoxic Event

  He, Q., Lindström, S., Hesselbo, S., Bjerrum, C. J., Li, M., Ju, J. & Shen, J., 2025, p. 5049. 1 p.

  Research output: Contribution to conference › Conference abstract for conference › Research › peer-review

  Open Access

• The Late Maastrichtian Rørdal Member (Denmark): a remarkable window of climatic, environmental and biotic changes at orbital timescales

  Thibault, N., Lauridsen, B. W., Schovsbo, N. H., Anderskouv, K., Bjerrum, C. J., Korte, C., Martinez, M., Morigi, C., Stemmerik, L. & Ullmann, C. V., 31 Mar 2025, In: Geological Society Special Publication. 545, 1, p. 399-429 31 p.

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access
  1 Citation (Scopus)

• The unicellular NUM v.0.91: A trait-based plankton model evaluated in two contrasting biogeographic provinces

  Hansen, T. F., Canfield, D. E., Andersen, K. H. & Bjerrum, C. J., 2025, In: Geoscientific Model Development. 18, 6, p. 1895-1916 22 p.

  Research output: Contribution to journal › Journal article › Research › peer-review

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• 2024

  Combined cadmium and chromium isotopes record a collapse of bioproductivity across the Cretaceous—Paleogene boundary in the Danish basin

  Frederiksen, J. A., Thibault, N., Gilleaudeau, G. J., Bjerrum, C. J., Moreau, J. & Frei, R., 2024, In: Chemical Geology. 654, 24 p., 122058.

  Research output: Contribution to journal › Journal article › Research › peer-review

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  5 Citations (Scopus)

  12 Downloads (Pure)
• 2023

  Comparing two ocean biogeochemical models of Chesapeake Bay with and without the sulfur cycle instead highlights the importance of particle sinking, burial, organic matter, nitrification and light attenuation

  Jin, R., Pradal, M.-A., Hantsoo, K., Gnanadesikan, A., St-Laurent, P. & Bjerrum, C. J., 2023, In: Ocean Modelling. 182, 15 p., 102175.

  Research output: Contribution to journal › Journal article › Research › peer-review

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  2 Citations (Scopus)

  2 Downloads (Pure)

• Constructing a model including the cryptic sulfur cycle in Chesapeake Bay requires judicious choices for key processes and parameters

  Jin, R., Pradal, M.-A., Hantsoo, K., Gnanadesikan, A., St-Laurent, P. & Bjerrum, C. J., 2023, In: MethodsX. 11, 18 p., 102253.

  Research output: Contribution to journal › Journal article › Research › peer-review

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• Initial results of coring at Prees, Cheshire Basin, UK (ICDP JET project): Towards an integrated stratigraphy, timescale, and Earth system understanding for the Early Jurassic

  Hesselbo, S. P., Al-Suwaidi, A., Baker, S. J., Ballabio, G., Belcher, C. M., Bond, A., Boomer, I., Bos, R., Bjerrum, C. J., Bogus, K., Boyle, R., Browning, J. V., Butcher, A. R., Condon, D. J., Copestake, P., Daines, S., Dalby, C., Damaschke, M., Damborenea, S. E. & Deconinck, J. F. & 53 others, Dickson, A. J., Fendley, I. M., Fox, C. P., Fraguas, A., Frieling, J., Gibson, T. A., He, T., Hickey, K., Hinnov, L. A., Hollaar, T. P., Huang, C., Hudson, A. J. L., Jenkyns, H. C., Idiz, E., Jiang, M., Krijgsman, W., Korte, C., Leng, M. J., Lenton, T. M., Leu, K., Little, C. T. S., Macniocaill, C., Manceñido, M. O., Mather, T. A., Mattioli, E., Miller, K. G., Newton, R. J., Page, K. N., Pálfy, J., Pieńkowski, G., Porter, R. J., Poulton, S. W., Riccardi, A. C., Riding, J. B., Roper, A., Ruhl, M., Silva, R. L., Storm, M. S., Suan, G., Szúcs, D., Thibault, N., Uchman, A., Stanley, J. N., Ullmann, C. V., Van De Schootbrugge, B., Vickers, M. L., Wadas, S., Whiteside, J. H., Wignall, P. B., Wonik, T., Xu, W., Zeeden, C. & Zhao, K., 2023, In: Scientific Drilling. 32, p. 1-25 25 p.

  Research output: Contribution to journal › Journal article › Research › peer-review

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  6 Citations (Scopus)

  29 Downloads (Pure)

• Late Jurassic – Early Cretaceous marine deoxygenation in NE Greenland

  Hovikoski, J., Olivarius, M., Bojesen-Koefoed, J. A., Piasecki, S., Alsen, P., Fyhn, M. B. W., Sharp, I., Bjerager, M., Vosgerau, H., Lindström, S., Bjerrum, C. & Ineson, J., 2023, In: Journal of the Geological Society. 180, 3, 16 p., jgs2022-058.

  Research output: Contribution to journal › Journal article › Research › peer-review

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  9 Citations (Scopus)

  28 Downloads (Pure)

• Widespread seafloor anoxia during generation of the Ediacaran Shuram carbon isotope excursion

  Ostrander, C. M., Bjerrum, C. J., Ahm, A. S. C., Stenger, S. R., Bergmann, K. D., El-Ghali, M. A. K., Harthi, A. R., Aisri, Z. & Nielsen, S. G., 2023, In: Geobiology. 21, 5, p. 556-570

  Research output: Contribution to journal › Journal article › Research › peer-review

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  13 Citations (Scopus)

  5 Downloads (Pure)
• 2022

  Late Triassic paleowinds from lacustrine wave ripple marks in the Fleming Fjord Group, central East Greenland

  Mau, M., Bjerrum, C. J. & Clemmensen, L. B., 2022, In: Palaeogeography, Palaeoclimatology, Palaeoecology. 586, 11 p., 110776.

  Research output: Contribution to journal › Journal article › Research › peer-review

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  4 Citations (Scopus)

  45 Downloads (Pure)
• 2021

  Minimum levels of atmospheric oxygen from fossil tree roots imply new plant−oxygen feedback

  Sønderholm, F. & Bjerrum, C. J., 2021, In: Geobiology. 19, 3, p. 250-260 11 p.

  Research output: Contribution to journal › Journal article › Research › peer-review

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  7 Citations (Scopus)

  41 Downloads (Pure)

• Petrographic carbon in ancient sediments constrains Proterozoic Era atmospheric oxygen levels

  Canfield, D. E., van Zuilen, M. A., Nabhan, S., Bjerrum, C. J., Zhang, S., Wang, H. & Wang, X., 2021, In: Proceedings of the National Academy of Sciences of the United States of America. 118, 23, 8 p., 2101544118.

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access
  41 Citations (Scopus)

• Redox element record shows that environmental perturbations associated with the t-oae were of longer duration than the carbon isotope record suggests – the aubach section, sw germany

  Hougård, I. W., Bojesen-Koefoed, J. A., Vickers, M. L., Ullmann, C. V., Bjerrum, C. J., Rizzi, M. & Korte, C., 2021, In: Newsletters on Stratigraphy. 54, 2, p. 229-246

  Research output: Contribution to journal › Journal article › Research › peer-review

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  14 Citations (Scopus)

  38 Downloads (Pure)

• The Ca and Mg isotope record of the Cryogenian Trezona carbon isotope excursion

  Ahm, A. S. C., Bjerrum, C. J., Hoffman, P. F., Macdonald, F. A., Maloof, A. C., Rose, C. V., Strauss, J. V. & Higgins, J. A., 15 Aug 2021, In: Earth and Planetary Science Letters. 568, 13 p., 117002.

  Research output: Contribution to journal › Journal article › Research › peer-review

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  33 Citations (Scopus)

  26 Downloads (Pure)
• 2020

  Cold spells in the Nordic Seas during the early Eocene Greenhouse

  Vickers, M. L., Lengger, S. K., Bernasconi, S. M., Thibault, N., Schultz, B. P., Fernandez, A., Ullmann, C. V., McCormack, P., Bjerrum, C. J., Rasmussen, J. A., Hougård, I. W. & Korte, C., 2020, In: Nature Communications. 11, 1, 12 p., 4713.

  Research output: Contribution to journal › Journal article › Research › peer-review

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  29 Citations (Scopus)

  44 Downloads (Pure)

• Development of Iron Speciation Reference Materials for Palaeoredox Analysis

  Alcott, L. J., Krause, A. J., Hammarlund, E. U., Bjerrum, C. J., Scholz, F., Xiong, Y., Hobson, A. J., Neve, L., Mills, B. J. W., Marz, C., Schnetger, B., Bekker, A. & Poulton, S. W., 2020, In: Geostandards and Geoanalytical Research. 44, 3, p. 581-591 11 p.

  Research output: Contribution to journal › Journal article › Research › peer-review

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  51 Citations (Scopus)

  26 Downloads (Pure)

• Stratigraphically controlled silicification in Danian chalk and its implications for reservoir properties, southern Danish Central Graben

  Blinkenberg, K. H., Anderskouv, K., Sheldon, E., Bjerrum, C. J. & Stemmerik, L., 2020, In: Marine and Petroleum Geology. 115, 15 p., 104134.

  Research output: Contribution to journal › Journal article › Research › peer-review
  10 Citations (Scopus)

• The modern phosphorus cycle informs interpretations of Mesoproterozoic Era phosphorus dynamics

  Canfield, D. E., Bjerrum, C. J., Zhang, S., Wang, H. & Wang, X., Sept 2020, In: Earth-Science Reviews. 208, 24 p., 103267.

  Research output: Contribution to journal › Review › peer-review
  48 Citations (Scopus)
• 2019

  An early diagenetic deglacial origin for basal Ediacaran “cap dolostones”

  Ahm, A. S. C., Maloof, A. C., Macdonald, F. A., Hoffman, P. F., Bjerrum, C. J., Bold, U., Rose, C. V., Strauss, J. V. & Higgins, J. A., 2019, In: Earth and Planetary Science Letters. 506, p. 292-307 16 p.

  Research output: Contribution to journal › Journal article › Research › peer-review

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  78 Citations (Scopus)

  64 Downloads (Pure)

• Paleoenvironmental proxies and what the Xiamaling Formation tells us about the mid-Proterozoic ocean

  Zhang, S., Wang, X., Wang, H., Bjerrum, C. J., Hammarlund, E. U., Haxen, E. R., Wen, H., Ye, Y. & Canfield, D. E., 2019, In: Geobiology. 17, 3, p. 225-246 22 p.

  Research output: Contribution to journal › Journal article › Research › peer-review

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  50 Citations (Scopus)

  284 Downloads (Pure)
• 2018

  A mesoproterozoic iron formation

  Canfield, D. E., Zhang, S., Wang, H., Wang, X., Zhao, W., Su, J., Bjerrum, C. J., Haxen, E. R. & Hammarlund, E. U., 24 Apr 2018, In: Proceedings of the National Academy of Sciences of the United States of America. 115, 17, p. E3895-E3904 10 p.

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access
  82 Citations (Scopus)

• Bioturbation and directionality in Earth's carbon isotope record across the Neoproterozoic-Cambrian transition

  Boyle, R. A., Dahl, T. W., Bjerrum, C. J. & Canfield, D. E., May 2018, In: Geobiology. 16, 3, p. 252-278 27 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  33 Citations (Scopus)

• Quantifying early marine diagenesis in shallow-water carbonate sediments

  Ahm, A.-S. C., Bjerrum, C. J., Blattler, C. L., Swart, P. K. & Higgins, J. A., 2018, In: Geochimica et Cosmochimica Acta. 236, p. 140-159 20 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  210 Citations (Scopus)

• Sea level, climate, and ocean poisoning by sulfide all implicated in the first animal mass extinction

  Bjerrum, C. J., 1 Jun 2018, In: Geology. 46, 6, p. 575-576 2 p.

  Research output: Contribution to journal › Editorial › Research › peer-review
  3 Citations (Scopus)
• 2017

  A new correlation of Triassic-Jurassic boundary successions in NW Europe, Nevada and Peru, and the Central Atlantic Magmatic Province: A time-line for the end-Triassic mass extinction

  Lindström, S., van de Schootbrugge, B., Hansen, K. H., Pedersen, G. K., Alsen, P., Thibault, N. R., Dybkjaer, K., Bjerrum, C. J. & Nielsen, L. H., 2017, In: Palaeogeography, Palaeoclimatology, Palaeoecology - An International Journal for the Geo-Sciences. 478, p. 80-102 23 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  109 Citations (Scopus)

• Disentangling the record of diagenesis, local redox conditions, and global seawater chemistry during the latest Ordovician glaciation

  Ahm, A.-S. C., Bjerrum, C. J. & Hammarlund, E. U., 2017, In: Earth and Planetary Science Letters. 459, p. 145-156 12 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  70 Citations (Scopus)

• Oxygen, climate and the chemical evolution of a 1400 million year old tropical marine setting

  Wang, X., Zhang, S., Wang, H., Bjerrum, C. J., Hammarlund, E. U., Haxen, E. R., Su, J., Wang, Y. & Canfield, D. E., 2017, In: American Journal of Science. 317, 8, p. 861-900 40 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  89 Citations (Scopus)
• 2016

  En krise i livets historie: masseuddøen og samtidig vulkanisme ved Trias–Jura-grænsen

  Translated title of the contribution: A crisis in life's history (a popular science paper on the end-Triassic event in the Danish Basin - In Danish)Lindström, S., Pedersen, G. K., Dybkjær, K., Weibel, R., Nielsen, L. H., Nytoft, H.-P., Hansen, K. H., Thibault, N. R., Bjerrum, C. J., Korte, C., Waight, T. E. & Tegner, C., 2016, In: Geoviden. 2016, 1, p. 2-20

  Research output: Contribution to journal › Journal article › Communication

• Orbital calibration of the late Campanian carbon isotope event in the North Sea

  Perdiou, A., Thibault, N. R., Anderskouv, K., van Buchem, F., Buijs, G. J. A. & Bjerrum, C. J., 2016, In: Journal of the Geological Society. 173, 3, p. 504-517 14 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  17 Citations (Scopus)

• Reply to Planavsky et al.: Strong evidence for high atmospheric oxygen levels 1,400 million years ago

  Zhang, S., Wang, X., Wang, H., Bjerrum, C. J., Hammarlund, E. U., Dahl, T. W. & Canfield, D. E., 2016, In: National Academy of Sciences. Proceedings. 113, 19, p. E2552-E2553 2 p.

  Research output: Contribution to journal › Comment/debate › Research › peer-review
  15 Citations (Scopus)

• Sufficient oxygen for animal respiration 1,400 million years ago

  Zhang, S., Wang, X., Wang, H., Bjerrum, C. J., Hammarlund, E. U., Canas Portela Costa, M. M., Connelly, J., Zhang, B., Su, J. & Canfield, D. E., 16 Feb 2016, In: National Academy of Sciences. Proceedings. 113, 7, p. 1731-1736 6 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  322 Citations (Scopus)
• 2015

  CA AND MG ISOTOPE RECORD OF THE DESCENT AND ESCAPE OF THE END-CRYOGENIAN GLACIATION

  Ahm, A.-S. C., Bjerrum, C. J., Hoffman, P., Macdonald, F., Maloof, A., Rose, C. & Higgins, J., 2015. 1 p.

  Research output: Contribution to conference › Conference abstract for conference › Research › peer-review

• Ca and Mg Isotope Stratigraphy of the Trezona C Isotope Excursion: Geochemical Record of the Descent into a Snowball?

  Ahm, A.-S. C., Bjerrum, C. J., Hoffman, P., Macdonald, F., Maloof, A., Rose, C. & Higgins, J., 2015.

  Research output: Contribution to conference › Conference abstract for conference › Research › peer-review

• Iron oxides, divalent cations, silica, and the early earth phosphorus crisis

  Jones, C., Nomosatryo, S., Crowe, S. A., Bjerrum, C. J. & Canfield, D. E., 2015, In: Geology. 43, 2, p. 135-138

  Research output: Contribution to journal › Journal article › Research › peer-review
  188 Citations (Scopus)

• Orbital forcing of climate 1.4 billion years ago

  Zhang, S., Wang, X., Hammarlund, E. U., Wang, H., Canas Portela Costa, M. M., Bjerrum, C. J., Connelly, J., Zhang, B., Bian, L. & Canfield, D. E., 2015, In: Proceedings of the National Academy of Sciences of the United States of America. 112, 12, p. E1406-E1413 8 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  179 Citations (Scopus)
• 2014

  A model-based insight into the coupling of nitrogen and sulfur cycles in a coastal upwelling system

  Muchamad, A. A., Canfield, D. E., Fennel, K., Thamdrup, B. & Bjerrum, C. J., 2014, In: Journal of Geophysical Research: Biogeosciences. 119, 3, p. 264-285 22 p.

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access

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  23 Citations (Scopus)

  607 Downloads (Pure)

• Arctic black shale formation during Cretaceous Oceanic Anoxic Event 2

  Lenniger, M., Nøhr-Hansen, H., Hills, L. V. & Bjerrum, C. J., 1 Sept 2014, In: Geology. 42, 9, p. 799-802 4 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  49 Citations (Scopus)

• The link between the rise of land plants, cloud-albedo, and carbon cycle perturbation

  Ahm, A.-S. C. & Bjerrum, C. J., 2014. 1 p.

  Research output: Contribution to conference › Conference abstract for conference › Research › peer-review
• 2013

  Carbon-isotope stratigraphy from terrestrial organic matter through the Monterey event, Miocene, New Jersey margin (IODP Expedition 313)

  Fang, L., Bjerrum, C. J., Hesselbo, S. P., Kotthoff, U., McCarthy, F. M. G., Huang, B. & Ditchfield, P. W., 1 Oct 2013, In: Geosphere. 9, 5, p. 1303-1318 16 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  11 Citations (Scopus)

• Large Igneous Province volcanism, ocean anoxia and marine mass extinction

  Ruhl, M., Bjerrum, C. J., Canfield, D., Korte, C., Stemmerik, L. & Frei, R., 2013, In: Mineralogical Magazine. 77, 5, p. 2097 1 p.

  Research output: Contribution to journal › Conference abstract in journal › Research

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• Mochras borehole revisited: a new global standard for Early Jurassic earth history

  The Mochras Revisited Science Team, 2013, In: Scientific Drilling. 16, p. 81-91 11 p.

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access

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  33 Citations (Scopus)

  1524 Downloads (Pure)

• Ocean anoxia and large igneous provinces

  Ruhl, M., Bjerrum, C. J., Canfield, D. E., Korte, C., Stemmerik, L. & Frei, R., 2013, In: Geophysical Research Abstracts. 15, 1 p.

  Research output: Contribution to journal › Conference abstract in journal › Research

  Open Access

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  45 Downloads (Pure)

• Ocean oxygenation and nutrification in relation Phanerozoic climate evolution

  Bjerrum, C. J., 2013. 2 p.

  Research output: Contribution to conference › Paper › Research

  Open Access

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  801 Downloads (Pure)

• Ocean redox change at the Permian-Triassic mass extinction

  Ruhl, M., Bjerrum, C. J., Canfield, D. E. & Stemmerik, L., 2013, The Permian Strata of Svalbard: Norwegian Polar institute, Tromsø, april 10-12, 2013 Abstracts and Proceedings. Bond, D. & Blomeier, D. (eds.). Norwegian Polar Institute (NPI), p. 20-21 2 p.

  Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

• Paleoredox chemistry of Cenomanian–Coniacian black shales at high paleolatitudes: Implications for the extent of anoxia during OAE2

  Lenniger, M., Nøhr-Hansen, H., Hills, L. V. & Bjerrum, C. J., 2013, In: Mineralogical Magazine. 77, 5, p. 1585 1 p.

  Research output: Contribution to journal › Conference abstract in journal › Research

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  1213 Downloads (Pure)

• Regional deep water anoxic conditions during the Hirnantian extinction event

  Ahm, A.-S. C., Bjerrum, C. J. & Hammarlund, E., 2013, In: Mineralogical Magazine. 77, 3, p. 563 1 p.

  Research output: Contribution to journal › Conference abstract in journal › Research

  Open Access

• Statistical classification of log response as an indicator of facies variation during changes in sea level: integrated Ocean Drilling Program Expedition 313

  Inwood, J., Lofi, J., Davies, S., Basile, C., Bjerrum, C., Mountain, G., Proust, J.-N., Otsuka, H. & Valppu, H., 2013, In: Geosphere. 9, 4, p. 1025-1043 19 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  14 Citations (Scopus)

• Testing sequence stratigraphic models by drilling Miocene foresets on the New Jersey shallow shelf

  Miller, K. G., Mountain, G. S., Browning, J. V., Katz, M. E., Monteverde, D., Sugarman, P. J., Ando, H., Bassetti, M. A., Bjerrum, C. J., Hodgson, D., Hesselbo, S., Karakaya, S., Proust, J.-N. & Rabineau, M., 1 Oct 2013, In: Geosphere. 9, 5, p. 1236-1256 21 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  44 Citations (Scopus)

• Tracing euxinia by molybdenum concentrations in sediments using handheld X-ray fluorescence spectroscopy (HHXRF)

  Dahl, T. W., Ruhl, M., Hammarlund, E. U., Canfield, D. E., Rosing, M. T. & Bjerrum, C. J., 18 Dec 2013, In: Chemical Geology. 360-361, p. 241-251 11 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  83 Citations (Scopus)
• 2012

  A sulfidic driver for the end-Ordovician mass extinction

  Hammarlund, E., Dahl, T. W., Harper, D. A. T., Bond, D. P. G., Nielsen, A. T., Bjerrum, C. J., Schovsbo, N. H., Schönlaub, H. P., Zalasiewicz, J. A. & Canfield, D. E., 2012, In: Earth and Planetary Science Letters. 331-332, p. 128-139 12 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  197 Citations (Scopus)