Browsing Bergen Open Research Archive by Author "Ninnemann, Ulysses S"

Now showing items 1-9 of 9

    • Asynchronous Antarctic and Greenland ice-volume contributions to the last interglacial sea-level highstand 

      Rohling, E.J.; Hibbert, F.D.; Grant, K.M.; Galaasen, Eirik Vinje; Irvali, Nil; Kleiven, Helga Flesche; Marino, G.; Ninnemann, Ulysses S; Roberts, A.P.; Rosenthal, Y.; Schulz, H.; Williams, F.H.; Yu, J. (Peer reviewed; Journal article, 2019-11-06)
      The last interglacial (LIG; ~130 to ~118 thousand years ago, ka) was the last time global sea level rose well above the present level. Greenland Ice Sheet (GrIS) contributions were insufficient to explain the highstand, ...

    • Dynamics of Spontaneous (Multi) Centennial‐Scale Variations of the Atlantic Meridional Overturning Circulation Strength During the Last Interglacial 

      Kessler, Augustin; Bouttes, Nathaelle; Roche, Didier M.; Ninnemann, Ulysses S; Tjiputra, Jerry (Journal article; Peer reviewed, 2020)
      Recent reconstructions of bottom water δ13C during the last interglacial (LIG) suggest short-lived variability in the Atlantic meridional overturning circulation (AMOC). Spontaneous (multi) centennial-scale variability of ...

    • Evaluating the biological pump efficiency of the Last Glacial Maximum ocean using δ13C 

      Morée, Anne; Schwinger, Jörg; Ninnemann, Ulysses S; Jeltsch-Thommes, Aurich; Bethke, Ingo; Heinze, Christoph (Journal article; Peer reviewed, 2021)
      Although both physical and biological marine changes are required to explain the 100 ppm lower atmospheric pCO2 of the Last Glacial Maximum (LGM, ∼21 ka) as compared to preindustrial (PI) times, their exact contributions ...

    • An international intercomparison of stable carbon isotope composition measurements of dissolved inorganic carbon in seawater 

      Cheng, Lin; Normandeau, Claire; Bowden, Roxane; Doucett, Richard; Gallagher, Barbora; Gillikin, David P; Kumamoto, Yuichiro; McKay, Jennifer L; Middlestead, Paul; Ninnemann, Ulysses S; Nothaft, Daniel; Dubinina, Elena O.; Quay, Paul; Reverdin, Gilles; Shirai, Kotaro; Mørkved, Pål Tore; Theiling, Bethany; Geldern, Robert; Wallace, D. W. R. (Peer reviewed; Journal article, 2019)
      We report results of an intercomparison of stable carbon isotope ratio measurements in seawater dissolved inorganic carbon (δ 13C‐DIC) which involved 16 participating laboratories from various parts of the world. The ...

    • A low climate threshold for south Greenland Ice Sheet demise during the Late Pleistocene 

      Irvali, Nil; Galaasen, Eirik Vinje; Ninnemann, Ulysses S; Rosenthal, Yair; Born, Andreas; Kleiven, Helga Flesche (Peer reviewed; Journal article, 2020-01-07)
      The Greenland Ice Sheet (GIS) has been losing mass at an accelerating rate over the recent decades. Models suggest a possible temperature threshold between 0.8 and 3.2 °C, beyond which GIS decline becomes irreversible. The ...

    • Reorganization of Atlantic Waters at sub-polar latitudes linked to deep-water overflow in both glacial and interglacial climate states 

      Holmes, Dakota E.; Babila, Tali L.; Ninnemann, Ulysses S; Bromley, Gordon; Tyrrell, Shane; Paterson, Greig A.; Curran, Michelle J.; Morley, Audrey (Journal article; Peer reviewed, 2022)
      While a large cryosphere may be a necessary boundary condition for millennial-scale events to persist, a growing body of evidence from previous interglacial periods suggests that high-magnitude climate events are possible ...

    • Seasonal sea ice persisted through the Holocene Thermal Maximum at 80°N 

      Pieńkowski, Anna J.; Husum, Katrine; Belt, Simon T.; Ninnemann, Ulysses S; Köseoğlu, Denizcan; Divine, Dmitry V.; Smik, Lukas; Knies, Jochen; Hogan, Kelly; Noormets, Riko (Journal article; Peer reviewed, 2021)
      The cryospheric response to climatic warming responsible for recent Arctic sea ice decline can be elucidated using marine geological archives which offer an important long-term perspective. The Holocene Thermal Maximum, ...

    • Stable oxygen isotope reconstruction of temperature exposure of the Icelandic cod (Gadus morhua) stock over the last 100 years 

      Von Leesen, Gotje; Ninnemann, Ulysses S; Campana, Steven E. (Journal article; Peer reviewed, 2020)
      Increasing water temperatures are predicted around the globe, with high amplitudes of warming in Subarctic and Arctic regions where Atlantic cod (Gadus morhua) populations currently flourish. We reconstructed oxygen isotope ...

    • Temperature exposure in cod driven by changes in abundance 

      Von Leesen, Gotje; Bogstad, Bjarte; Hjørleifsson, Einar; Ninnemann, Ulysses S; Campana, Steven E. (Journal article; Peer reviewed, 2022)
      Animals actively select the most suitable habitat in terms of fitness, much of which is mediated by temperature. We reconstructed population abundance, oxygen isotope and temperature chronologies for the Icelandic and the ...