Browsing Bergen Open Research Archive by Author "Leutert, Thomas Jan"

Now showing items 1-8 of 8

    • Application of Clumped Isotope Thermometry to Benthic Foraminifera 

      Piasecki, Alison; Bernasconi, Stefano M.; Grauel, Anna-Lena; Hannisdal, Bjarte; Ho, Sze Ling; Leutert, Thomas Jan; Marchitto, Thomas M.; Meinicke, Niklas; Tisserand, Amandine Aline; Meckler, Anna Nele (Peer reviewed; Journal article, 2019-04)
      Obtaining absolute temperatures of the ocean in deep time is complicated by the lack of constraints on seawater chemistry. Seawater salinity, carbonate ion concentration, δ18O, and elemental abundance changes may obscure ...

    • Clumped isotope thermometry as a new tool for reconstructing Miocene climate change 

      Leutert, Thomas Jan (Doctoral thesis, 2020-01-27)
      This PhD thesis focuses on the clumped isotope paleothermometer and its application to foraminiferal carbonates buried in ocean sediments. Based on new proxy evidence for ocean temperature, the thesis aims at improving our ...

    • Coupled Southern Ocean cooling and Antarctic ice sheet expansion during the middle Miocene 

      Leutert, Thomas Jan; Auderset, Alexandra; Martínez-García, Alfredo; Modestou, Sevasti Eleni; Meckler, Anna Nele (Journal article; Peer reviewed, 2020)
      The middle Miocene climate transition (~14 million years ago) was characterized by a dramatic increase in the volume of the Antarctic ice sheet. The driving mechanism of this transition remains under discussion, with ...

    • InterCarb: A Community Effort to Improve Interlaboratory Standardization of the Carbonate Clumped Isotope Thermometer Using Carbonate Standards 

      Bernasconi, S.M.; Daeron, Mathieu; Bergmann, Kristin D.; Bonifacie, Magali; Meckler, Anna Nele; Affek, H. P.; Anderson, N.; Bajnai, D.; Barkan, E.; Beverly, E.; Blamart, D.; Burgener, L.; Calmels, D.; Chaduteau, C.; Clog, M.; Davidheiser-Kroll, B.; Davies, A.; Dux, F.; Eiler, J.; Elliott, B.; Fetrow, A. C.; Fiebig, J.; Goldberg, S.; Hermoso, M.; Huntington, K. W.; Hyland, E.; Ingalls, M.; Jaggi, M.; John, C. M.; Jost, A. B.; Katz, S.; Kelson, J.; Kluge, T.; Kocken, I. J.; Laskar, A.; Leutert, Thomas Jan; Liang, D.; Lucarelli, J.; Mackey, T. J.; Mangenot, X.; Meinicke, Niklas; Modestou, Sevasti Eleni; Müller, I. A.; Murray, S.; Neary, A.; Packard, N.; Passey, B. H.; Pelletier, E.; Petersen, S.; Piasecki, Alison; Ziegler, M. (Journal article; Peer reviewed, 2021)
      Increased use and improved methodology of carbonate clumped isotope thermometry has greatly enhanced our ability to interrogate a suite of Earth-system processes. However, interlaboratory discrepancies in quantifying ...

    • North Atlantic surface ocean warming and salinization in response to middle Eocene greenhouse warming 

      van der Ploeg, Robin; Cramwinckel, Margot J.; Kocken, Ilja J.; Leutert, Thomas Jan; Bohaty, Steven M.; Fokkema, Chris D.; Hull, Pincelli M.; Meckler, Anna Nele; Middelburg, Jack J.; Müller, Inigo A.; Penman, Donald E.; Peterse, Francien; Reichart, Gert-Jan; Sexton, Philip F.; Vahlenkamp, Maximilian; De Vleeschouwer, David; Wilson, Paul A.; Ziegler, Martin; Sluijs, Appy (Journal article; Peer reviewed, 2023)
      Quantitative reconstructions of hydrological change during ancient greenhouse warming events provide valuable insight into warmer-than-modern hydrological cycles but are limited by paleoclimate proxy uncertainties. We ...

    • Sensitivity of clumped isotope temperatures in fossil benthic and planktic foraminifera to diagenetic alteration 

      Leutert, Thomas Jan; Sexton, Philip; Tripati, Aradhna; Piasecki, Alison; Ho, Sze Ling; Meckler, Anna Nele (Peer reviewed; Journal article, 2019)
      Applying the clumped isotope (Δ47) thermometer to foraminifer microfossils offers the potential to significantly improve paleoclimate reconstructions, owing to its insensitivity to the isotopic composition of seawater ...

    • Southern Ocean bottom-water cooling and ice sheet expansion during the middle Miocene climate transition 

      Leutert, Thomas Jan; Modestou, Sevasti Eleni; Bernasconi, Stefano M.; Meckler, A. Nele (Journal article; Peer reviewed, 2021)
      The middle Miocene climate transition (MMCT), around 14 Ma, was associated with a significant climatic shift, but the mechanisms triggering the event remain enigmatic. We present a clumped isotope (Δ47) bottom-water ...

    • Warm Middle Miocene Indian Ocean Bottom Water Temperatures: Comparison of Clumped Isotope and Mg/Ca‐Based Estimates 

      Modestou, Sevasti Eleni; Leutert, Thomas Jan; Bremer, Alvaro Fernandez; Lear, Caroline H.; Meckler, Anna Nele (Journal article; Peer reviewed, 2020)
      The middle Miocene is an important analogue for potential future warm climates. However, few independent deep ocean temperature records exist, though these are important for climate model validation and estimates of changes ...