Blar i forfatter "Chalk, Tom"

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    • Large-scale culturing of Neogloboquadrina pachyderma, its growth in, and tolerance of, variable environmental conditions 

      Westgård, Adele; Mohamed, Mohamed Mahmoud Ezat Ahmed; Chalk, Tom; Chierici, Melissa; Foster, Gavin L.; Meilland, Julie (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-08-09)
      The planktic foraminifera Neogloboquadrina pachyderma is a calcifying marine protist and the dominant planktic foraminifera species in the polar oceans, making it a key species in marine polar ecosystems. The calcium carbonate shells of foraminifera are widely used in palaeoclimate studies because their chemical composition reflects the seawater conditions in which they grow. This species provides ...

    • Late Miocene cooling coupled to carbon dioxide with Pleistocene-like climate sensitivity 

      Brown, Rachel M.; Chalk, Tom; Crocker, Anya J.; Wilson, Paul A.; Foster, Gavin L. (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-07-25)
      Earth’s climate cooled markedly during the late Miocene from 12 to 5 million years ago, with far-reaching consequences for global ecosystems. However, the driving forces of these changes remain controversial. A major obstacle to progress is the uncertainty over the role played by greenhouse gas radiative forcing. Here we present boron isotope compositions for planktic foraminifera, which record ...