Blar i forfatter "Fahl, Kirsten"

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    • Evidence for ice-free summers in the late Miocene central Arctic Ocean 

      Stein, Ruediger; Fahl, Kirsten; Schreck, Michael; Knorr, Gregor; Niessen, Frank; Forwick, Matthias; Gebhardt, Catalina; Jensen, Laura; Kaminski, Michael; Kopf, Achim; Matthiessen, Jens; Jokat, Wilfried; Lohmann, Gerrit (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-04-04)
      Although the permanently to seasonally ice-covered Arctic Ocean is a unique and sensitive component in the Earth’s climate system, the knowledge of its long-term climate history remains very limited due to the restricted number of pre-Quaternary sedimentary records. During Polarstern Expedition PS87/2014, we discovered multiple submarine landslides along Lomonosov Ridge. Removal of younger ...

    • Neogene dinoflagellate cysts and acritarchs from the high northern latitudes and their relation to sea surface temperature 

      Schreck, Michael; Nam, Seung-Il; Clotten, Caroline; Fahl, Kirsten; De Schepper, Stijn; Forwick, Matthias; Matthiessen, Jens (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-09-13)
      <p>Organic-walled dinoflagellate cysts and acritarchs are a vital tool for reconstructing past environmental change, in particular in the Neogene of the high northern latitudes where marine deposits are virtually barren of traditionally used calcareous microfossils. Yet only little is known about the paleoenvironmental value of fossil assemblages that do not have modern analogues, so that reconstructions ...

    • On the causes of Arctic sea ice in the warm Early Pliocene 

      Clotten, Caroline; Stein, Rüdiger; Fahl, Kirsten; Schreck, Michael; Risebrobakken, Bjørg; De Schepper, Stijn (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-01-30)
      Scattered and indirect evidence suggests that sea ice occurred as far south as the Iceland Sea during the Early Pliocene, when the global climate was warmer than present. However, conclusive evidence as well as potential mechanisms governing sea ice occurrence outside the Arctic Ocean during a time with elevated greenhouse gas concentrations are still elusive. Here we present a suite of organic ...

    • Sea ice and millennial-scale climate variability in the Nordic seas 90 kyr ago to present 

      Hoff, Ulrike; Rasmussen, Tine Lander; Stein, Ruediger; Ezat, Mohamed; Fahl, Kirsten (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-07-26)
      In the light of rapidly diminishing sea ice cover in the Arctic during the present atmospheric warming, it is imperative to study the distribution of sea ice in the past in relation to rapid climate change. Here we focus on glacial millennial-scale climatic events (Dansgaard/Oeschger events) using the sea ice proxy IP25 in combination with phytoplankton proxy data and quantification of diatom species ...