Evidence for ice-free summers in the late Miocenecentral Arctic Ocean
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- Evidence for ice-free summers in the late Miocenecentral Arctic Ocean
- Stein, Ruediger
- Science & Technology - Other Topics
- Climate science; Earth sciences; Oceanography; RV Polarstern
- Issue Date
- Stein, Ruediger., et al. 2016. Evidence for ice-free summers in the late Miocenecentral Arctic Ocean. NATURE COMMUNICATIONS, 7(11148): 1-13.
- 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 sediments from steep headwalls has led to exhumation of Miocene sediments close to the seafloor. Here we document the presence
of IP25 as a proxy for spring sea-ice cover and alkenone-based summer sea-surface temperatures >4°C that support a seasonal sea-ice cover with an ice-free summer season
being predominant during the late Miocene in the central Arctic Ocean. A comparison of our proxy data with Miocene climate simulations seems to favour either relatively high late
Miocene atmospheric CO2 concentrations and/or a weak sensitivity of the model to simulate the magnitude of high-latitude warming in a warmer than modern climate.
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