Details

Autor(en) / Beteiligte

• Rahaman, Waliur
• Smik, Lukas
• Köseoğlu, Deniz
• N, Lathika
• Tarique, Mohd
• Thamban, Meloth
• Haywood, Alan
• Belt, Simon T.
• Knies, J.

Titel

Reduced Arctic sea ice extent during the mid-Pliocene Warm Period concurrent with increased Atlantic-climate regime

Ist Teil von

• Earth and planetary science letters, 2020-11, Vol.550, p.116535, Article 116535

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2020

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• •The hypothesis “Atlantification of Arctic” is tested for mid-Pliocene warm period.•Near complete “Atlantification” of Eurasian sector of Arctic Ocean was observed.•Orbital forcing was dominant factor for north Atlantic volume transport to Arctic.•Atlantification caused ∼30–35% reduction in Arctic spring sea ice.•Our results provide important input for improving Arctic climate modeling. Quantifying the contribution of poleward oceanic heat transport to the Arctic Ocean is important for making future sea ice and climate predictions. To highlight its potential importance in a warmer world, we present a new record of water-mass exchange between the Atlantic and the Arctic Oceans using the authigenic neodymium isotopic composition of marine sediments from the Fram Strait during the past ∼3.4 to 2.6 Ma. In this study, we target the mid-Pliocene Warm Period (mPWP: 3.264–3.025 Ma) of the Pliocene epoch, the most recent geological analogue for future climate change. We complement our semi-quantitative water mass exchange reconstruction with estimates of spring sea ice concentration based on source-specific biomarkers. Our estimates of volume transport of warm waters into the Arctic Ocean suggest long-term secular changes from the lowest during the Marine Isotope Stage M2 “glacial” (3.312–3.264 Ma), to near complete “Atlantification” of the Eurasian sector of the Arctic Ocean during the mPWP. Orbital forcing is found to be the dominant controlling factor for modulating northward volume transport of Atlantic-derived water masses, with an associated reduction in Arctic spring sea ice concentration of ∼30–35%. Current generation models often produce diverging results, however, and have not yet been validated against proxy data in northern high latitude settings during the mPWP. Our new results of northward volume transport and sea ice extent therefore provide much needed input for validation of current generation models aimed at improving the robustness of future climate modeling in the Arctic.