气候变化领域集成服务门户(CCPortal): Reduced Arctic sea ice extent during the mid-Pliocene Warm Period concurrent with increased Atlantic-climate regime

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DOI	10.1016/j.epsl.2020.116535
	Reduced Arctic sea ice extent during the mid-Pliocene Warm Period concurrent with increased Atlantic-climate regime
	Rahaman W.; Smik L.; Köseoğlu D.; N L.; Tarique M.; Thamban M.; Haywood A.; Belt S.T.; Knies J.
发表日期	2020
ISSN	0012821X
卷号	550
英文摘要	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. © 2020 Elsevier B.V.
关键词	Arctic Atlantification mid-Pliocene North Atlantic Current sea ice
英文关键词	Climate change; Ferroelectric RAM; Isotopes; Oceanography; Sea ice; Springs (components); Submarine geology; Climate prediction; Controlling factors; Current generation; Marine isotope stages; Marine sediments; Neodymium isotopic composition; Sea ice concentration; Volume transport; Climate models; concentration (composition); marine sediment; neodymium isotope; paleoclimate; Pliocene; proxy climate record; sea ice; warming; water mass; Arctic; Arctic Ocean; Atlantic Ocean; Fram Strait
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202844
作者单位	National Centre for Polar and Ocean, Research (NCPOR), Ministry of Earth Sciences, Vasco-da-Gama, Goa, 403804, India; School of Geography, Earth and Environmental Sciences, University of PlymouthPL4 8AA, United Kingdom; CAGE – Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences, UiT The Arctic University of Norway, Tromsø, 9037, Norway; Department of Marine Geology, Mangalore University, Mangalore, India; School of Earth and Environment, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, United Kingdom; Geological Survey of Norway, N-7491, Trondheim, Norway
推荐引用方式 GB/T 7714	Rahaman W.,Smik L.,Köseoğlu D.,et al. Reduced Arctic sea ice extent during the mid-Pliocene Warm Period concurrent with increased Atlantic-climate regime[J],2020,550.
APA	Rahaman W..,Smik L..,Köseoğlu D..,N L..,Tarique M..,...&Knies J..(2020).Reduced Arctic sea ice extent during the mid-Pliocene Warm Period concurrent with increased Atlantic-climate regime.Earth and Planetary Science Letters,550.
MLA	Rahaman W.,et al."Reduced Arctic sea ice extent during the mid-Pliocene Warm Period concurrent with increased Atlantic-climate regime".Earth and Planetary Science Letters 550(2020).