Deep Ocean Storage of Heat and CO_2 in the Fram Strait, Arctic Ocean During the Last Glacial Period

Mohamed M. Ezat; Tine L. Rasmussen; Mathis P. HainMervyn GreavesJames W. B. RaeKatarzyna ZamelczykThomas M. MarchittoS?nke SzidatLuke C. Skinner

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Deep Ocean Storage of Heat and CO_2 in the Fram Strait, Arctic Ocean During the Last Glacial Period

机译：Deep Ocean Storage of Heat and CO_2 in the Fram Strait, Arctic Ocean During the Last Glacial Period

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The Fram Strait is the only deep gateway between the Arctic Ocean and the Nordic Seas and thus is a key area to study past changes in ocean circulation and the marine carbon cycle. Here, we study deep ocean temperature, δ~(18)O, carbonate chemistry (i.e., carbonate ion concentration [CO_3~(2?)]), and nutrient content in the Fram Strait during the late glacial (35,000–19,000 years BP) and the Holocene based on benthic foraminiferal geochemistry and carbon cycle modeling. Our results indicate a thickening of Atlantic water penetrating into the northern Nordic Seas, forming a subsurface Atlantic intermediate water layer reaching to at least ~2,600 m water depth during most of the late glacial period. The recirculating Atlantic layer was characterized by relatively high [CO_3~(2?)] and low δ~(13)C during the late glacial, and provides evidence for a Nordic Seas source to the glacial North Atlantic intermediate water flowing at 2,000–3,000 m water depth, most likely via the Denmark Strait. In addition, we discuss evidence for enhanced terrestrial carbon input to the Nordic Seas at ~23.5 ka. Comparing our δ~(13)C and qualitative [CO_3~(2?)] records with results of carbon cycle box modeling suggests that the total terrestrial CO_2 release during this carbon input event was low, slow, or directly to the atmosphere.

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《Paleoceanography》 |2021年第8期|e2021PA004216-1-e2021PA004216-13|共13页
作者
Mohamed M. Ezat; Tine L. Rasmussen; Mathis P. HainMervyn GreavesJames W. B. RaeKatarzyna ZamelczykThomas M. MarchittoS?nke SzidatLuke C. Skinner;
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CAGE - Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences, UiT, The Arctic University of Norway, Troms?, Norway;

Department of Earth and Planetary Sciences, University of California, Santa Cruz, CA, USA;

Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, Cambridge, UKSchool of Earth & Environmental Sciences, University of St. Andrews, St Andrews, UKDepartment of Geological Sciences, University of Colorado Boulder, Boulder, CO, USADepartment of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP), University of Bern, Bern, Switzerland;

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正文语种英语
中图分类海洋学;
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Deep Ocean Storage; Heat and CO_2; Arctic Ocean During;

Deep Ocean Storage of Heat and CO_2 in the Fram Strait, Arctic Ocean During the Last Glacial Period

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