The significance of Atlantic Water routing in the Nordic Seas

The Nordic Seas are a key region for global ocean circulation, crucial in water mass exchange between the North Atlantic and the Arctic oceans, and deepwater formation. The advection of Atlantic Water (AW) to the Nordic Seas is decisive for the oceanography and climate of the region and beyond. Here, we present a set of sedimentary records, including two new cores from the western Nordic Seas to reconstruct the history of AW routing in the Nordic Seas over the Holocene. Our results show that the early Holocene (11.7–8 ka BP) thermal maximum, caused by an ‘overshoot’ of overturning circulation and high insolation, was limited to the eastern Nordic Seas, while the western part remained cold due to the meltwater blocking the spreading of AW. After 8 ka BP, the retreat of the freshwater lid allowed AW to reach the central Greenland Sea, where deep convection developed. After 5 ka BP, the increase in sea-ice export from the Arctic strengthened deep convection, which intensified the westward AW flow. A disruption of convectional activity around 2.7 ka BP, triggered by a minimum in solar activity, caused cooling and expansion of sea ice in the Nordic Seas and might have contributed to a global climatic deterioration. The overturning circulation in the Nordic Seas did not recover to its previous state until the present. We demonstrate that the rate of AW advection into the Nordic Seas alone is not enough to understand the oceanographic evolution of this area and its influence on regional or even global ocean and climate changes. The shifts in AW routing within the Nordic Seas and the rate of deep convection are also important

Arctic · Climatology · Glacial period · Holocene · Meltwater · North Atlantic Deep Water · Sea ice · Thermohaline circulation · Water mass · Geology and Paleoclimatology Research · Marine and environmental studies · Methane Hydrates and Related Phenomena · Geology · Oceanography · Paleontology

• Paleoceanographic changes and calcium carbonate dissolution in the central Fram Strait during the last 20 ka

  Open Access•Katarzyna Zamelczyk, Tine L Rasmussen et al.•Quaternary Research•2012

  Añadir item

• Paleoceanographic evolution of the SW Svalbard margin (76°N) since 20,000 14 C yr BP

  Open Access•Tine L Rasmussen, Erik Thomsen et al.•Quaternary Research•2007

  Añadir item

• A 17,000-year glacio-eustatic sea level record

  Open Access•Richard G Fairbanks•Nature•1989

  Añadir item

• Collapse and rapid resumption of Atlantic meridional circulation linked to deglacial climate changes

  Open Access•Jerry F McManus, Roger François et al.•Nature•2004

  Añadir item

• Structure and origin of Holocene cold events

  Open Access•Heinz Wanner, Olga N Solomina et al.•Quaternary Science Reviews•2011

  Añadir item

• A long-term numerical solution for the insolation quantities of the Earth

  Open Access•J Laskar, Philippe Robutel et al.•Astronomy & Astrophysics•2004

  Añadir item

• The Holocene Thermal Maximum around Svalbard, Arctic North Atlantic; molluscs show early and exceptional warmth

  Open Access•Jan Mangerud, John Inge Svendsen•The Holocene•2017

  Añadir item

• Environmental variability off NE Greenland (western Fram Strait) during the past 10,600 years

  Open Access•Marc Zehnich, Robert F Spielhagen et al.•The Holocene•2020

  Añadir item

• Holocene temperature and salinity variability of the Atlantic Water inflow to the Nordic seas

  Open Access•Tine L Rasmussen, Erik Thomsen•The Holocene•2010

  Añadir item

• Climatic change in Chile at around 2700 BP and global evidence for solar forcing

  Open Access•Bas Van Geel, Calvin J Heusser et al.•The Holocene•2000

  Añadir item

• Effects of mid-Holocene river runoff on the Arctic ocean/sea-ice system

  Open Access•Matthias Prange, Gerrit Lohmann•The Holocene•2003

  Añadir item

• IntCal13 and Marine13 Radiocarbon Age Calibration Curves 0–50,000 Years cal BP

  Open Access•Paula J Reimer, Edouard Bard et al.•Radiocarbon•2013

  Añadir item

• Marine20—The Marine Radiocarbon Age Calibration Curve (0–55,000 cal BP)

  Open Access•Timothy J Heaton, Peter Köhler et al.•Radiocarbon•2020

  Añadir item

• Extended 14 C Data Base and Revised Calib 3.0 14 C Age Calibration Program

  Open Access•Minze Stuiver, Paula J Reimer•Radiocarbon•1993

  Añadir item

• A Note on Reporting of Reservoir 14 C Disequilibria and Age Offsets

  Open Access•Guillaume Soulet, Luke C Skinner et al.•Radiocarbon•2016

  Añadir item

• The IntCal20 Northern Hemisphere Radiocarbon Age Calibration Curve (0–55 cal kBP)

  Open Access•Paula J Reimer, William E N Austin et al.•Radiocarbon•2020

  Añadir item