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Foraminiferal reconstruction of mid- to late-Holocene ocean circulation and climate variability in Disko Bugt, West Greenland

Geography Department, Durham University, South Road, Durham DH1 3LE, UK, J.M.Lloyd{at}durham.ac.uk

Antoon Kuijpers

Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen , Denmark

Antony Long

Geography Department, Durham University, South Road, Durham DH1 3LE, UK

Matthias Moros

Baltic Sea Research Institute, Seestrasse 15, 18119 Rostock, Germany, Bjerknes Centre for Climate Research, Allegaten 55, 5007 Bergen, Norway

Laura A. Park

Geography Department, Durham University, South Road, Durham DH1 3LE, UK

Benthic foraminifera from two cores collected from Disko Bugt, a large marine embayment in West Greenland, are used to investigate hydrographic changes during the mid to late Holocene. The records document fluctuations in the West Greenland Current (WGC) linked to large-scale changes in North Atlantic circulation and, for one core, impacts of local climate changes. In particular, changes in the cold East Greenland Current (EGC) and the warm, more saline Irminger Current (IC) influence the WGC and propagate into Disko Bugt. The cores record subsurface warming associated with the `Holocene Thermal Maximum' (HTM) from c. 6 to 5 ka cal. BP. Gradual cooling of WGC from 5 ka cal. BP was interrupted by an abrupt warm interval from 3.9 to 3.5 ka cal. BP, before cooling became more prominent from 3.5 to 2 ka cal. BP. This cold period corresponds to the well-documented Northern Hemisphere cooling of the neoglacial and we interpret it as reflecting enhanced flux from the EGC and reduced IC flux to the WGC in Disko Bugt. Colder subsurface conditions from 3.5 ka cal. BP correspond to major hydrographic and climate changes elsewhere in West Greenland, reflecting the final transition from HTM to the neoglacial in this region. Relatively warm conditions identified from c. 2.0 to 1.4 ka cal. BP are followed by gradual cooling to 0.7 ka cal. BP, interrupted by a brief warm episode around 1 ka cal. BP. The late-Holocene fluctuations in WGC recorded in Disko Bugt can be linked to North Atlantic oceanographic changes identified on the East Greenland and North Icelandic shelf.

Key Words: Ocean circulation • climate variability • foraminifera • hydrographic variability • Disko Bugt • West Greenland.

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