Development of the Western Boundary Undercurrent at Eirik Drift related to changing climate since the early Miocene

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doi: 10.1016/j.dsr.2014.07.010
Author(s): Müller-Michaelis, Antje; Uenzelmann-Neben, Gabriele
Author Affiliation(s): Primary:
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany
Volume Title: Deep-Sea Research. Part I: Oceanographic Research Papers
Source: Deep-Sea Research. Part I: Oceanographic Research Papers, Vol.93, p.21-34. Publisher: Elsevier, Oxford, International. ISSN: 0967-0637 CODEN: DRPPD5
Note: In English. 55 refs.; illus., incl. sects., sketch map
Summary: Eirik Drift lies on the slope south of Greenland, where it has been formed under the influence of the Western Boundary Undercurrent (WBUC) closely downstream of its origin in the deep-water formation centres of the Nordic Seas. Therefore, the sediment record at Eirik Drift documents modifications in pathways and intensity of the WBUC. These modifications reflect alterations in deep-water formation in the Nordic Seas and are therefore coupled with climate changes. Based on the seismostratigraphic analysis of sedimentary architecture identified in a set of high-resolution seismic reflection data, we have reconstructed the palaeocirculation of the WBUC at Eirik Drift since the early Miocene. We revealed a strong WBUC during warm climate conditions, and in phases of climate cooling with enhanced sea-ice extent we interpreted weak WBUC influence. We suggest a southward shift of the deep-water formation regions along with a shift of the deep current system during the cool phases. This shift implies that the main North Atlantic Deep Water route affected Eirik Drift only during warm phases and that during cool phases weak branches of the circulation system flowed over Eirik Drift. Abstract Copyright (2014) Elsevier, B.V.
Year of Publication: 2014
Research Program: IODP Integrated Ocean Drilling Program
ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Arctic region; Atlantic Ocean; Cenozoic; Climate change; Contourite; Currents; Eirik Drift; Expedition 303; Expeditions 303/306; Geophysical methods; Geophysical profiles; Geophysical surveys; Greenland; Integrated Ocean Drilling Program; Labrador Sea; Leg 105; Marine sediments; Neogene; North Atlantic; ODP Site 646; Ocean Drilling Program; Ocean currents; Paleo-oceanography; Paleoclimatology; Quaternary; Sediments; Seismic methods; Seismic profiles; Seismic stratigraphy; South Greenland; Stratigraphic units; Surveys; Tertiary
Coordinates: N570000 N590000 W0440000 W0500000
Record ID: 2015013362
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands