Sea-surface temperature variability and deep water reorganisation in the subtropical North Atlantic during isotope stage 2-4

Author(s): Hagen, Sveinung; Keigwin, Lloyd D.
Author Affiliation(s): Primary:
University of Tromso, Department of Geology, Tromso, Norway
Stockholm University, Sweden
Woods Hole Oceanographic Institution, United States
Volume Title: Climatic variability recorded in sediment drifts from the western North Atlantic Ocean (ODP Leg 172)
Volume Author(s): Rio, Domenico, editor; Arnold, Eve
Source: Climatic variability recorded in sediment drifts from the western North Atlantic Ocean (ODP Leg 172), edited by Domenico Rio and Eve Arnold. Marine Geology, 189(1-2), p.145-162. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0025-3227 CODEN: MAGEA6
Note: In English. 71 refs.; illus., incl. 1 table, sketch map
Summary: Two sediment cores from a high-accumulation sediment drift at ∼3000-m water depth in the western North Atlantic are investigated in order to examine possible linkages between subtropical surface and bottom water properties, and global climate oscillations during the last glacial-interglacial cycle. Planktonic foraminiferal assemblages and the δ18O of Globigerinoides ruber both document large sea-surface temperature oscillations (3-4°C) that appear to co-vary with Greenland ice core records. Short episodes of sea-surface cooling as far south as the Blake Outer Ridge at ∼33°N are inferred from increased abundance of the polar species Neogloboquadrina pachyderma sinistral during the ice core stadials events. Nutrient proxy records suggest that the deep waters flooding the site alternated between a northern (North Atlantic Deep Water) and a southern (Southern Ocean Water) source. In most cases, warm surface water conditions (interstadials) were accompanied by a strong North Atlantic Deep Water component in the bottom water circulation. However, the transitions into Interstadial 14 and 12 seem to be marked by a ∼1500-yr lag between surface water warming, and the deep water circulation shift, as recorded by %CaCO3 and δ13C of benthonic foraminifera. Abstract Copyright (2002) Elsevier, B.V.
Year of Publication: 2002
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Antarctic Bottom Water; Arctic region; Assemblages; Atlantic Ocean; Blake-Bahama Outer Ridge; Cenozoic; Climate change; Correlation; Deep-water environment; Foraminifera; Globigerinacea; Globigerinidae; Globigerinoides; Globigerinoides ruber; Greenland; Ice cores; Invertebrata; Isotopes; Leg 172; Marine environment; Microfossils; Neogloboquadrina; Neogloboquadrina pachyderma; North Atlantic; North Atlantic Deep Water; ODP Site 1059; Ocean Drilling Program; Ocean circulation; Paleo-oceanography; Paleocirculation; Paleoclimatology; Paleoecology; Planktonic taxa; Pleistocene; Protista; Quaternary; Rotaliina; Sea-surface temperature; Stable isotopes; Subtropical environment; Upper Pleistocene
Coordinates: N314027 N314027 W0752507 W0752507
Record ID: 2002076838
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands