Antarctic link to deep flow speed variation during Marine Isotope Stage 3 in the western North Atlantic

Hoogakker, Babette A A; McCave, I Nick; Vautravers, M. J.

doi:10.1016/j.epsl.2007.03.003

Cited by 32 publications

(44 citation statements)

References 72 publications

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“…The 3 Nd at Site 1060 before Greenland IS 11 and during IS 8 was À11.2, intermediate between the SSW and the MIS 3 GNAIW end member compositions. Therefore, the slightly less radiogenic Nd isotope composition at Site 1060 during parts of MIS 3 than during the LGM supports the assertion that at least at some stage during MIS 3 GNAIW influence extended deeper than during the LGM, with Site 1060 being located in the transition zone between SSW and GNAIW (see also Vidal et al, 1997;Hoogakker et al, 2007). The Nd isotope record suggests deeper GNAIW ventilation along the Blake Ridge preceding Greenland IS 11 followed by a period of shallowing with SSW dominance, and a resumption of deeper influence of GNAIW at the beginning of Greenland IS 8 (Fig.…”

Section: Based On High Benthic Foraminiferal D 13 C Values (Epifaunalsupporting

confidence: 60%

“…The chronologies for core 1060 follows Hoogakker et al (2007) who tie in the initial age model for Site 1060 presented by Vautravers et al (2004), based on correlation between the percentage of warm surface-dwelling planktonic foraminifera, to the foraminiferal oxygen isotope (d 18 O) record of core MD95-2042 off Portugal, with the revised age scale for the Greenland ice cores (SFCP04 timescale) . The SFCP04 timescales is based on 14 C dating of the planktonic foraminiferal species Globigerina bulloides, calibrated by pairs of 14 C and 230 Th measurements on corals (Hoogakker et al, 2007).…”

Section: Methodsmentioning

confidence: 99%

“…The SFCP04 timescales is based on 14 C dating of the planktonic foraminiferal species Globigerina bulloides, calibrated by pairs of 14 C and 230 Th measurements on corals (Hoogakker et al, 2007).…”

Section: Methodsmentioning

confidence: 99%

“…1) surrounding Heinrich Event 4 at submillennial resolution. These data are compared with a sortable silt mean size ðSSÞ record from the same site (Hoogakker et al, 2007) and epibenthic carbon isotope data from nearby core sites along the Blake Ridge (Hagen and Keigwin, 2002) in order to better constrain the deep water mass distribution in the western North Atlantic during this climatically highly variable period.…”

Section: Water-mass Tagging By Nd Isotopesmentioning

confidence: 99%

“…Similar to the sortable silt record of the same core (cf. Hoogakker et al, 2007), the Nd isotope evolution does not follow the short-term DansgaardeOeschger climate cycles recorded in the Greenland ice cores (Fig. 5).…”

Section: Neodymium Isotope Compositionsmentioning

confidence: 99%

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Changes in North Atlantic Deep Water strength and bottom water masses during Marine Isotope Stage 3 (45–35kaBP)

Gutjahr

Hoogakker

McCave

2010

Quaternary Science Reviews

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a b s t r a c tThe strength of the North Atlantic Meridional Overturning Circulation during climatically highly variable Marine Isotope Stage (MIS) 3 has attracted much attention in recent years. Here we present highresolution Nd isotope compositions of past seawater derived from authigenic FeeMn oxyhydroxides recovered from drift sediments on the Blake Ridge in the deep western North Atlantic (ODP Leg 172, Site 1060, 3481 m water depth). The data cover the period from 45 to 35 ka BP, tracing circulation changes during major Heinrich iceberg discharge event 4 (H4, w40e39 ka BP). The Nd isotope record suggests that there was no northern-source water (NSW) mass like modern NADW at the deeper part of Blake Ridge at any time between 45 and 35 ka. This is fundamentally different from the hydrographic situation during the Holocene where NADW extends below 4500 m at this location. The 3 Nd of past deep water recorded in the Blake Ridge sediments was least radiogenic during Dansgaard/Oeschger (D/O) Interstadial (IS) 8 (3 Nd ¼ À11.3) and most radiogenic immediately preceding IS 9 (3 Nd ¼ À9.8). More radiogenic compositions were also recorded during H4 (À10.2 3 Nd À9.9). The Nd isotope variability in MIS 3 matches that of a physical bottom current strength reconstruction from the same location. Neither record follows the pattern of Northern Hemisphere D/O climatic cycles. In our record, reduced mixing with northern source waters started in stadial 12 and lasted until after H4 in stadial 9, followed by a rapid increase in NSW contribution thereafter. This major change in the Nd isotope record predates the iceberg discharge event Heinrich 4 by more than 3 ka indicating a shallowing of the water mass boundary between Glacial North Atlantic Intermediate Water and Southern Source Water beneath. This early change in bottom water properties at the deep Blake Ridge suggests that North Atlantic deep water advection may already have decreased several thousand years before the actual iceberg discharge event and associated freshening of the surface waters in the North Atlantic. The change can thus not be attributed to climatic events in the North Atlantic but may be related to changes in flux of deep water from the South.

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Section: Based On High Benthic Foraminiferal D 13 C Values (Epifaunalsupporting

confidence: 60%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Water-mass Tagging By Nd Isotopesmentioning

confidence: 99%

Section: Neodymium Isotope Compositionsmentioning

confidence: 99%

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Changes in North Atlantic Deep Water strength and bottom water masses during Marine Isotope Stage 3 (45–35kaBP)

Gutjahr

Hoogakker

McCave

2010

Quaternary Science Reviews

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The intensification of northern component deepwater formation during the mid‐Pleistocene climate transition

Poirier

Billups

2014

Paleoceanography

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We reconstruct mid-Pleistocene (marine isotope stages (MISs) 13-18) deepwater hydrography at Ocean Drilling Program Site 1063 (4583 m water depth, subtropical North Atlantic) using benthic foraminiferal stable isotope records. These new records complete an~900 kyr long stratigraphy spanning (1993) for the importance of the Nordic heat pump in establishing strong 100 kyr cyclicity in late Pleistocene glacial cycles.

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Regional and global benthic δ¹⁸O stacks for the last glacial cycle

2016

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Although detailed age models exist for some marine sediment records of the last glacial cycle (0–150 ka), age models for many cores rely on the stratigraphic correlation of benthic δ18O, which measures ice volume and deep ocean temperature change. The large amount of data available for the last glacial cycle offers the opportunity to improve upon previous benthic δ18O compilations, such as the “LR04” global stack. Not only are the age constraints for the LR04 stack now outdated but a single global alignment target neglects regional differences of several thousand years in the timing of benthic δ18O change during glacial terminations. Here we present regional stacks that characterize mean benthic δ18O change for 8 ocean regions and a volume‐weighted global stack of data from 263 cores. Age models for these stacks are based on radiocarbon data from 0 to 40 ka, correlation to a layer‐counted Greenland ice core from 40 to 56 ka, and correlation to radiometrically dated speleothems from 56 to 150 ka. The regional δ18O stacks offer better stratigraphic alignment targets than the LR04 global stack and, furthermore, suggest that the LR04 stack is biased 1–2 kyr too young throughout the Pleistocene. Finally, we compare global and regional benthic δ18O responses with sea level estimates for the last glacial cycle.

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Antarctic link to deep flow speed variation during Marine Isotope Stage 3 in the western North Atlantic

Cited by 32 publications

References 72 publications

Changes in North Atlantic Deep Water strength and bottom water masses during Marine Isotope Stage 3 (45–35kaBP)

Changes in North Atlantic Deep Water strength and bottom water masses during Marine Isotope Stage 3 (45–35kaBP)

The intensification of northern component deepwater formation during the mid‐Pleistocene climate transition

Regional and global benthic δ¹⁸O stacks for the last glacial cycle

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Antarctic link to deep flow speed variation during Marine Isotope Stage 3 in the western North Atlantic

Cited by 32 publications

References 72 publications

Changes in North Atlantic Deep Water strength and bottom water masses during Marine Isotope Stage 3 (45–35kaBP)

Changes in North Atlantic Deep Water strength and bottom water masses during Marine Isotope Stage 3 (45–35kaBP)

The intensification of northern component deepwater formation during the mid‐Pleistocene climate transition

Regional and global benthic δ18O stacks for the last glacial cycle

Contact Info

Product

Resources

About

Regional and global benthic δ¹⁸O stacks for the last glacial cycle