(Table 2) Trace metal ratios of various benthic foraminifera shells ...

Benthic foraminiferal d13C and Cd/Ca studies suggest that deep Atlantic circulation during the Last Glacial Maximum was very different from today, with high-nutrient (low d13C, high Cd) deep Southern Ocean Water (SOW) penetrating far into the North Atlantic. However, if some glacial d13C values are...

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Bibliographic Details
Main Authors: Marchitto, Thomas M, Oppo, Delia W, Curry, William B
Format: Dataset
Language:English
Published: PANGAEA 2002
Subjects:
Event label
Latitude of event
Longitude of event
Elevation of event
DEPTH, sediment/rock
Depth, top/min
Depth, bottom/max
Epoch
Species
Calcium
Zinc/Calcium ratio
Cadmium/Calcium ratio
Manganese/Calcium ratio
Comment
Composite Core
Piston corer
Leg162
CH8X
V28
V29
Joides Resolution
Jean Charcot
Vema
Ocean Drilling Program ODP
Charcot
Southern Ocean
NADW
North Atlantic Deep Water
North Atlantic
Online Access:https://dx.doi.org/10.1594/pangaea.844495
https://doi.pangaea.de/10.1594/PANGAEA.844495
Description
Summary:Benthic foraminiferal d13C and Cd/Ca studies suggest that deep Atlantic circulation during the Last Glacial Maximum was very different from today, with high-nutrient (low d13C, high Cd) deep Southern Ocean Water (SOW) penetrating far into the North Atlantic. However, if some glacial d13C values are biased by productivity artifacts and/or air-sea exchange processes, then the existing d13C data may be consistent with the continual dominance of North Atlantic Deep Water (NADW). Cibicidoides wuellerstorfi Cd/Ca results presented here indicate that the glacial North Atlantic was strongly enriched in dissolved Cd below ~2500 m depth. If NADW formation was still vigorous relative to SOW formation, these data could be explained by either increased preformed nutrient levels in the high-latitude North Atlantic or by increased organic matter remineralization within lower NADW. High glacial Zn/Ca values in the same samples, however, are best explained by a substantially increased mixing with Zn-rich SOW. The cause was ... : C. kullenbergi and C. pachyderma Zn/Ca values may all be contaminated, or these species may have very high Zn partition coefficients. ...

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