Gutjahr, Marcus; Lippold, Jörg (2011): (Table S1) Neodymium isotopic results from ODP Site 172-1063 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.830725, Supplement to: Gutjahr, M; Lippold, J (2011): Early arrival of Southern Source Water in the deep North Atlantic prior to Heinrich event 2. Paleoceanography, 26(2), PA2101, https://doi.org/10.1029/2011PA002114
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Abstract:
The Atlantic Meridional Overturning Circulation (AMOC) plays an important role in the Northern Hemisphere climate system. Significant interest went into the question of how excessive freshwater input through melting of continental ice can affect its overturning vigor and, hence, heat supply, to higher northern latitudes. Such forcing can be tested by investigating its behavior during extreme iceberg discharge events into the open North Atlantic during the last glacial period, the so-called Heinrich events (HE). Here we present neodymium (Nd) isotope compositions of past seawater, a sensitive chemical water mass tag, extracted from sediments of Ocean Drilling Program Site 1063 in the western North Atlantic (Bermuda Rise), covering the period surrounding HE 2, the Last Glacial Maximum, and the early deglaciation. These data are compared with a record of the kinematic circulation tracer (231Pa/230Th)xs extracted from the same sediment core. Both tracers indicate significant circulation changes preceding intense ice rafting during HE 2 by almost 2 kyr. Moreover, the Nd isotope record suggests the presence of deeply ventilating North Atlantic Deep Water early during Marine Isotope Stage 2 until it was replaced by Southern Source Water at ~27 ka. The early switch to high (Pa/Th)xs and radiogenic epsilon-Nd in relation to intensified ice rafting during HE 2 suggests that ice rafting into the open North Atlantic during major HE 2 was preceded by an early change of the AMOC. This opens the possibility that variations in AMOC contributed to or even triggered the ice sheet instability rather than merely responding to it.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 33.686444 * Longitude: -57.615000
Date/Time Start: 1997-03-25T00:00:00 * Date/Time End: 1997-03-25T00:00:00
Minimum DEPTH, sediment/rock: 2.40 m * Maximum DEPTH, sediment/rock: 14.52 m
Event(s):
172-1063 * Latitude: 33.686444 * Longitude: -57.615000 * Date/Time: 1997-03-25T00:00:00 * Elevation: -4583.7 m * Penetration: 1155.8 m * Recovery: 1123.3 m * Location: Blake-Bahama Outer Ridge, North Atlantic Ocean * Campaign: Leg172 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 126 cores; 1155.8 m cored; 0 m drilled; 97.2% recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | AGE | Age | ka BP | Geocode | ||
| 3 | Neodymium-143/Neodymium-144 ratio | 143Nd/144Nd | Gutjahr, Marcus | 2009-04, Bristol University | ||
| 4 | Neodymium-143/Neodymium-144 ratio, error | 143Nd/144Nd e | ± | Gutjahr, Marcus | 2009-04, Bristol University | |
| 5 | ε-Neodymium | ε-Nd | Gutjahr, Marcus | 2009-04, Bristol University | ||
| 6 | Neodymium-143/Neodymium-144 ratio | 143Nd/144Nd | Gutjahr, Marcus | 2009-07, University of Heidelberg | ||
| 7 | Neodymium-143/Neodymium-144 ratio, error | 143Nd/144Nd e | ± | Gutjahr, Marcus | 2009-07, University of Heidelberg | |
| 8 | ε-Neodymium | ε-Nd | Gutjahr, Marcus | 2009-07, University of Heidelberg | ||
| 9 | Neodymium-143/Neodymium-144 ratio | 143Nd/144Nd | Gutjahr, Marcus | 2009-08, Bristol University | ||
| 10 | Neodymium-143/Neodymium-144 ratio, error | 143Nd/144Nd e | ± | Gutjahr, Marcus | 2009-08, Bristol University | |
| 11 | ε-Neodymium | ε-Nd | Gutjahr, Marcus | 2009-08, Bristol University | ||
| 12 | Neodymium-143/Neodymium-144 ratio | 143Nd/144Nd | Gutjahr, Marcus | 2009-08, University of Heidelberg | ||
| 13 | Neodymium-143/Neodymium-144 ratio, error | 143Nd/144Nd e | ± | Gutjahr, Marcus | 2009-08, University of Heidelberg | |
| 14 | ε-Neodymium | ε-Nd | Gutjahr, Marcus | 2009-08, University of Heidelberg | ||
| 15 | Neodymium-143/Neodymium-144 ratio | 143Nd/144Nd | Gutjahr, Marcus | 2009-11, Bristol University | ||
| 16 | Neodymium-143/Neodymium-144 ratio, error | 143Nd/144Nd e | ± | Gutjahr, Marcus | 2009-11, Bristol University | |
| 17 | ε-Neodymium | ε-Nd | Gutjahr, Marcus | 2009-11, Bristol University | ||
| 18 | Neodymium-143/Neodymium-144 ratio | 143Nd/144Nd | Gutjahr, Marcus | 2009-11, University of Heidelberg | ||
| 19 | Neodymium-143/Neodymium-144 ratio, error | 143Nd/144Nd e | ± | Gutjahr, Marcus | 2009-11, University of Heidelberg | |
| 20 | ε-Neodymium | ε-Nd | Gutjahr, Marcus | 2009-11, University of Heidelberg | ||
| 21 | Number of measurements | n | # | Gutjahr, Marcus | ||
| 22 | ε-Neodymium | ε-Nd | Gutjahr, Marcus | averaged |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
376 data points