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  • 1
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    GEOTRACES intercalibration of neodymium isotopes and rare earth element concentrations in seawater and suspended particles. Part 1: reproducibility of results for the international intercomparison (2012)
    In:  EPIC3Limnology and Oceanography: Methods, 10(4), pp. 234-251, ISSN: 15415856
    Details
    Publication Date: 2018-03-12
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 2
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    Ice-sheet driven weathering input and water mass mixing in the Nordic Seas during the last 25,000 years (2019)
    In:  EPIC3Earth and Planetary Science Letters, 514, pp. 108-118, ISSN: 0012821X
    Details
    Publication Date: 2019-03-31
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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  • 3
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    Antarctic intermediate water circulation in the South Atlantic over the past 25,000 years (2016)
    John Wiley & Sons
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2016. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 31 (2016): 1302–1314, doi:10.1002/2016PA002975.
    Description: Antarctic Intermediate Water is an essential limb of the Atlantic meridional overturning circulation that redistributes heat and nutrients within the Atlantic Ocean. Existing reconstructions have yielded conflicting results on the history of Antarctic Intermediate Water penetration into the Atlantic across the most recent glacial termination. In this study we present leachate, foraminiferal, and detrital neodymium isotope data from three intermediate-depth cores collected from the southern Brazil margin in the South Atlantic covering the past 25 kyr. These results reveal that strong chemical leaching following decarbonation does not extract past seawater neodymium composition in this location. The new foraminiferal records reveal no changes in seawater Nd isotopes during abrupt Northern Hemisphere cold events at these sites. We therefore conclude that there is no evidence for greater incursion of Antarctic Intermediate Water into the South Atlantic during either the Younger Dryas or Heinrich Stadial 1. We do, however, observe more radiogenic Nd isotope values in the intermediate-depth South Atlantic during the mid-Holocene. This radiogenic excursion coincides with evidence for a southward shift in the Southern Hemisphere westerlies that may have resulted in a greater entrainment of radiogenic Pacific-sourced water during intermediate water production in the Atlantic sector of the Southern Ocean. Our intermediate-depth records show similar values to a deglacial foraminiferal Nd isotope record from the deep South Atlantic during the Younger Dryas but are clearly distinct during the Last Glacial Maximum and Heinrich Stadial 1, demonstrating that the South Atlantic remained chemically stratified during Heinrich Stadial 1.
    Description: NERC Grant Numbers: NE/K005235/1, NE/F006047/1; NSF Grant Number: OCE -1335191; FAPESP Grant Number: 2012/17517-3; CAPES Grant Numbers: 1976/2014, 564/2015
    Description: 2017-04-05
    Keywords: Antarctic Intermediate Water ; Neodymium isotopes ; Degalciation ; South Atlantic
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 4
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    The co-evolution of Black Sea level and composition through the last deglaciation and its paleoclimatic significance (2006)
    Details
    Publication Date: 2022-05-26
    Description: Author Posting. © Elsevier B.V., 2006. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Quaternary Science Reviews 25 (2006): 2031-2047, doi:10.1016/j.quascirev.2006.01.032.
    Description: The strontium and oxygen isotopic compositions of carbonate shells are a measure of the water delivered to the Black Sea lake since the last glacial maximum. Commencing at ~18 ka BP cal with the arrival of substantial meltwater from the Alpine and northern European ice sheets and overflow via the Caspian Sea from the disintegrating Siberian ice cover, the 87Sr/86Sr ratio rose rapidly from a glacial minima around 0.7087 to reach a set of peaks near 0.7091 in layers of conspicuous reddish-brown clay with a mineralogy of Eurasian provenance. The 87Sr/86Sr ratio oscillates between high in the red-brown layers to low in interbedded gray clays with glacial era mineralogy, indicative that the meltwater came in pulses. On the other hand, the rise of the δ18O ratio from glacial low values of -7 per mil was delayed until15.2 ka BP cal, after the last meltwater pulse. The rising δ18O of the Black Sea lake corresponds with two episodes of calcite precipitation whose interruption corresponds to the Younger Dryas cold period. During each interval of calcite precipitation the δ18O increased a further 2 per mil, without variation in the 87Sr/86Sr composition. During cooling the 87Sr/86Sr ratio trended back toward its glacial value with little change in the δ18O. The disparity between the Sr and O isotope behavior demonstrates that δ18O is not simply a signal of end-member mixing, but instead the δ18O record reflects changes in atmospheric moisture delivered to the Black Sea watershed. At 9.4 ka BP cal the 87Sr/86Sr composition shifted to that of the global ocean and remained there to the present. Since lake water is significantly depleted in strontium relative to seawater, any earlier leakage from the Mediterranean should have left a corresponding signal.
    Description: Supported by grant OCE 97-11320 of the US National Science Foundation and a Grant in aid of research from Sigma Xi (to Major).
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
    Format: 2418564 bytes
    Format: 1042376 bytes
    Format: application/pdf
    Format: application/pdf
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  • 5
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    North Atlantic ocean circulation and abrupt climate change during the last glaciation (2016)
    Details
    Publication Date: 2022-05-26
    Description: Author Posting. © The Author(s), 2016. This is the author's version of the work. It is posted here by permission of American Association for the Advancement of Science for personal use, not for redistribution. The definitive version was published in Science 353 (2016): 470-474, doi:10.1126/science.aaf5529.
    Description: The most recent ice age was characterized by rapid and hemispherically asynchronous climate oscillations, whose origin remains unresolved. Variations in oceanic meridional heat transport may contribute to these repeated climate changes, which were most pronounced during the glacial interval twenty-five to sixty thousand years ago known as marine isotope stage 3 (MIS3). Here we examine a sequence of climate and ocean circulation proxies throughout MIS3 at high resolution in a deep North Atlantic sediment core, combining the kinematic tracer Pa/Th with the most widely applied deep water-mass tracer, δ13CBF. These indicators reveal that Atlantic overturning circulation was reduced during every cool northern stadial, with the greatest reductions during episodic iceberg discharges from the Hudson Strait, and that sharp northern warming followed reinvigorated overturning. These results provide direct evidence for the ocean's persistent, central role in abrupt glacial climate change.
    Description: This research was supported in part by a NSF Graduate Research Fellowship to L.G.H, by awards from the Comer Science and Education Foundation and NSF ATM-0936496 to J.F.M., and an award from the LDEO Climate Center to L.G.H. and J.F.M. LDK and WBC were supported by ATM-0836472, and LDK was supported by AGS 1548160.
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
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  • 6
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    (Table A1) Age model of BOFS sediment cores 28K-32K (2017)
    PANGAEA
    Details
    Publication Date: 2023-04-28
    Keywords: Age, 14C AMS; Age, dated; Age, dated material; Age, dated standard deviation; Biogeochemical Ocean Flux Study; BOFS; BOFS28/3K; BOFS28#3; BOFS29/1K; BOFS29#1; BOFS30/3K; BOFS30#3; BOFS31/1K; BOFS31#1; BOFS32/4K; BOFS32#4; Calendar age; Calibration; CD53; Charles Darwin; Comment; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Event label; Identification; KAL; Kasten corer; Northeast Atlantic
    Type: Dataset
    Format: text/tab-separated-values, 226 data points
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    DATA PANGAEA
  • 7
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    Geochemistry of Ninetyeast Ridge basaltic glasses
    PANGAEA
    In:  Supplement to: Frey, Frederick A; Pringle, Malcolm S; Meleney, P; Huang, S; Piotrowski, Alexander M (2011): Diverse mantle sources for Ninetyeast Ridge magmatism: Geochemical constraints from basaltic glasses. Earth and Planetary Science Letters, 303(3-4), 215-224, https://doi.org/10.1016/j.epsl.2010.12.051
    Details
    Publication Date: 2023-05-12
    Description: The Ninetyeast Ridge (NER), a north-south striking, 5,000 km long, 77 to 43 Ma chain of basaltic submarine volcanoes in the eastern Indian Ocean formed as a hotspot track created by rapid northward migration of the Indian Plate over the Kerguelen hotspot. Based on the major and trace element contents of unaltered basaltic glasses from six locations along the NER, we show that the NER was constructed by basaltic magma derived from at least three geochemically distinct mantle sources: (1) a source enriched in highly incompatible elements relative to primitive mantle like the source of the 29-24 Ma flood basalts in the Kerguelen Archipelago; (2) an incompatible element-depleted source similar to the source of Mid-Ocean Ridge Basalt (MORB) erupted along the currently active Southeast Indian Ridge (SEIR); and (3) an incompatible element-depleted source that is compositionally and mineralogically distinct from the source of SEIR MORB. Specifically, this depleted mantle source was garnet-bearing and had higher Y/Dy and Nb/Zr, but lower Zr/Sm, than the SEIR MORB source. We infer that this third source formed as a garnet-bearing residue created during a previous melting event, perhaps an initial partial melting of the mantle hotspot. Subsequently, this residue partially melted over a large pressure range, from slightly over 3 GPa to less than 1 GPa, and to a high extent (~ 30%) thereby creating relatively high SiO2 and FeO contents in some NER basalts relative to SEIR MORB.
    Keywords: Deep Sea Drilling Project; DSDP
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 8
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    Foraminiferal, leachate and detrial neodymium isotopes from the South Atlantic
    PANGAEA
    In:  Supplement to: Howe, Jacob N W; Piotrowski, Alexander M; Oppo, Delia W; Huang, Kuo-Fang; Mulitza, Stefan; Chiessi, Cristiano Mazur; Blusztajn, Jurek (2016): Antarctic intermediate water circulation in the South Atlantic over the past 25,000 years. Paleoceanography, 31(10), 1302-1314, https://doi.org/10.1002/2016PA002975
    Details
    Publication Date: 2023-05-12
    Description: Antarctic Intermediate Water is an essential limb of the Atlantic meridional overturning circulation that redistributes heat and nutrients within the Atlantic Ocean. Existing reconstructions have yielded conflicting results on the history of Antarctic Intermediate Water penetration into the Atlantic across the most recent glacial termination. In this study we present leachate, foraminiferal, and detrital neodymium isotope data from three intermediate-depth cores collected from the southern Brazil margin in the South Atlantic covering the past 25?kyr. These results reveal that strong chemical leaching following decarbonation does not extract past seawater neodymium composition in this location. The new foraminiferal records reveal no changes in seawater Nd isotopes during abrupt Northern Hemisphere cold events at these sites. We therefore conclude that there is no evidence for greater incursion of Antarctic Intermediate Water into the South Atlantic during either the Younger Dryas or Heinrich Stadial 1. We do, however, observe more radiogenic Nd isotope values in the intermediate-depth South Atlantic during the mid-Holocene. This radiogenic excursion coincides with evidence for a southward shift in the Southern Hemisphere westerlies that may have resulted in a greater entrainment of radiogenic Pacific-sourced water during intermediate water production in the Atlantic sector of the Southern Ocean. Our intermediate-depth records show similar values to a deglacial foraminiferal Nd isotope record from the deep South Atlantic during the Younger Dryas but are clearly distinct during the Last Glacial Maximum and Heinrich Stadial 1, demonstrating that the South Atlantic remained chemically stratified during Heinrich Stadial 1.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 9
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    (Appendix 4) Nd and Mn concentration in mixed planktonic foraminifera of sediment cores BOFS10K and BOFS11K
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: BOFS10K; BOFS11890#2; BOFS11891#4; BOFS11K; D184; DEPTH, sediment/rock; Discovery (1962); Event label; KAL; Kasten corer; Manganese; Neodymium; Northeast Atlantic
    Type: Dataset
    Format: text/tab-separated-values, 38 data points
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  • 10
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    (Table S2) Epsilon-Nd data of planktic foraminifera of sediment core KNR159-36
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: AGE; Center for Marine Environmental Sciences; DEPTH, sediment/rock; Foraminifera, planktic ε-Neodymium; Foraminifera, planktic ε-Neodymium, standard deviation; GGC; Giant gravity corer; KN159-5; Knorr; KNR159-36; KNR159-5; KNR159-5-36GGC; MARUM; Neodymium-143/Neodymium-144 ratio; Western Atlantic
    Type: Dataset
    Format: text/tab-separated-values, 66 data points
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    DATA PANGAEA
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