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  • 2020-2024  (4)
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  • 1
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    Climate Induced Thermocline Aging and Ventilation in the Eastern Atlantic Over the Last 32,000 Years (2023)
    Details
    Publication Date: 2024-04-02
    Description: 〈title xmlns:mml="http://www.w3.org/1998/Math/MathML"〉Abstract〈/title〉〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉The radiocarbon analysis of uranium‐thorium‐dated cold‐water corals (CWCs) provides an excellent opportunity for qualitative reconstruction of past ocean circulation and water mass aging. While mid‐depth water mass aging has been studied in the Atlantic Ocean, the evolution of the thermocline is still largely unknown. Here we present a combined 〈sup〉14〈/sup〉C and 〈sup〉230〈/sup〉Th/U age record obtained from thermocline dwelling CWCs at various sites in the eastern Atlantic Ocean, with intermittently centennial resolution over the last 32 ka. Shallow dwelling CWCs off Angola, located in the South Atlantic, infer a link between the mid‐depth equatorial Atlantic and Southern Ocean. They confirm a 〈sup〉14〈/sup〉C drawdown during the Last Glacial Maximum (LGM) and advocate for a consistent Southern Hemisphere radiocarbon aging of upper thermocline waters, as well as strong depth gradients and high variability. Direct comparison with 〈sup〉14〈/sup〉C simulations carried out with an Ocean General Circulation Model yield good agreement for Angola. In contrast, the North Atlantic thermocline shows well‐ventilated water with strong variations near the position of today's Azores Front (AF), neither of which are captured by the model. During the Bølling‐Allerød, we confirm the important role of the AF in separating North and South Atlantic thermocline waters and provide further evidence of a 500 year long deep convection interruption within the Younger Dryas (YD). We conclude that the North and South Atlantic thermocline waters were separately acting carbon reservoirs during the LGM and subsequent deglaciation until the modern circulation was established during the YD.〈/p〉
    Description: Key Points: 〈list list-type="bullet"〉 〈list-item〉 〈p xml:lang="en"〉North Atlantic cold‐water corals trace well‐ventilated thermocline waters near major oceanic fronts since the Last Glacial Maximum〈/p〉〈/list-item〉 〈list-item〉 〈p xml:lang="en"〉Across the South Atlantic into the Southern Ocean, aged waters with large variability and connectivity are evident during the last glacial〈/p〉〈/list-item〉 〈list-item〉 〈p xml:lang="en"〉The modern state of radiocarbon ventilation of the thermocline Atlantic is initiated during the Younger Dryas cold reversal〈/p〉〈/list-item〉 〈/list〉 〈/p〉
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Description: German Ministry of Education and Research
    Description: DFG‐ANR
    Description: PalMod project
    Description: https://doi.org/10.1594/PANGAEA.959508
    Keywords: 14C dating ; 230Th/U dating ; Alboran Sea ; Angola ; Atlantic ; Azores Front ; Batm age ; cold-water coral ; Mauritania ; ventilation ; radiocarbon dating ; U/Th
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
  • 2
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    Cold-water coral Atlantic thermocline ventilation records over the last 32,000 years (2023)
    PANGAEA
    Details
    Publication Date: 2023-09-23
    Description: The radiocarbon analysis of uranium-thorium-dated cold-water corals (CWCs) provides an excellent opportunity for qualitative reconstruction of past ocean circulation and water mass aging. While mid-depth water mass aging has been studied in the Atlantic Ocean, the evolution of the thermocline, tightly coupled to the atmosphere, is still largely unknown. Here we present a combined 14C and 230Th/U age record obtained from thermocline dwelling CWCs with partially centennial resolution over the last 32 ka at various locations in the central and east Atlantic Ocean (Azores Front, Mauritania, Angola), as well as in the Alboran Sea.
    Keywords: 14C dating; 230Th/U dating; Alboran Sea; Angola; Atlantic; Azores Front; Batm age; cold-water coral; Mauritania; radiocarbon dating; U/Th; ventilation
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 3
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    Radiocarbon dating of Atlantic cold-water corals over the last 32,000 years (2023)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Description: The radiocarbon analysis of uranium-thorium-dated cold-water corals (CWCs) provides an excellent opportunity for qualitative reconstruction of past ocean circulation and water mass aging. While mid-depth water mass aging has been studied in the Atlantic Ocean, the evolution of the thermocline, tightly coupled to the atmosphere, is still largely unknown. Here we present a combined 14C and 230Th/U age record obtained from thermocline dwelling CWCs with partially centennial resolution over the last 32 ka at various locations in the central and east Atlantic Ocean (Azores Front, Mauritania, Angola), as well as in the Alboran Sea. Preparation for radiocarbon dating took place at the Institute of Environmental Physics, Heidelberg University, Germany (Therre et al., 2021). The samples were measured on an accelerator mass spectrometer (MICADAS) at the Curt-Engelhorn Center for Archaeometry in Mannheim, Germany (Kromer et al., 2013, Synal et al., 2007).
    Keywords: 1057-2; 1065-1; 1070-2; 1071-2; 14C dating; 230Th/U dating; Age, 14C AMS, Mini Carbon Dating System (MICADAS); Age, dated; Age, Uranium-Thorium; Alboran Sea; Alboran Sea - E-Melilla - Brittlestar Ridge I; Angola; Area/locality; Atlantic; Azores Front; Banda mounds; Batm age; Benthic-atmosphere age; Calendar age; Calendar age, standard deviation; Campaign of event; Canyon S of Timiris mound chain; cold-water coral; Comment; Core; Date/Time of event; ELEVATION; EUROFLEETS; Event label; Fraction modern carbon; Fraction modern carbon, standard deviation; GC; GeoB14884-1; GeoB14890-2; GeoB14899-1; GeoB14904-2; GeoB14905-2; GeoB18118-1; GeoB18118-2; GeoB20908-2; GeoB20928-1; GeoB20933-1; GeoB20935-1; GeoB20953-2; GeoB20955-1; GeoB20958-1; GeoB23109-1; GeoB23110-1; GeoB23112-1; GeoB23113-1; GeoB23120-1; GeoB23121-1; GeoB23147-1; GeoB23153-1; GeoB23404-1; GeoB23415-1; GeoB23425-1; GeoB23429-1; GeoB23436-1; GeoB23437-1; Giant box corer; GKG; Grab; GRAB; Gravity corer; Laboratory code/label; Latitude of event; Location; Longitude of event; M122; M122_091-2; M122_111-1; M122_116-1; M122_118-1; M122_137-2; M122_139-1; M122_142-1; M151; M151_100-1; M151_10-1; M151_110-1; M151_114-1; M151_12-1; M151_121-1; M151_122-1; M151_13-1; M151_20-1; M151_21-1; M151_47-1; M151_53-1; M151_89-1; M151_9-1; Maria S. Merian; Marion Dufresne (1995); Mauritania; MD13-3455G; MD13-3459G; MD194; Mean values of ellipses; MeBo70; Meteor (1986); Method/Device of event; MSM16/3; MSM16/3_1051-1; MSM36; northern Banda slide; radiocarbon dating; Remotely operated vehicle SQUID; ROV SQUID; U/Th; ventilation; Δ14C; ΔΔ14C
    Type: Dataset
    Format: text/tab-separated-values, 1840 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 4
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    Uranium-thorium dating of Atlantic cold-water corals from the last 32,000 years (2023)
    PANGAEA
    Details
    Publication Date: 2024-02-27
    Description: Uranium-thorium dating offers the possibility of absolute age determination of cold-water corals (CWCs). We present here the complementary dataset to "Radiocarbon dating of Atlantic cold-water corals over the last 32.000 years". It contains 230Th/U ages obtained on CWCs from various locations in the central and east Atlantic Ocean, as well as the Alboran Sea. It also includes an update of previously published data, necessitated by a recently discovered "ghost signal" (Kerber et al., 2023). U and Th were extracted according to the method of Wefing et al. (2017). The high precision isotopic measurements were performed on a multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS, Thermo Fisher Neptune Plus) at the Institute of Environmental Physics, Heidelberg University, Germany. For age calculations the half-lives of 234U and 230Th published in (Cheng et al., 2013) were used. The mass spectrometry setup and data treatment follows the methods recently updated in great detail by Kerber et al. (2023).
    Keywords: 1057-2; 1065-1; 1070-2; 1071-2; 14C dating; 230Th/U dating; Age, dated; Age, dated standard deviation; Age, Uranium-Thorium, corrected; Age, Uranium-Thorium, uncorrected; Alboran Sea; Alboran Sea - E-Melilla - Brittlestar Ridge I; Angola; Area/locality; Atlantic; Azores Front; Banda mounds; Batm age; Campaign of event; Canyon S of Timiris mound chain; cold-water coral; Core; Date/Time of event; DEPTH, sediment/rock; ELEVATION; EUROFLEETS; Event label; GC; GeoB14884-1; GeoB14890-2; GeoB14899-1; GeoB14904-2; GeoB14905-2; GeoB18118-1; GeoB18118-2; GeoB20908-2; GeoB20928-1; GeoB20933-1; GeoB20935-1; GeoB20953-2; GeoB20955-1; GeoB20958-1; GeoB23109-1; GeoB23110-1; GeoB23112-1; GeoB23113-1; GeoB23120-1; GeoB23121-1; GeoB23147-1; GeoB23153-1; GeoB23404-1; GeoB23415-1; GeoB23425-1; GeoB23429-1; GeoB23436-1; GeoB23437-1; Giant box corer; GKG; Grab; GRAB; Gravity corer; iAtlantic; Integrated Assessment of Atlantic Marine Ecosystems in Space and Time; Laboratory code/label; Latitude of event; Location; Longitude of event; M122; M122_091-2; M122_111-1; M122_116-1; M122_118-1; M122_137-2; M122_139-1; M122_142-1; M151; M151_100-1; M151_10-1; M151_110-1; M151_114-1; M151_12-1; M151_121-1; M151_122-1; M151_13-1; M151_20-1; M151_21-1; M151_47-1; M151_53-1; M151_89-1; M151_9-1; Maria S. Merian; Marion Dufresne (1995); Mauritania; MD13-3455G; MD13-3459G; MD194; MeBo70; Meteor (1986); Method/Device of event; MSM16/3; MSM16/3_1051-1; MSM36; northern Banda slide; radiocarbon dating; Reference/source; Remotely operated vehicle SQUID; ROV SQUID; Species; Thorium-230/Thorium-232, standard deviation; Thorium-230/Thorium-232 ratio; Thorium-230/Uranium-238, standard deviation; Thorium-230/Uranium-238 ratio; Thorium-232; Thorium-232, standard deviation; U/Th; Uranium-238; Uranium-238, standard deviation; ventilation; δ234 Uranium; δ234 Uranium, standard deviation; δ234 Uranium (0); δ234 Uranium (0), standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 2609 data points
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    DATA PANGAEA
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