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  • 2020-2024  (72)
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  • 1
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    An astronomically dated record of Earth’s climate and its predictability over the last 66 Million Years (2020)
    AAAS (American Association for the Advancement of Science)
    Details
    Publication Date: 2023-02-08
    Description: Much of our understanding of Earth’s past climate comes from the measurement of oxygen and carbon isotope variations in deep-sea benthic foraminifera. Yet, long intervals in existing records lack the temporal resolution and age control needed to thoroughly categorize climate states of the Cenozoic era and to study their dynamics. Here, we present a new, highly resolved, astronomically dated, continuous composite of benthic foraminifer isotope records developed in our laboratories. Four climate states—Hothouse, Warmhouse, Coolhouse, Icehouse—are identified on the basis of their distinctive response to astronomical forcing depending on greenhouse gas concentrations and polar ice sheet volume. Statistical analysis of the nonlinear behavior encoded in our record reveals the key role that polar ice volume plays in the predictability of Cenozoic climate dynamics.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Format: other
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    An astronomically dated record of Earth's climate and its predictability over the last 66 million years (2021)
    AAAS
    Details
    Publication Date: 2023-10-26
    Description: Much of our understanding of Earth's past climate comes from the measurement of oxygen and carbon isotope variations in deep-sea benthic foraminifera. Yet, long intervals in existing records lack the temporal resolution and age control needed to thoroughly categorize climate states of the Cenozoic era and to study their dynamics. Here, we present a new, highly resolved, astronomically dated, continuous composite of benthic foraminifer isotope records developed in our laboratories. Four climate states-Hothouse, Warmhouse, Coolhouse, Icehouse-are identified on the basis of their distinctive response to astronomical forcing depending on greenhouse gas concentrations and polar ice sheet volume. Statistical analysis of the nonlinear behavior encoded in our record reveals the key role that polar ice volume plays in the predictability of Cenozoic climate dynamics.
    Description: Published
    Description: 1383–1387
    Description: 5A. Ricerche polari e paleoclima
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 3
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    New Tie points, organic and inorganic data, growth rate and pCO2 reconstructions for the late Miocene Cooling of ODP Hole 177-1088B (2020)
    PANGAEA
    Details
    Publication Date: 2024-07-19
    Description: A pronounced late Miocene cooling (LMC) from 7 to 5.7 Ma has been documented in extratropical and tropical sea surface temperature records, but to date, available proxy evidence has not revealed a significant pCO2 decline over this event. Here, we provide a new, high resolution pCO2 proxy record over the late Miocene cooling based on alkenone carbon isotopic fractionation (εp) measured in sediments from the South Atlantic at ODP Site 1088. We apply a recent proxy calibration derived from a compilation of laboratory cultures, which more accurately reflects the proxy sensitivity to pCO2 changes during late Quaternary glacial-interglacial cycles, together with new micropaleontological proxies to reconstruct past variations in algal growth rate, an important secondary influence on the εp. Our resulting pCO2 record suggests a 2-3 fold decline over the late Miocene Cooling and confirms a strong coupling between climate and pCO2 through the late Miocene. Within this long-term trend are pCO2 variations on sub-myr timescales that may reflect 400kyr long-eccentricity cycles, in which pCO2 minima coincide with several orbital scale maxima in published high-resolution benthic 𝛿18O records. These may correspond to ephemeral glaciations, potentially in the Northern Hemisphere. Our temperature and planktonic 𝛿18O records from Site 1088 are consistent with substantial equatorward movement of Southern Ocean frontal systems during the LMC. This suggests that potential feedbacks between cooling, ocean circulation and deep ocean CO2 storage may warrant further investigation during the LMC.
    Keywords: Age model; Ocean Drilling Program; ODP; ODP Site 1088B
    Type: dataset bundled publication
    Format: application/zip, 6 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Age model, geochemistry, XRF core scanning elemental data and benthic foraminifera from IODP Site 371-U1506 (2023)
    PANGAEA
    Details
    Publication Date: 2024-07-19
    Description: The Late Miocene-Early Pliocene Biogenic Bloom (~9–3.5 Ma) was a paleoceanographic phenomenon defined by anomalously high accumulations of biological components at multiple open ocean sites, especially in certain regions of the Indian, and Pacific oceans. Its temporal and spatial extent with available information leaves fundamental questions about driving forces and responses unanswered. In this work, we focus on the middle part of the Biogenic Bloom (7.4–4.5 Ma) at International Ocean Discovery Program (IODP) Site 371-U1506 in the Tasman Sea, where we provide an integrated age model based on orbital tuning of the Natural Gamma Radiation (NGR), benthic foraminiferal oxygen isotopes, and calcareous nannofossil biostratigraphy. Benthic foraminiferal assemblages suggest changes in deep water oxygen concentration and seafloor nutrient supply during generally high export productivity conditions. From 7.4 Ma to 6.7 Ma, seafloor conditions were characterized by episodic nutrient supply, perhaps related to seasonal phytoplankton blooms. From 6.7 Ma to 4.5 Ma, the regime shifted to a more stable interval characterized by eutrophic and dysoxic conditions. Combined with seismic data, a regional change in paleoceanography is inferred at around 6.7 Ma, from stronger and well-oxygenated bottom currents to weaker, oxygen-depleted bottom currents. Our results support the hypothesis that the Biogenic Bloom was a complex, multiphase phenomenon driven by changes in ocean currents, rather than a single uniform period of sustained sea surface water productivity. Highly resolved studies are thus fundamental to its understanding and the disentanglement of local, regional, and global imprints.
    Keywords: Benthic foraminifera assemblages; Biogenic bloom; Calcareous nannofossils; Early Pliocene; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Late Miocene; Tasman Sea
    Type: dataset bundled publication
    Format: application/zip, 9 datasets
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    DATA PANGAEA
  • 5
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    Climate, cryosphere and carbon cycle controls on Southeast Atlantic orbital-scale carbonate deposition since the Oligocene (30-0 Ma) (2020)
    PANGAEA
    Details
    Publication Date: 2024-07-19
    Description: These are the supplementary datasets for the manuscript: Drury, A.J., Liebrand, D., Westerhold, T., Beddow, H., Hodell, D., Rohlfs, N., Wilkens, R.H., Lourens, L., 'History of South Atlantic carbonate deposition since the Oligocene (30-0 Ma)', in final preparation for submission Climate of the Past
    Keywords: Carbonate; IODP; Miocene; Ocean Drilling; Ocean Drilling Program; ODP; ODP Site 1264; ODP Site 1265; Oligocene; Pleistocene; Pliocene; South Atlantic
    Type: dataset publication series
    Format: application/zip, 25 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    Age model, carbonate mass accumulation rates and benthic foraminifera from ODP Site 175-1085 (2024)
    PANGAEA
    Details
    Publication Date: 2024-07-19
    Description: We conducted a study on the Late Miocene-Early Pliocene Biogenic Bloom, a phase of increased marine biological productivity that occurred approximately between 9 and 3.5 Ma. This phenomenon was observed worldwide in various ocean locations and was attributed to either a rise in nutrient input or a significant reorganization of nutrients within the oceans. Our focus was on the Biogenic Bloom at Ocean Drilling Program (ODP) Site 1085 in the Atlantic Ocean. We provided new biostratigraphic data to develop an updated age model and subsequently examined the variations observed in benthic foraminiferal assemblages throughout the Biogenic Bloom. At Site 1085, the Biogenic Bloom occurred between 8.1 and 3.0 Ma and we studied it employing various proxies, including linear sedimentation rates, carbonate mass accumulation rates, benthic foraminifera assemblage data and associated indexes (such as benthic foraminifera accumulation rate and diversity). We identified four distinct intervals within the Biogenic Bloom based on paleoenvironmental changes inferred from the benthic foraminiferal assemblages. Two intervals within the Biogenic Bloom, spanning from 8.1 to 5.2 Ma and from 3.8 to 3.0 Ma, indicated oligotrophic conditions with highly seasonal phytoplankton blooms. Between 5.2 and 4.8 Ma, we observed short-term fluctuations between well-oxygenated oligotrophic conditions and phases of low-oxygen eutrophic conditions. From 4.8 to 3.8 Ma, we noted a transition to a higher input of food supply to the seafloor. Our findings indicate that the onset of the Biogenic Bloom coincided with well-dated global records and its conclusion aligned with other records from the Atlantic Ocean. Furthermore, our research supports the hypothesis that the Biogenic Bloom should not be viewed as a single productivity event but rather as a complex occurrence comprising several shorter-lived high-productivity periods driven by different factors.
    Type: dataset bundled publication
    Format: application/zip, 7 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    Planktonic foraminifera counts and their oxygen and carbon isotopes at the IODP site 320-U1334 (2024)
    PANGAEA
    Details
    Publication Date: 2024-07-19
    Description: This dataset contains data from Integrated Ocean Drilling Program Site U1334, which is correlated in the depth domain to Site 1218 before ages were assigned. The dataset contains sample information (Expedition, Site, Hole, etc.), depth (for both Sites U1334 and 1218) and age information (i.e., Site U1334 Depth (CSF-A) (mbsf), Site U1334 Depth (revised CCSF-A) (rmcd), Site U1334 Depth (adjusted revised CCSF-A) (armcd), Site 1218 Depth (armcd) Age (ka) (CaCO3 tuned age model)), planktonic foraminiferal oxygen and carbon isotopes, and the necessary information to compute planktonic foraminiferal accumulation rates.
    Keywords: 320-U1334; Age, dated; Cibicidoides mundulus, δ13C; Cibicidoides mundulus, δ18O; COMPCORE; Composite Core; Core; Cruise/expedition; Density, dry bulk; Dentoglobigerina venezuelana; Dentoglobigerina venezuelana, δ13C; Dentoglobigerina venezuelana, δ18O; Depth, composite revised; Depth, composite revised, adjusted; Depth, section; DEPTH, sediment/rock; DSDP/ODP/IODP sample designation; Event label; Exp320; Expedition 320; Globigerinoides altiapertura; Globigerinoides altiapertura, δ13C; Globigerinoides altiapertura, δ18O; Globigerinoides primordius; Globigerinoides primordius, δ13C; Globigerinoides primordius, δ18O; Hole; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; IODP 320; Joides Resolution; Oridorsalis umbonatus, δ13C; Oridorsalis umbonatus, δ18O; Pacific Equatorial Age Transect I; Pacific Ocean; Paragloborotalia siakensis; Paragloborotalia siakensis, δ13C; Paragloborotalia siakensis, δ18O; PFAR; Planktonic foraminifera; Sample code/label; Sample mass; Section; Site; Site U1334; Type
    Type: dataset
    Format: text/tab-separated-values, 15551 data points
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    DATA PANGAEA
  • 8
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    Table 2: Revised offsets of ODP Hole 208-1264A (2020)
    PANGAEA
    Details
    Publication Date: 2024-07-19
    Keywords: 208-1264A; Carbonate; Depth, composite; Depth, composite revised; DEPTH, sediment/rock; DRILL; Drilling/drill rig; IODP; Joides Resolution; Leg208; Miocene; Ocean Drilling; Ocean Drilling Program; ODP; ODP Site 1264; ODP Site 1265; Offset; Offset change; Oligocene; Pleistocene; Pliocene; Sample code/label; South Atlantic; Walvis Ridge, Southeast Atlantic Ocean
    Type: dataset
    Format: text/tab-separated-values, 270 data points
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    DATA PANGAEA
  • 9
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    Table 2: Revised offsets of ODP Hole 208-1264C (2020)
    PANGAEA
    Details
    Publication Date: 2024-07-19
    Keywords: 208-1264C; Carbonate; Depth, composite; Depth, composite revised; DEPTH, sediment/rock; DRILL; Drilling/drill rig; IODP; Joides Resolution; Leg208; Miocene; Ocean Drilling; Ocean Drilling Program; ODP; ODP Site 1264; ODP Site 1265; Offset; Offset change; Oligocene; Pleistocene; Pliocene; Sample code/label; South Atlantic; Walvis Ridge, Southeast Atlantic Ocean
    Type: dataset
    Format: text/tab-separated-values, 9 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 10
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    Nannofossil counts from ODP Site 175-1085 (2024)
    PANGAEA
    Details
    Publication Date: 2024-07-19
    Keywords: 175-1085A; 175-1085B; Amaurolithus delicatus; Amaurolithus primus; Benguela Current, South Atlantic Ocean; Calcidiscus macintyrei; Ceratolithus acutus; Ceratolithus atlanticus; Ceratolithus cristatus; Counting; Date/Time of event; Depth, composite revised; DEPTH, sediment/rock; Discoaster asymmetricus; Discoaster berggrenii; Discoaster brouweri; Discoaster hamatus; Discoaster pentaradiatus; Discoaster quinqueramus; Discoaster tamalis; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Elevation of event; Event label; IODP Depth Scale Terminology; Joides Resolution; Latitude of event; Leg175; Longitude of event; Nickilithus amplificus; Orthorhabdus rugosus; Reticulofenestra pseudoumbilicus; Sample code/label; Sphenolithus moriformis
    Type: dataset
    Format: text/tab-separated-values, 1710 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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