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  • 1
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    Lessons from a high-CO2 world: an ocean view from ∼ 3 million years ago (2020)
    Copernicus
    In:  EPIC3Climate of the Past, Copernicus, 16(4), pp. 1599-1615, ISSN: 1814-9332
    Details
    Publication Date: 2021-02-16
    Description: A range of future climate scenarios are projected for high atmospheric CO2 concentrations, given uncertainties over future human actions as well as potential environmental and climatic feedbacks. The geological record offers an opportunity to understand climate system response to a range of forcings and feedbacks which operate over multiple temporal and spatial scales. Here, we examine a single interglacial during the late Pliocene (KM5c, ca. 3.205±0.01 Ma) when atmospheric CO2 exceeded pre-industrial concentrations, but were similar to today and to the lowest emission scenarios for this century. As orbital forcing and continental configurations were almost identical to today, we are able to focus on equilibrium climate system response to modern and near-future CO2. Using proxy data from 32 sites, we demonstrate that global mean sea-surface temperatures were warmer than pre-industrial values, by ∼2.3°C for the combined proxy data (foraminifera Mg∕Ca and alkenones), or by ∼3.2–3.4°C (alkenones only). Compared to the pre-industrial period, reduced meridional gradients and enhanced warming in the North Atlantic are consistently reconstructed. There is broad agreement between data and models at the global scale, with regional differences reflecting ocean circulation and/or proxy signals. An uneven distribution of proxy data in time and space does, however, add uncertainty to our anomaly calculations. The reconstructed global mean sea-surface temperature anomaly for KM5c is warmer than all but three of the PlioMIP2 model outputs, and the reconstructed North Atlantic data tend to align with the warmest KM5c model values. Our results demonstrate that even under low-CO2 emission scenarios, surface ocean warming may be expected to exceed model projections and will be accentuated in the higher latitudes.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 2
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    Stepwise Weakening of the Pliocene Leeuwin Current (2021)
    Details
    Publication Date: 2021-11-30
    Description: The Indonesian Throughflow (ITF) operates as an important link in global thermohaline circulation, and ITF variability probably modulated Pliocene climate change. Yet, whether ITF variability accounted for oceanographic change south of Northwest Cape remains controversial. Here, we present a multiproxy oceanographic reconstruction from the Perth Basin and reconstruct the Pliocene history of the Leeuwin Current (LC). We show that the LC was active throughout the Pliocene, albeit with fluctuations in intensity and scope. Three main factors controlled LC strength. First, a tectonic ITF reorganization caused an abrupt and permanent LC reduction at 3.7 Ma. On shorter timescales, eustatic sea level and direct orbital forcing of wind patterns hampered or promoted the LC. At 3.3 Ma, for instance, LC intensity plunged in response to a eustatic ITF restriction. Site U1459 then fell outside the extent of a weakened LC, and the latitudinal sea surface temperature gradient along West Australia doubled its steepness.
    Keywords: 551 ; Perth Basin ; sediment core ; multiproxy geochemical records ; Pliocene ; Leeuwin Current (LC)
    Language: English
    Type: map
    Location Call Number Limitation Availability
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    CITATION GEO-LEO
  • 3
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    Biomarkers (TEX86), planktic isotopes and XRF records of IODP Site 356-U1459 (Perth Basin) (2019)
    PANGAEA
    In:  Supplement to: De Vleeschouwer, David; Petrick, Benjamin F; Martínez‐García, Alfredo (2019): Stepwise weakening of the Pliocene Leeuwin Current. Geophysical Research Letters, 46(14), 8310-8319, https://doi.org/10.1029/2019GL083670
    Details
    Publication Date: 2023-02-24
    Description: The Indonesian Throughflow (ITF) operates as an important link in global thermohaline circulation and ITF variability probably modulated Pliocene climate change. Yet, whether ITF variability accounted for oceanographic change south of Northwest Cape remains controversial. Here, we present a multi-proxy oceanographic reconstruction from the Perth Basin and reconstruct the Pliocene history of the Leeuwin Current (LC). We affirm the LC to be active throughout the Pliocene, albeit with fluctuations in intensity and scope. Three main factors control LC strength. First, a tectonic ITF reorganization caused an abrupt and permanent LC reduction at 3.7 Ma. On shorter time-scales, eustatic sea-level and direct orbital forcing of wind patterns hamper or promote the LC. At 3.3 Ma, for instance, LC intensity plunged in response to a eustatic ITF restriction. At that time, Site U1459 fell outside the extent of a weakened LC and the latitudinal sea surface temperature gradient became significantly steeper.
    Keywords: Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Biomarkers (TEX86) of IODP Hole 356-U1459B (2019)
    PANGAEA
    Details
    Publication Date: 2023-07-10
    Keywords: 356-U1459B; Acyclic glycerol dialkyl glycerol tetraether, fractional abundance; AGE; Branched and isoprenoid tetraether index; Confidence interval; Crenarchaeol, fractional abundance; Crenarchaeol isomer, fractional abundance; Depth, composite; DEPTH, sediment/rock; Dicyclic glycerol dialkyl glycerol tetraether, fractional abundance; DRILL; Drilling/drill rig; EXP356; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Monocyclic glycerol dialkyl glycerol tetraether, fractional abundance; Sample code/label; Sea surface temperature, annual mean; SST, from TEX86H (Kim et al., 2010); SST, from TEXH86, BAYSPAR (BAYesian SPAtially-varying Regression) (Tierney and Tingley, 2014, 2015); Tetraether index of 86 carbon atoms; Tricyclic glycerol dialkyl glycerol tetraether, fractional abundance
    Type: Dataset
    Format: text/tab-separated-values, 840 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    X-ray fluorescence (XRF) records of IODP Site 356-U1459 (2019)
    PANGAEA
    Details
    Publication Date: 2023-07-10
    Keywords: 356-U1459A; 356-U1459B; AGE; Aluminium, area, total counts; Argon, area, total counts; Barium, area, total counts; Calcium, area, total counts; Calcium/Iron ratio; Chloride, area, total counts; Chromium, area, total counts; Depth, composite; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Event label; EXP356; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Iron, area, total counts; Joides Resolution; Magnesium, area, total counts; Manganese, area, total counts; Potassium, area, total counts; Potassium/Aluminium ratio; Sample code/label; Silicon, area, total counts; Sulfur, area, total counts; Titanium, area, total counts
    Type: Dataset
    Format: text/tab-separated-values, 72012 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    δ¹³C and δ¹⁸O isotopes measured on planktic foraminifera of IODP Hole 356-U1459B (2019)
    PANGAEA
    Details
    Publication Date: 2023-07-10
    Keywords: 356-U1459B; AGE; Depth, composite; DEPTH, sediment/rock; DRILL; Drilling/drill rig; EXP356; Foraminifera, planktic δ13C; Foraminifera, planktic δ18O; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 572 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    Compiled Mg/Ca data from PlioVAR (2023)
    PANGAEA
    Details
    Publication Date: 2023-12-18
    Keywords: 130-806A; 130-806B; 165-999A; 184-1143B; 184-1143C; 202-1241; 202-1241A; 202-1241B; 202-1241C; 22-214; 306-U1313B; 306-U1313C; Age; alkenone SST; benthic and planktonic foraminifers; Caribbean Sea; COMPCORE; Composite Core; d18O of planktic foraminifera; Date/Time of event; Depth, composite; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Exp306; Extracted from PlioVAR KM5c SST Database; Foraminifera, planktic, Magnesium/Calcium ratio; foraminifera oxygen isotopes; From literature; Glomar Challenger; Indian Ocean//RIDGE; Joides Resolution; Latitude of event; Leg130; Leg165; Leg184; Leg202; Leg22; Literature search; Longitude of event; Mg/Ca-based sea surface temperature; North Atlantic Climate 2; Northern Hemisphere glaciation; North Pacific Ocean; PAGES_PlioVAR; Pleistocene; Pliocene; PlioVAR - Pliocene climate variability over glacial-interglacial timescales; Reference/source; Sample code/label; Sea surface temperature; Site; South China Sea; Species, unique identification; Species, unique identification (Semantic URI); Species, unique identification (URI); Uniform resource locator/link to raw data file; Uniform resource locator/link to reference
    Type: Dataset
    Format: text/tab-separated-values, 26274 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 8
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    Compiled planktonic d18O data from PlioVAR (2023)
    PANGAEA
    Details
    Publication Date: 2024-02-19
    Keywords: 114-704A; 114-704B; 161-978A; 165-999A; 184-1143A; 184-1143B; 184-1143C; 184-1148A; 184-1148B; 22-214; 306-U1313B; 306-U1313C; Age; Alboran Sea; alkenone SST; benthic and planktonic foraminifers; Caribbean Sea; d18O of planktic foraminifera; Depth, composite; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Event label; Exp306; Extracted from PlioVAR KM5c SST Database; Foraminifera, planktic δ18O; foraminifera oxygen isotopes; From literature; Glomar Challenger; Indian Ocean//RIDGE; Joides Resolution; Leg114; Leg161; Leg165; Leg184; Leg22; Literature search; Mg/Ca-based sea surface temperature; North Atlantic Climate 2; Northern Hemisphere glaciation; PAGES_PlioVAR; Pleistocene; Pliocene; PlioVAR - Pliocene climate variability over glacial-interglacial timescales; Reference/source; Sample code/label; Sample ID; Site; South Atlantic Ocean; South China Sea; Species, unique identification; Uniform resource locator/link to raw data file; Uniform resource locator/link to reference
    Type: Dataset
    Format: text/tab-separated-values, 35788 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 9
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    Synthesis of sea surface temperature and foraminifera stable isotope data spanning the mid-Pliocene warm period and early Pleistocene (PlioVAR) (2023)
    PANGAEA
    Details
    Publication Date: 2023-12-11
    Description: The Pliocene Epoch (~2.6–5.3 million years ago, Ma) was characterized by a warmer than present climate with smaller Northern Hemisphere ice sheets, and therefore offers an example of a climate system in long-term equilibrium with current or predicted near-future carbon dioxide concentrations. The end of the Pliocene (~2.6 Ma) is marked by further ice-sheet expansion and intensification of glacial (cold) stages, referred to as the "intensification of Northern Hemisphere Glaciation" (iNHG). Here we present the data used to assess the spatial and temporal variability of ocean temperatures and ice-volume indicators through the late Pliocene and early Pleistocene (from 3.3 to 2.4 Ma) to determine the character of this climate transition. The data come from the Atlantic, Pacific, Indian and Southern Ocean, as well as some marginal seas. Here we present the synthesized alkenone sea-surface temperature, Mg/Ca sea-surface temperature, planktonic foraminifera d18O and benthic foraminifera d18O data which were used in our synthesis. Although the original data sets are largely published, here we present the alkenone SST records calculated using the BAYSPLINE calibration where these were not part of the original publication; the Mg/Ca-SST records where we revised the absolute SSTs; any data sets where we revised the age model.
    Keywords: alkenone SST; benthic and planktonic foraminifers; d18O of planktic foraminifera; foraminifera oxygen isotopes; Mg/Ca-based sea surface temperature; Northern Hemisphere glaciation; PAGES_PlioVAR; Pleistocene; Pliocene; PlioVAR - Pliocene climate variability over glacial-interglacial timescales
    Type: Dataset
    Format: application/zip, 7 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 10
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    PlioVAR sea surface temperature (SST) anomaly calculation (2023)
    PANGAEA
    Details
    Publication Date: 2023-12-11
    Keywords: 108-662; 117-722; 130-806; 138-846; 162-907; 162-982; 165-999; 167-1012; 175-1082; 175-1087; 177-1090; 184-1143; 202-1241; 22-214; 306-U1313; 321-U1337; 341-U1417; 356-U1463; 90-593; 90-594; alkenone SST; Arabian Sea; Benguela Current, South Atlantic Ocean; benthic and planktonic foraminifers; Calculated; Caribbean Sea; COMPCORE; Composite Core; d18O of planktic foraminifera; Date/Time of event; DRILL; Drilling/drill rig; Event label; Exp306; Exp321; Exp341; EXP356; foraminifera oxygen isotopes; Glomar Challenger; Iceland Sea; Indian Ocean//RIDGE; Italy; Joides Resolution; Latitude of event; Leg108; Leg117; Leg130; Leg138; Leg162; Leg165; Leg167; Leg175; Leg177; Leg184; Leg202; Leg22; Leg90; Longitude of event; Mg/Ca-based sea surface temperature; North Atlantic Climate 2; Northern Hemisphere glaciation; North Pacific Ocean; OUTCROP; Outcrop sample; Pacific Equatorial Age Transect II / Juan de Fuca; PAGES_PlioVAR; Pleistocene; Pliocene; PlioVAR - Pliocene climate variability over glacial-interglacial timescales; Proxy; Punta_Piccola; Sea surface temperature; Sea surface temperature, anomaly; Site; South Atlantic Ocean; South China Sea; Southern Alaska Margin: Tectonics, Climate and Sedimentation; South Pacific/CONT RISE; South Pacific/Tasman Sea/PLATEAU; South Pacific Ocean
    Type: Dataset
    Format: text/tab-separated-values, 594 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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