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  • PANGAEA  (18)
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  • 1
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    (Table S2) I/Ca ratios, CaCO3 content and stable isotope rates of foraminifera at sediment cores PS2547-3 and JR179-TC493 (2018)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: AGE; Amundsen Sea; Amundsen Sea, continental rise (unnamed Marie Byrd Seamount); ANT-XI/3; Calcium carbonate; Cibicidoides cf. wuellerstorfi, δ13C; Cibicidoides cf. wuellerstorfi, δ18O; DEPTH, sediment/rock; Epistominella exigua; Event label; Gravity corer (Kiel type); Iodine/Calcium ratio; Iodine/Calcium ratio standard deviation; James Clark Ross; JR179; JR179-TC493; JR20080221; Neogloboquadrina pachyderma sinistral, δ13C; Neogloboquadrina pachyderma sinistral, δ18O; Polarstern; PS2547-3; PS29; PS29/063; SL; TC; TC493 CORE_NO 493; Trigger corer
    Type: Dataset
    Format: text/tab-separated-values, 536 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    (Table S2) I/Ca ratios, CaCO3 content and stable isotope rates of foraminifera at sediment cores PS2547-3 and JR179-TC493 (2016)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: AGE; Amundsen Sea; Amundsen Sea, continental rise (unnamed Marie Byrd Seamount); ANT-XI/3; Calcium carbonate; Cibicidoides cf. wuellerstorfi, δ13C; Cibicidoides cf. wuellerstorfi, δ18O; DEPTH, sediment/rock; Epistominella exigua; Event label; Gravity corer (Kiel type); Iodine/Calcium ratio; Iodine/Calcium ratio standard deviation; James Clark Ross; JR179; JR179-TC493; JR20080221; Neogloboquadrina pachyderma sinistral, δ13C; Neogloboquadrina pachyderma sinistral, δ18O; Polarstern; PS2547-3; PS29; PS29/063; SL; TC; TC493 CORE_NO 493; Trigger corer
    Type: Dataset
    Format: text/tab-separated-values, 536 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Comparing paleo-oxygenation proxies (benthic foraminiferal surface porosity, I/Ca, authigenic uranium) on modern sediments and the glacial Arabian Sea (2022)
    PANGAEA
    Details
    Publication Date: 2023-11-08
    Description: A total of 70 core-top samples and 24 down-core samples were used in this study. All sediment samples were taken from Woods Hole Oceanographic Institution (WHOI) Seafloor Samples Repository. For the core-top calibrations, samples were taken from the top 5 cm of most cores. Cores TN041-8PG and 8JPC are from the center of the modern Arabian Sea Oxygen Minimum Zone. Core 8PG was sampled every 16 cm from top to bottom (a total of 224 cm, extending to ~ 15.6 kyr BP). We extended the record of 8PG to ~30 kyr BP using 8JPC, which was also sampled at 16 cm intervals. All samples were freeze-dried and then aliquoted for bulk sediment geochemistry analyses. The rest of sediments were wet-sieved to 〉 63 µm fraction with de-ionized water, and oven-dried at 45°C. Benthic foraminifera Cibicidoides spp., Planulina sp., and Globobulimina affinis were picked from the 〉 212 µm fraction. Photos of benthic foraminifera were taken using a Scanning Electron Microscope (SEM) (Hitachi model TM3000) at WHOI. Benthic surface porosity was determined from the SEM photos. Benthic foraminifera I/Ca analyses and bulk sediment geochemistry were performed on a Thermo Scientific iCAP Qc ICP-MS at WHOI.
    Keywords: Arabian Sea; authigenic uranium; Benthic foraminifera; benthic surface porosity; Bottom-water oxygen; iodine/calcium
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    I/Ca and carbon and oxygen isotopes of N. pachyderma and C. cf. wuellerstorf at sediment cores PS2547-3 and JR179-TC493 (2016)
    PANGAEA
    In:  Supplement to: Lu, Zunli; Hoogakker, Babette A A; Hillenbrand, Claus-Dieter; Zhou, Xiaoli; Thomas, Ellen; Gutchess, Kristina M; Lu, Wanyi; Jones, Luke; Rickaby, Rosalind E M (2016): Oxygen depletion recorded in upper waters of the glacial Southern Ocean. Nature Communications, 7, 11146, https://doi.org/10.1038/ncomms11146
    Details
    Publication Date: 2024-01-09
    Description: Oxygen depletion in the upper ocean is commonly associated with poor ventilation and storage of respired carbon, potentially linked to atmospheric CO2 levels. Iodine to calcium ratios (I/Ca) in recent planktonic foraminifera suggest that values less than ~2.5 µmol/mol indicate the presence of O2-depleted water. Here we apply this proxy to estimate past dissolved oxygen concentrations in the near surface waters of the currently well-oxygenated Southern Ocean, which played a critical role in carbon sequestration during glacial times. A down-core planktonic I/Ca record from south of the Antarctic Polar Front (APF) suggests that minimum O2 concentrations in the upper ocean fell below 70 µmol/kg during the last two glacial periods, indicating persistent glacial O2 depletion at the heart of the carbon engine of the Earth's climate system. These new estimates of past ocean oxygenation variability may assist in resolving mechanisms responsible for the much-debated ice-age atmospheric CO2 decline.
    Keywords: Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    (Table S1) I/Ca ratios of surface sediments (2016)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 108-658; 115-709A; 117-720A; 138-849A; 172-1057A; 177-1090A; 202-1242A; 303-U1308C; Arabian Sea; BC; BOFS11896#1; BOFS14K; Box corer; Canarias Sea; Carolina Slope, North Atlantic Ocean; CD159; Charles Darwin; Comment; COMPCORE; Composite Core; D184; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Discovery (1962); DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Elevation of event; Event label; Exp303; Integrated Ocean Drilling Program / International Ocean Discovery Program; Iodine/Calcium ratio; Iodine/Calcium ratio standard deviation; IODP; Joides Resolution; KAL; Kasten corer; Latitude of event; Leg108; Leg115; Leg117; Leg138; Leg172; Leg177; Leg202; Longitude of event; North Atlantic Climate 1; Northeast Atlantic; North Pacific Ocean; Ocean Drilling Program; ODP; RAPiD-06-3B; RAPiD-13-9B; Sample code/label; South Atlantic Ocean; South Indian Ridge, South Indian Ocean; South of Iceland; Species
    Type: Dataset
    Format: text/tab-separated-values, 147 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    Carbonate I/Ca records through Phanerozoic (2018)
    PANGAEA
    In:  Supplement to: Lu, Wanyi; Ridgwell, Andy; Thomas, Ellen; Hardisty, Dalton; Luo, Genming; Algeo, Thomas J; Saltzman, Matthew R; Gill, Benjamin C; Shen, Yanan; Ling, Hong-Fei; Edwards, Cole T; Whalen, Michael T; Zhou, Xiaoli; Gutchess, Kristina M; Jin, Li; Rickaby, Rosalind E M; Jenkyns, Hugh C; Lyons, Timothy W; Lenton, Timothy M; Kump, Lee R; Lu, Zunli (2018): Late inception of a resiliently oxygenated upper ocean. Science, eaar5372, https://doi.org/10.1126/science.aar5372
    Details
    Publication Date: 2024-02-03
    Description: Rising oceanic and atmospheric oxygen levels through time have been crucial to enhanced habitability of surface Earth environments. Few redox proxies can track secular variations in dissolved oxygen concentrations ([O~2~]) around threshold levels for metazoan survival in the upper ocean. We present an extensive compilation of iodine to calcium ratios (I/Ca) in marine carbonates. Our record supports a major rise in atmospheric _p_O~2~ at ~400 million years ago (Ma), and reveals a step-change in the oxygenation of the upper ocean to relatively sustainable near-modern conditions at ~200 Ma. An Earth system model demonstrates that a shift in organic matter remineralization to greater depths, which may have been due to increasing size and biomineralization of eukaryotic plankton, likely drove the I/Ca signals at ~200 Ma.
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    (Table S1) Phanerozoic carbonates sections (2018)
    PANGAEA
    Details
    Publication Date: 2024-02-03
    Keywords: 113-689; 113-690; 143-865; 199-1221; 207-1258; 207-1259; 208-1262; 208-1263; 208-1264; 342-U1407; AGE; Age, maximum/old; Age, minimum/young; Alaska, USA; Alberta_Basin; Area/locality; Aristocrat_Angus_core_1; Arrow_Canyon; Balvany; Belgium; CDRILL; China; Colorado, United States of America; Comment; COMPCORE; Composite Core; Core drilling; Depth, description; Drilling/coring; Eastbourne; Estonia; Event label; Exp342; Fossils; Fuhe; Gardner_Canyon; Guangxi, Guizhou, China; Hungary; Ibex; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Japan; Joides Resolution; Kamura; Kardla; Lawson_Cove; Leg113; Leg143; Leg199; Leg207; Leg208; Lianghekou; Lithology/composition/facies; Longan; Malanbian; Meiklejohn_Peak; Monte_Sorgenza; Monte_Volturino; Morocco, North Africa; Mt_Whelan_1; NE_Brooks_Range; Nevada, United States of America; Nhi_Tao; North Pacific Ocean; Number; Onondaga-Cherry_Valley; OUTCROP; Outcrop sample; Pahranagat_Range; Paleogene Newfoundland Sediment Drifts; Qilinzhai; Queensland, Australia; Raia_del_Pedale; Reference/source; Resolution_Guyot; Section; Selong; Shingle_Pass; Smoke_Hole; South_Ferriby; South Atlantic Ocean; Spruce_Mountain; Tarfaya; Tibet; United Kingdom; Vietnam; Walvis Ridge, Southeast Atlantic Ocean; Wangcun; Xiaotan; Yunnan, China; Yvoir
    Type: Dataset
    Format: text/tab-separated-values, 491 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 8
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    Proxies for paleo-oxygenation: a downcore comparison between benthic foraminiferal surface porosity and I/Ca (2020)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Description: Benthic foraminiferal surface porosity (the mean percentage of surface area covered by pores; higher porosity: lower oxygenation) and iodine to calcium ratio (I/Ca, higher I/Ca: higher oxygenation) are both promising paleoceanographic proxies that will advance through testing in down-core studies. Here we report the first down-core comparison (~45 kyr) of these proxies for a core from the southern Brazilian margin (26°40.22′ S, 46°26.46′ W, 475 m water depth). Both proxies are most sensitive to low-O~2~ conditions (〈 50 µmol/kg), and not well-constrained at higher O~2~ concentrations. Porosity values are generally low (〈 15%) and I/Ca ranges between ~4 and ~6 µmol/mol throughout the core. The two proxies are overall consistent, suggesting that bottom-water oxygen concentrations at the site remained above 50 µmol/kg during the last 45 kyr. Several non-O~2~ factors (e.g., iodate reduction rates, water mass mixing, temperature, foraminiferal shell robustness) could influence the proxies and require further investigation.
    Keywords: AGE; Cibicidoides pseudoungerianus; Cibicidoides pseudoungerianus, Iodine/Calcium ratio; Cibicidoides pseudoungerianus, Iodine/Calcium ratio, standard deviation; Cibicidoides pseudoungerianus, porosity; Cibicidoides pseudoungerianus, porosity, standard deviation; Cibicidoides wuellerstorfi; Cibicidoides wuellerstorfi, porosity; Cibicidoides wuellerstorfi, porosity, standard deviation; DEPTH, sediment/rock; GeoB6201-5; Glacial; Gravity corer (Kiel type); M46/2; Meteor (1986); Methane; Oxygen; SL; southern Brazilian margin
    Type: Dataset
    Format: text/tab-separated-values, 336 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 9
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    (Table S2 ) I/Ca record of phanerozoic carbonates (2018)
    PANGAEA
    Details
    Publication Date: 2024-02-03
    Keywords: 108-658; 113-689; 113-690; 115-709; 117-720; 138-849; 143-865; 172-1057; 177-1090; 199-1221; 202-1242; 207-1258; 207-1259; 208-1262; 208-1263; 208-1264; 303-U1308; 342-U1407; AGE; Alaska, USA; Alberta_Basin; Arabian Sea; Aristocrat_Angus_core_1; Arrow_Canyon; Balvany; BC; Belgium; BOFS11896#1; BOFS14K; Box corer; Canarias Sea; Carolina Slope, North Atlantic Ocean; CD159; CDRILL; Charles Darwin; China; Colorado, United States of America; COMPCORE; Composite Core; Core drilling; D184; Discovery (1962); Drilling/coring; Eastbourne; Epoch; Estonia; Event label; Exp303; Exp342; Fuhe; Gardner_Canyon; Great_Bahamas; Guangxi, Guizhou, China; Hidden_Valley; Hungary; Ibex; Integrated Ocean Drilling Program / International Ocean Discovery Program; Iodine/Calcium ratio; IODP; Japan; Joides Resolution; KAL; Kamura; Kardla; Kasten corer; Latitude of event; Lawson_Cove; Leg108; Leg113; Leg115; Leg117; Leg138; Leg143; Leg172; Leg177; Leg199; Leg202; Leg207; Leg208; Lianghekou; Longan; Longitude of event; Malanbian; Meiklejohn_Peak; Monte_Sorgenza; Monte_Volturino; Morocco, North Africa; Mt_Whelan_1; NE_Brooks_Range; Nevada, United States of America; Nhi_Tao; North Atlantic; North Atlantic Climate 1; Northeast Atlantic; North Pacific Ocean; Onondaga-Cherry_Valley; OUTCROP; Outcrop sample; Pahranagat_Range; Paleogene Newfoundland Sediment Drifts; Qilinzhai; Queensland, Australia; Raia_del_Pedale; RAPiD-06-3B; RAPiD-13-9B; Resolution_Guyot; Sample ID; Section; Selong; Shingle_Pass; Smoke_Hole; South_Ferriby; South Atlantic Ocean; South Indian Ridge, South Indian Ocean; South of Iceland; Spruce_Mountain; Tarfaya; Tibet; United Kingdom; Vietnam; Walvis Ridge, Southeast Atlantic Ocean; Wangcun; Xiaotan; Yunnan, China; Yvoir
    Type: Dataset
    Format: text/tab-separated-values, 6968 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 10
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    Reconstructing the oxygen depth profile in the Arabian Sea during the last glacial period (2023)
    PANGAEA
    Details
    Publication Date: 2024-04-25
    Description: A total of six core sites of western Arabian Sea were selected to form a depth transect with water depths ranging from 600 to 3650 m, in order to reconstruct the oxygen depth profile in the Arabian Sea during the last glacial period. Four RC27 cores were sampled from the Lamont-Doherty Core Repository, and two TN041/047 cores were sampled from the Woods Hole Oceanographic Institution (WHOI) Seafloor Samples Repository. Sampling intervals were every 5 or 10 cm. All cores were dated to last ~30 thousand years. All samples were first freeze-dried, then wet-sieved to 〉 63 µm fraction with de-ionized water, and oven-dried at 45°C. Benthic foraminifera Cibicidoides spp. and Globobulimina affinis were picked from the 〉 212 µm fraction. Photos of benthic foraminifera were taken using a Scanning Electron Microscope (SEM) (Hitachi model TM3000) at WHOI. Benthic surface porosity was determined from the SEM photos. Benthic foraminifera carbon and oxygen isotopic analyses were made using a Finnigan MAT253 mass spectrometer at WHOI.
    Keywords: Arabian Sea; Glacial; Oxygen; Paleoceanography
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
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