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  • PANGAEA  (30)
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  • 11
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    Barium/calcium and strontium/calcium ratios in planktic foraminifer Neogloboquadrina dutertrei from San Pedro Basin (2018)
    PANGAEA
    Details
    Publication Date: 2023-02-12
    Keywords: Collection Site; Identification; LA-ICP-MS, Laser-ablation inductively coupled plasma mass spectrometer; MULT; Multiple investigations; Neogloboquadrina dutertrei, Barium/Calcium ratio; Neogloboquadrina dutertrei, chamber number; Neogloboquadrina dutertrei, Strontium/Calcium ratio; San_Pedro_Basin
    Type: Dataset
    Format: text/tab-separated-values, 332 data points
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  • 12
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    (Table 3) δ¹⁸O, B/Ca and Mg/Ca ratios in Globorotalia inflata from sediment core CHAT_16k
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: AGE; Calculated; Calculated from Mg/Ca ratios (Mashiotta et al. 1999); Carbon dioxide, partial pressure; CHAT_16k; DEPTH, sediment/rock; GC; Globorotalia inflata, Boron/Calcium ratio; Globorotalia inflata, Magnesium/Calcium ratio; Globorotalia inflata, δ18O; Gravity corer; pH; Sea surface temperature, annual mean
    Type: Dataset
    Format: text/tab-separated-values, 242 data points
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  • 13
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    (Table 1, 2) Foraminifera biometric data, and boron isotopic composition of Globigerinoides sacculifer of sediments from the Ontong-Java Plateau (2004)
    PANGAEA
    In:  Supplement to: Hönisch, Bärbel; Hemming, N Gary (2004): Ground-truthing the boron isotope-paleo-pH proxy in planktonic foraminifera shells: Partial dissolution and shell size effects. Paleoceanography, 19(4), PA4010, https://doi.org/10.1029/2004PA001026
    Details
    Publication Date: 2023-07-11
    Description: Sediment samples from the Ontong-Java Plateau in the Pacific and the 90° east ridge in the Indian Ocean were used to investigate whether shell size and early diagenesis affect d11B of the symbiont-bearing planktonic foraminifer Globigerinoides sacculifer. In pristine shells from both study locations we found a systematic increase of d11B and Mg/Ca with shell size. Shells in the sieve size class 515–865 µm revealed d11B values +2.1 to +2.3 per mil higher than shells in the 250–380 µm class. This pattern is most likely due to differences in symbiont photosynthetic activity and its integrated effect on the pH of the foraminiferal microenvironment. We therefore suggest smaller individuals must live at approximately 50–100 m water depth where ambient light levels are lower. Using the empirical calibration curve for d11B in G. sacculifer, only shells larger than 425 µm reflect surface seawater pH. Partial dissolution of shells derived from deeper sediment cores was determined by shell weight analyses and investigation of the shell surface microstructure by scanning electron microscopy. The d11B in partially dissolved shells is up to 2 per mil lower relative to pristine shells of the same size class. In agreement with a relatively higher weight loss in smaller shells, samples from the Ontong-Java Plateau show a more pronounced dissolution effect than larger shells. On the basis of the primary size effect and potential postdepositional dissolution effects, we recommend the use of shells that are visually pristine and, in the case of G. sacculifer, larger than 500 μm for paleoreconstructions.
    Keywords: Calculated from d11B; Calculated from Mg/Ca ratios (Dekens et al. 2002); Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Elevation of event; Event label; GC; Gravity corer; Latitude of event; Longitude of event; Magnesium/Calcium ratio; Mass; PC; pH; Piston corer; RC10; RC10-139; RC14; RC14-35; RC14-36; RC14-37; RC17; RC17-176TW; Robert Conrad; Sea surface temperature, annual mean; Size fraction; V32; V32-173; V34; V34-54; V34-58; Vema; δ11B
    Type: Dataset
    Format: text/tab-separated-values, 169 data points
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  • 14
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    (Table 1) B/Ca ratios in planktonic foraminifera from core top sediments (2007)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 177-1088; BC; Boron/Calcium ratio; Boron hydroxide/Bicarbonate ratio; Box corer; Calculated from Mg/Ca ratios (Elderfield & Ganssen, 2000); Calculated from stable oxygen isotopes; Carbonate ion; Charles Darwin; CHAT_16k; COMPCORE; Composite Core; DEPTH, sediment/rock; Distribution coefficient; Elevation of event; Estimated; Event label; GC; Globorotalia inflata, Boron/Calcium ratio; Gravity corer; Gravity corer (Kiel type); Joides Resolution; Latitude of event; Leg177; Longitude of event; NEAP; NEAP-02B; NEAP-03B; NEAP-04B; NEAP-05B; NEAP-07B; NEAP-08B; NEAP-10B; NEAP-11B; NEAP-13B; NEAP-15B; NEAP-17B; NEAP-18B; NEAP-19B; NEAP-20B; North Atlantic; Ocean Drilling Program; ODP; SL; South Atlantic Ocean; T86-01B; T86-03B; T86-05B; T86-08B; T86-09B; T86-10S; T88-02B; T88-03B; T88-05B; T88-06B; T88-07B; T88-09B; T88-11B; T88-12B; T88-13B; T88-14B; T88-15aB; T88-15B; T90-01B; T90-02B; T90-03B; T90-04B; T90-05B; T90-08B; T90-11B; T90-12B; T90-15B; Temperature, water, interpolated
    Type: Dataset
    Format: text/tab-separated-values, 322 data points
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  • 15
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    (Table 2) B/Ca and Mg/Ca ratios in planktonic foraminifera from ODP Hole 108-668B (2007)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 108-668B; AGE; Boron hydroxide/Bicarbonate ratio; Calculated; Calculated from Mg/Ca ratios (Anand et al., 2003); Carbonate ion; Carbon dioxide, partial pressure; Distribution coefficient; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Globigerinoides ruber white, Boron/Calcium ratio; Globigerinoides ruber white, Magnesium/Calcium ratio; Joides Resolution; Leg108; Ocean Drilling Program; ODP; pH; Sample code/label; Sea surface temperature, annual mean; South Atlantic Ocean
    Type: Dataset
    Format: text/tab-separated-values, 288 data points
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  • 16
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    B-isotope and Mg/Ca ratios of planktonic foraminifera from ODP Hole 108-668B and esimates of salinity, alkalinity and pCO2 (Table 1) (2005)
    PANGAEA
    In:  Supplement to: Hönisch, Bärbel; Hemming, N Gary (2005): Surface ocean pH response to variations in pCO2 through two full glacial cycles. Earth and Planetary Science Letters, 236(1-2), 305-314, https://doi.org/10.1016/j.epsl.2005.04.027
    Details
    Publication Date: 2024-01-09
    Description: Knowledge of past atmospheric pCO2 is important for evaluating the role of greenhouse gases in climate forcing. Ice core records show the tight correlation between climate change and pCO2, but records are limited to the past ~900 kyr. We present surface ocean pH and pCO2 data, reconstructed from boron isotopes in planktonic foraminifera over two full glacial cycles (0-140 and 300-420 kyr). The data co-vary strongly with the Vostok pCO2-record and demonstrate that the coupling between surface ocean chemistry and the atmosphere is recorded in marine archives, allowing for quantitative estimation of atmospheric pCO2 beyond the reach of ice cores.
    Keywords: 108-668B; AGE; Alkalinity, total; Calculated; Calculated from Mg/Ca ratios (Dekens et al. 2002); Carbon dioxide, partial pressure; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Globigerinoides ruber, Magnesium/Calcium ratio; Inductively coupled plasma - mass spectrometry (ICP-MS); Joides Resolution; Leg108; Magnesium/Calcium ratio, standard deviation; Mass; Number; Ocean Drilling Program; ODP; pH; Salinity; Sample code/label; Sea level variation; Sea surface temperature, annual mean; South Atlantic Ocean; Thermal Ionization Mass Spectrometry (TIMS); δ11B; δ11B, standard deviation; δ18O, water
    Type: Dataset
    Format: text/tab-separated-values, 308 data points
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  • 17
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    B/Ca ratios in planktonic foraminifera (2007)
    PANGAEA
    In:  Supplement to: Yu, Jimin; Elderfield, Henry; Hönisch, Bärbel (2007): B/Ca in planktonic foraminifera as a proxy for surface seawater pH. Paleoceanography, 22(2), PA2202, https://doi.org/10.1029/2006PA001347
    Details
    Publication Date: 2024-01-09
    Description: Boron isotope systematics indicate that boron incorporation into foraminiferal CaCO3 is determined by the partition coefficient, KD = [B/Ca](CaCO3)/[B(OH)4**-/HCO3**-](seawater), and [B(OH)4-/HCO3-](seawater), providing, in principle, a method to estimate seawater pH and PCO2. We have measured B/Ca ratios in Globigerina bulloides and Globorotaliainflata for a series of core tops from the North Atlantic and the Southern Ocean and in Globigerinoides ruber (white) from Ocean Drilling Program (ODP) site 668B on the Sierra Leone Rise in the eastern equatorial Atlantic. B/Ca ratios in these species of planktonic foraminifera seem unaffected by dissolution on the seafloor. KD shows a strong species-specific dependence on calcification temperature, which can be corrected for using the Mg/Ca temperature proxy. A preliminary study of G. inflata from Southern Ocean sediment core CHAT 16K suggests that temperature-corrected B/Ca was ~30% higher during the last glacial. Correspondingly, pH was 0.15 units higher and aqueous PCO2 was 95 matm lower at this site at the Last Glacial Maximum. The covariation between reconstructed PCO2 and the atmospheric pCO2 from the Vostok ice core demonstrates the feasibility of using B/Ca in planktonic foraminifera for reconstructing past variations in pH and PCO2.
    Keywords: Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 18
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    Stable carbon and oxygen isotope ratios of Cibicidoides wuellerstorfi (Table 1) (2008)
    PANGAEA
    In:  Supplement to: Hönisch, Bärbel; Bickert, Torsten; Hemming, N Gary (2008): Modern and Pleistocene boron isotope composition of the benthic foraminifer Cibicidoides wuellerstorfi. Earth and Planetary Science Letters, 272(1-2), 309-318, https://doi.org/10.1016/j.epsl.2008.04.047
    Details
    Publication Date: 2024-02-02
    Description: Here we present the first species-specific study of boron isotopes in the epibenthic foraminifer species Cibicidoides wuellerstorfi. Coretop samples from a water depth profile from 1000 to 4500 m on the northern flank of the Walvis Ridge are 4.4 per mil lower than the values expected, based on calculations of the delta 11B(borate) of ambient seawater. Similar values for this foraminifer species are presented from ODP site 668B at the Sierra Leone Rise, in the equatorial Atlantic. The consistency between data of the same species suggests the offsets are primary, rather than diagenetic. Glacial C. wuellerstorfi from ODP 668B and Walvis Ridge have boron isotope compositions only slightly different to interglacial samples, that is no larger than +0.10 pH units, or +23 µmol/kg in [CO3[2-]] above the reconstructed glacial lysocline, and -0.07 pH units, or -14 µmol/kg in [CO3[2-]] below. We use these results to suggest that glacial deep water pH in the Atlantic was similar to interglacial pH. The new data resolve the inconsistency between the previously reported high bottom water pH and the lack of significant carbonate preservation of the glacial deep ocean.
    Keywords: AGE; Angola Basin; Cape Basin; Cibicidoides wuellerstorfi, δ13C; Cibicidoides wuellerstorfi, δ18O; DEPTH, sediment/rock; Elevation of event; Event label; GeoB1032-2; GeoB1032-3; GeoB1034-1; GeoB1034-3; GeoB1035-2; GeoB1035-4; GeoB1211-1; GeoB1211-3; GeoB1214-1; GeoB1214-2; GeoB1220-1; GeoB1220-2; GeoB1710-2; Giant box corer; GKG; Gravity corer (Kiel type); Isotope ratio mass spectrometry; Latitude of event; Longitude of event; M12/1; M20/2; M6/6; Meteor (1986); MUC; MultiCorer; Namibia Continental Margin; SL; Walvis Ridge
    Type: Dataset
    Format: text/tab-separated-values, 26 data points
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  • 19
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    B- and O-isotope and Mg/Ca ratios of planktonic foraminifera and estimates of salinity, alkalinity and pCO2 for ODP Hole 108-668B (Table 1) (2009)
    PANGAEA
    In:  Supplement to: Hönisch, Bärbel; Hemming, N Gary; Archer, David E; Siddall, Mark; McManus, Jerry F (2009): Atmospheric Carbon Dioxide Concentration Across the Mid-Pleistocene Transition. Science, 324(5934), 1551-1554, https://doi.org/10.1126/science.1171477
    Details
    Publication Date: 2024-04-16
    Description: The dominant period of Pleistocene glacial cycles changed during the mid-Pleistocene from 40,000 years to 100,000 years, for as yet unknown reasons. Here we present a 2.1-million-year record of sea surface partial pressure of CO2 (PCO2), based on boron isotopes in planktic foraminifer shells, which suggests that the atmospheric partial pressure of CO2 (pCO2) was relatively stable before the mid-Pleistocene climate transition. Glacial PCO2 was ~31 microatmospheres higher before the transition (more than 1 million years ago), but interglacial PCO2 was similar to that of late Pleistocene interglacial cycles (〈450,000 years ago). These estimates are consistent with a close linkage between atmospheric CO2 concentration and global climate, but the lack of a gradual decrease in interglacial PCO2 does not support the suggestion that a long-term drawdown of atmospheric CO2 was the main cause of the climate transition.
    Keywords: 108-668B; AGE; Alkalinity, total; Calculated; Calculated from Mg/Ca ratios; Comment; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Error, absolute; Globigerinoides ruber white, Magnesium/Calcium ratio; Globigerinoides ruber white, δ18O; Inductively coupled plasma atomic emission spectroscope (ICP-AES); Joides Resolution; Leg108; Ocean Drilling Program; ODP; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; Salinity; Sample code/label; Sea surface temperature, annual mean; South Atlantic Ocean; δ11B
    Type: Dataset
    Format: text/tab-separated-values, 978 data points
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  • 20
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    Stable isotope ratios, and trace elements from Pacific and S. Atlantic mid-latitudes across Eocene Thermal Maximum 2 and the Paleocene-Eocene Thermal Maximum (2019)
    PANGAEA
    In:  Supplement to: Harper, Dustin T; Hönisch, Bärbel; Zeebe, Richard E; Shaffer, Gary; Haynes, Laura; Thomas, E; Zachos, James C (2020): The Magnitude of Surface Ocean Acidification and Carbon Release During Eocene Thermal Maximum 2 (ETM‐2) and the Paleocene‐Eocene Thermal Maximum (PETM). Paleoceanography and Paleoclimatology, 35(2), e2019PA003699, https://doi.org/10.1029/2019PA003699
    Details
    Publication Date: 2024-04-13
    Description: Eocene Thermal Maximum 2 (ETM‐2; 54.1 Ma) was the second largest Eocene hyperthermal. Like the Paleocene‐Eocene Thermal Maximum (PETM), ETM‐2 was characterized by massive carbon emissions and several degrees of global warming and thus can serve as a case study for assessing the impacts of rapid CO2 emissions on ocean carbonate chemistry, biota, and climate. Marine carbonate records of ETM‐2 are better preserved than those of the PETM due to more subdued carbonate dissolution. As yet, however, the magnitude of this carbon cycle perturbation has not been well constrained. Here, we present the first records of surface ocean acidification for ETM‐2, based on stable boron isotope records in mixed‐layer planktic foraminifera from two midlatitude ODP sites (1210 in the North Pacific and 1265 in the SE Atlantic), which indicate conservative minimum global sea surface acidification of −0.20 +0.12/−0.13 pH units. Using these estimates of pH and temperature as constraints on carbon cycle model simulations, we conclude that the total mass of C, released over a period of 15 to 25 kyr during ETM‐2, likely ranged from 2,600 to 3,800 Gt C, which is greater than previously estimated on the basis of other observations (i.e., stable carbon isotopes and carbonate compensation depth) alone.
    Keywords: Boron isotope; carbon isotope; ETM-2; Ocean Drilling Program; ODP; PETM
    Type: Dataset
    Format: application/zip, 4 datasets
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