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  • PANGAEA  (12)
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  • 1
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    Ice density-based surface mass balance from the ABN1314-103 ice core, Aurora Basin North, Antarctica (2022)
    PANGAEA
    Details
    Publication Date: 2023-01-30
    Keywords: ABN1314-103 ice core; Age; AGE; Age-depth model (ALC01112018); Ant_ABN-1314; Antarctica; Calculated from density and age-depth model; Chemical and physical analysis in snow/firn for accumulation studies in Adelie L; CHICTABA; density; Density, ice; Depth, bottom/max; DEPTH, ice/snow; Depth, top/min; East Antarctica; IC; Ice core; Ice corer; nitrate; nitrogen isotope ratio (δ15N); Physical measurement; Sample ID; surface mass balance; Surface mass balance; Time in years
    Type: Dataset
    Format: text/tab-separated-values, 774 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Nitrate δ15N values and ice density-based surface mass balance from the ABN1314-103 ice core, Aurora Basin North, Antarctica (2022)
    PANGAEA
    Details
    Publication Date: 2023-01-30
    Description: Nitrate concentration and isotopic (δ15NNO3) data, ice density, and surface mass balance estimates from the ABN1314-103 ice core. This 103 m long core was drilled beginning on 07 January 2014 as one of three ice cores at Aurora Basin North, Antarctica (-71.17, 111.37, 2679 m.a.s.l), in the 2013-2014 field season. The age-depth model for ABN1314-103 was matched through ion profiles from an annually-resolved model (ALC01112018) originally developed for one of the other ABN cores through seasonal ion and water isotope cycles and constrained by volcanic horizons. Each 1 m segment of the core was weighed and measured for ice density calculations, and then sampled for nitrate at 0.33 m resolution. Nitrate concentrations were taken on melted ice aliquots with ion chromatography, while isotopic analysis was achieved through bacterial denitrification and MAT 253 mass spectrometry after concentrating with anionic resin. Using the density data and the age-depth model's dates for the top and bottom of each 1 m core segment, we reconstructed a history of surface mass balance changes as recorded in ABN1314-103. Additionally, we also estimated the effect of upstream topographic changes on the ice core's surface mass balance record through a ground penetrating radar transect that extended 11.5 km against the direction of glacial ice flow. The modern SMB changes along this upstream transect were linked to ABN1314-103 core depths by through the local horizontal ice flow rate (16.2 m a-1) and the core's age-depth model, and included here for comparative analysis. See Akers et al., 2022 for more analytical details.
    Keywords: Antarctica; density; Ice core; nitrate; nitrogen isotope ratio (δ15N); surface mass balance
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Nitrate concentration, isotopic δ15N and surface mass balance from the ABN1314-103 ice core, Aurora Basin North, Antarctica (2022)
    PANGAEA
    Details
    Publication Date: 2023-02-13
    Keywords: ABN1314-103 ice core; Age; AGE; Age-depth model (ALC01112018); Ant_ABN-1314; Antarctica; Chemical and physical analysis in snow/firn for accumulation studies in Adelie L; CHICTABA; Colorimetry and/or ion chromatography; density; Depth, bottom/max; DEPTH, ice/snow; Depth, top/min; East Antarctica; Ground-penetrating radar (GPR); IC; Ice core; Ice corer; Mass spectrometer, Finnigan, MAT 253; nitrate; Nitrate; nitrogen isotope ratio (δ15N); Physical measurement; Sample ID; surface mass balance; Surface mass balance; Time in years; δ15N; δ15N, standard error
    Type: Dataset
    Format: text/tab-separated-values, 3207 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Nitrate chemistry of snow samples collected along the CHICTABA transect, East Antarctica, 2013-2014 (2022)
    PANGAEA
    Details
    Publication Date: 2023-06-06
    Description: Nitrate samples were originally collected as 0.2-1.5 kg snow samples in the field along the CHICTABA traverse, Antarctica. Snow was collected in three methods: snow pits, skin layer, and 1 m depth layer. For snow pits, snow was collected in increments of 3 cm thick layers. Skin layer samples were collected as the loose snow grains 2-6 mm deep on the surface. The 1 m depth layer samples were taken as a 5-10 cm thick layer surrounding 1 m depth, which was then thoroughly mixed. Samples were melted and nitrate concentrated with a ion exchange resin at Concordia Station, Antarctica. Isotopic analysis performed with MAT253 mass spectrometer at IGE, Grenoble, France.
    Keywords: Ant_ABN-01; Ant_ABN-02; Ant_ABN-03; Ant_CHIC-01; Ant_CHIC-02; Ant_CHIC-03; Ant_CHIC-04; Ant_CHIC-05; Ant_CHIC-06; Ant_CHIC-07; Ant_CHIC-08; Ant_CHIC-09; Ant_CHIC-10; Ant_CHIC-11; Ant_CHIC-12; Ant_CHIC-13; Ant_CHIC-14; Ant_CHIC-15; Ant_CHIC-16; Ant_CHIC-17; Ant_CHIC-18; Ant_CHIC-19; Ant_CHIC-20; Ant_CHIC-21; Ant_CHIC-22; Antarctica; Calculated; Chemical and physical analysis in snow/firn for accumulation studies in Adelie L; CHICTABA; Colorimetry; Confidence interval; Density, snow; Depth, bottom/max; DEPTH, ice/snow; Depth, top/min; East Antarctica; Event label; Group; isotopes; MAR output; Mass spectrometer MAT253; Model error; nitrate; Nitrate; Nitrate, standard error; Sample comment; Sample ID; Site; snow; SNOW; Snow/ice sample; Surface mass balance; transect; Δ17O, anomaly, fractional abundance; Δ17O, standard error; δ15N, nitrate, fractional abundance; δ15N, standard error; δ17O, nitrate, fractional abundance; δ17O, standard error; δ18O, nitrate, fractional abundance; δ18O, standard error
    Type: Dataset
    Format: text/tab-separated-values, 6163 data points
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    DATA PANGAEA
  • 5
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    Reference Elevation Model of Antarctica elevations along the CHICTABA transect, East Antarctica (2022)
    PANGAEA
    Details
    Publication Date: 2023-06-06
    Keywords: Antarctica; Distance; ELEVATION; Extracted from REMA; isotopes; nitrate; snow; transect
    Type: Dataset
    Format: text/tab-separated-values, 7404 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    (Table S1) 230Th normalized diatom fluxes through HE1 in sediment core MD95-2027
    PANGAEA
    In:  Supplement to: Nave, Silvia Osorio; Labeyrie, Laurent D; Gherardi, Jeanne-Marie; Caillon, Nicolas; Cortijo, Elsa; Kissel, Catherine; Abrantes, Fatima F (2007): Primary productivity response to Heinrich events in the North Atlantic Ocean and Norwegian Sea. Paleoceanography, 22(3), PA3216, https://doi.org/10.1029/2006PA001335
    Details
    Publication Date: 2023-06-27
    Description: he last glacial was punctuated by several massive ice sheet surges into the North Atlantic that impacted surface water hydrology especially where icebergs melted. However, the links between variations in surface water hydrology and surface water productivity during these Heinrich events (HEs) remain uncertain. To address this issue, diatoms and organic carbon were examined across Heinrich event 1 (HE 1) and Heinrich event 4 (HE 4) in seven sediment cores spanning 40°N to 63°N latitude. Our results show low diatom abundances during HEs, consistent with decreased surface water productivity. Diatom dilution by increased sediment flux was tested by normalizing diatom abundance to a constant 230Th flux. Although the particle rain rate was enhanced during HEs, this does not explain the sharp drop in diatoms. During HE 4, surface productivity decreased at all latitudes examined, probably because of strong, year-round stratification. The same inferred changes occurred during HE 1 within the area of maximum iceberg melting. However, at northern latitudes (above 50°N) the summer insolation increase of the glacial termination drove increased surface productivity during the whole period, including HE 1. Marine organic carbon, taken as independent proxy for export production, supports the diatom data. Trends shown by the productivity proxies evolve generally in parallel with the hydrographic proxies, with an increase in productivity when sea surface temperature increases.
    Keywords: -; Accumulation rate, diatoms; AGE; CALYPSO; Calypso Corer; DEPTH, sediment/rock; Diatoms, total, per unit sediment mass; IMAGES I; Marion Dufresne (1995); MD101; MD952027; MD95-2027; Newfoundland Slope; Thorium-230, flux normalized
    Type: Dataset
    Format: text/tab-separated-values, 150 data points
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    DATA PANGAEA
  • 7
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    Nitrate isotopic data from snow collected along the CHICTABA traverse, East Antarctica, 2013-2014 (2022)
    PANGAEA
    Details
    Publication Date: 2023-06-06
    Description: This dataset contains isotopic ratios of nitrate analyzed from snow samples collected along the CHICTABA traverse in East Antarctica in Nov 2013-Jan 2014. Supplemental information on the elevation (doi:10.5194/tc-13-665-2019) and surface mass balance changes (doi:10.5194/tc-13-281-2019) along the traverse route are also included for context. The samples came from relatively shallow depths of the snowpack (maximum = 2.03 m deep) and represent nitrate deposition that occurred from 0-6 years ago. These samples were collected in order to better understand the interaction and mass transfer of nitrate at the snow-air interface in Antarctica, with particular focus on determining the impacts of photolysis on nitrate. Snow samples were collected with three techniques: skin layer samples of the loose snow grains 2-6 mm deep on the snow surface, 1 m depth layer samples taken as a 5-10 cm thick layer from 1 m below the snow surface, and snow pits that extended 99-203 cm deep and were sampled at 3 cm continuous intervals. 250-1500 g of snow were collected into clean plastic bags, melted at room temperature at Concordia Station, Dome C, and then the nitrate was concentrated using an ionic exchange resin. Nitrate concentrations were determined using colorimetry. Isotopic analysis occurred at the Institut des Géosciences de l'Environnement, Grenoble, France, through bacterial denitrification and a MAT 253 mass spectrometer with Gas Bench.
    Keywords: Antarctica; isotopes; nitrate; snow; transect
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 8
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    Sea Surface Temperature (SST) Mg/Ca record for the surface-dwelling planktonic foraminifera Globigerina bulloides (2013)
    PANGAEA
    In:  Supplement to: Boussetta, Soumaya; Kallel, Nejib; Bassinot, Franck C; Labeyrie, Laurent D; Duplessy, Jean-Claude; Caillon, Nicolas; Dewilde, Fabien; Rebaubier, Hélène (2012): Mg/Ca-paleothermometry in the western Mediterranean Sea on planktonic foraminifer species Globigerina bulloides: Constraints and implications. Comptes Rendus Geoscience, 344(5), 267-276, https://doi.org/10.1016/j.crte.2012.02.001
    Details
    Publication Date: 2023-06-27
    Description: We generated a high-resolution SSTMg/Ca record for the surface-dwelling planktonic foraminifera Globigerina bulloides from the core MD99-2346 collected in the Gulf of Lion, and compared it to that obtained using modern analogue techniques applied to fossil foraminiferal assemblages (SSTMAT). The two temperature records display similar patterns during the last 28,000 years but the SSTMg/Ca estimates are several degrees warmer (~+4 °C) than SSTMAT. The temperature shift between SSTMg/Ca and SSTMAT remained relatively constant over time. This seems to exclude a bias on the Mg/Ca record associated with salinity or secondary Mg-rich calcite encrustation on the foraminiferal tests during early diagenesis. Therefore, anomalously high Mg/Ca suggests either: (1) the empirical equation for G. bulloides of Elderfield and Ganssen (2000) is incorrect; or (2) there is a specific Mediterranean genotypes of G. bulloides for which a specific Mg/Ca-temperature calibration is needed.
    Keywords: 101; 99; Calculated (Shackleton, 1974); Calculated from Mg/Ca ratios (Elderfield & Ganssen, 2000); CALYPSO; Calypso Corer; DED87-07; DEDALE87; DEPTH, sediment/rock; ETNA80; Event label; from Levitus & Boyer 1994; Globigerina bulloides, Magnesium/Calcium ratio; Globigerina bulloides, δ18O; IMAGES V; Isotope ratio mass spectrometry; KET80-03; KET80-19; KET80-22; Marion Dufresne (1972); Marion Dufresne (1995); MD114; MD90-901; MD99-2344; MD99-2346; Mediterranean Sea; Mediterranean Sea Acidification in a Changing Climate; MedSeA; Neofan; PC; Piston corer; PROMETEI; ride Calmar; Sea surface temperature; Temperature, calculated
    Type: Dataset
    Format: text/tab-separated-values, 42 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 9
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    Mg/Ca and Sr/Ca ratios of planktonic foraminifera from North Atlantic surface sediments (2008)
    PANGAEA
    In:  Supplement to: Cléroux, Caroline; Cortijo, Elsa; Anand, Pallavi; Labeyrie, Laurent D; Bassinot, Franck C; Caillon, Nicolas; Duplessy, Jean-Claude (2008): Mg/Ca and Sr/Ca ratios in planktonic foraminifera: Proxies for upper water column temperature reconstruction. Paleoceanography, 23(3), PA3214, https://doi.org/10.1029/2007PA001505
    Details
    Publication Date: 2023-07-11
    Description: Reliable temperature estimates from both surface and subsurface ocean waters are needed to reconstruct past upper water column temperature gradients and past oceanic heat content. This work examines the relationships between trace element ratios in fossil shells and seawater temperature for surface-dwelling foraminifera species, Globigerinoides ruber (white) and Globigerina bulloides, and deep-dwelling species, Globorotalia inflata, Globorotalia truncatulinoides (dextral and sinistral) and Pulleniatina obliquiloculata. Mg/Ca and Sr/Ca ratios in shells picked in 29 modern core tops from the North Atlantic Ocean are calibrated using calculated isotopic temperatures. Mg/Ca ratios on G. ruber and G. bulloides agree with published data and relationships. For deep-dwelling species, Mg/Ca calibration follows the equation Mg/Ca = 0.78 (±0.04) * exp (0.051 (±0.003) * T) with a significant correlation coefficient of R**2 = 0.74. Moreover, there is no significant difference between the different deep-dwellers analyzed. For the Sr/Ca ratio, the surface dwellers and P. obliquiloculata do not record any temperature dependence. For the Globorotalia species, the thermo dependence of Sr/Ca ratio can be described by a single linear relationship: Sr/Ca = (0.0182 (±0.001) * T) + 1.097 (±0.018), R**2 = 0.85. Temperature estimates with a 1 sigma error of ±2.0°C and ±1.3°C can be derived from the Mg/Ca and Sr/Ca ratios, respectively, as long as the Sr geochemistry in the ocean has been constant through time.
    Keywords: 408US; Atlantic; Barra fan; BC; Blake Plateau, Atlantic Ocean; Box corer; Calculated from stable oxygen isotopes; CALYPSO; Calypso Corer; Cape Hateras; CH69-K09; CHO288-54; DEPTH, sediment/rock; Elevation of event; Event label; F1KR02; F1KR10; F1KR11; F1KR12; F1KS39; F2KR01; FAEGAS; GC; Gibbs fracture; Globigerina bulloides, Magnesium/Calcium ratio; Globigerina bulloides, Strontium/Calcium ratio; Globigerina bulloides, δ18O; Globigerinoides ruber, Magnesium/Calcium ratio; Globigerinoides ruber, δ18O; Globigerinoides ruber white, Strontium/Calcium ratio; Globorotalia inflata, Magnesium/Calcium ratio; Globorotalia inflata, Strontium/Calcium ratio; Globorotalia inflata, δ18O; Globorotalia truncatulinoides dextral, Magnesium/Calcium ratio; Globorotalia truncatulinoides dextral, Strontium/Calcium ratio; Globorotalia truncatulinoides dextral, δ18O; Globorotalia truncatulinoides sinistral, Magnesium/Calcium ratio; Globorotalia truncatulinoides sinistral, Strontium/Calcium ratio; Globorotalia truncatulinoides sinistral, δ18O; Grab; GRAB; Gravity corer; gridded; Iceland; IMAGES I; IMAGES V; IMAGES XI - P.I.C.A.S.S.O.; INMD; INMD-042BX; INMD-048BX; INMD-052P; INMD-068BX; Latitude of event; Le Suroît; Longitude of event; Marion Dufresne (1995); MD032649G; MD03-2649G; MD101; MD114; MD132; MD952002; MD95-2002; MD952005; MD95-2005; MD952014; MD95-2014; MD952017; MD95-2017; MD952019; MD95-2019; MD952021; MD95-2021; MD952023; MD95-2023; MD952039; MD95-2039; MD952041; MD95-2041; MD99-2203; Melville; Meriadzec; Namoc; Newfoundland margin; North Atlantic; PALEOCINAT; PC; Piston corer; Porto Seamount; Pulleniatina obliquiloculata, Magnesium/Calcium ratio; Pulleniatina obliquiloculata, Strontium/Calcium ratio; Pulleniatina obliquiloculata, δ18O; Sea surface temperature, annual mean; Size fraction; SU90-02; SU90-03; SU90-06; SU90-08; SU90-37; δ18O, water
    Type: Dataset
    Format: text/tab-separated-values, 755 data points
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  • 10
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    Spatial variability in sub-photic zone nitrate δ15N and surface mass balance across East Antarctica (2022)
    PANGAEA
    Details
    Publication Date: 2023-07-19
    Description: Geographic information, surface mass balance (SMB) data, and sub-photic zone (〉0.3 m) nitrate concentration and nitrogen isotopic composition (δ15NNO3) for 135 sites across East Antarctica. This database was used to examine and define the relationship between δ15NNO3 and SMB in Antarctica as part of the SCADI (Snow Core Accumulation from Delta-15N Isotopes) and EAIIST (East Antarctic International Ice Sheet Traverse) projects. Of these 135 sites, 92 are newly reported here while the other site data were previously published and are cited accordingly. Snow bearing nitrate was sampled from snow pits and firn/ice cores at different dates depending on the original scientific campaign, but predominately between 2010 and 2020, with the earliest sampling occurring in 2004. Nitrate was later extracted from the snow, concentrated, and analyzed for δ15NNO3. Surface mass balance data comes from a combination of previous ground-based observations (e.g., stakes, ice core data) and the output from Modèle Atmosphérique Régional version 3.6.4 with European Centre for Medium-Range Weather Forecasts “Interim” re-analysis data (ERA-interim) data, adjusted for observed model SMB biases. Elevation data were extracted from the Reference Elevation Model of Antarctica (REMA, https://doi.org/10.5194/tc-13-665-2019).
    Keywords: ABN1314-103 ice core; Ant_ABN-1314; Ant_ABN-DL1; Ant_ABN-DL2; Ant_ABN-P4; Ant_ABN-P5; Ant_AGO5; Ant_asuma.2016.1; Ant_asuma.2016.2; Ant_CHIC-01; Ant_CHIC-04; Ant_CHIC-05; Ant_CHIC-07; Ant_CHIC-10; Ant_CHIC-11; Ant_CHIC-13; Ant_CHIC-15; Ant_CHIC-18; Ant_CHIC-20; Ant_cph.d17; Ant_cph.d24; Ant_cph.d5; Ant_cph1516; Ant_DA2005; Ant_DC04; Ant_DC07-1; Ant_DC07-2; Ant_DC07-3; Ant_dc14; Ant_dc2010pits; Ant_DF1; Ant_DF2; Ant_dml.pit.a; Ant_dml.pit.b; Ant_eaiist.stop01; Ant_eaiist.stop02; Ant_eaiist.stop03; Ant_eaiist.stop04; Ant_eaiist.stop05; Ant_eaiist.stop06; Ant_eaiist.stop07; Ant_eaiist.stop08a; Ant_eaiist.stop08b; Ant_eaiist.stop09; Ant_eaiist.stop10; Ant_eaiist.stop11; Ant_eaiist.stop12; Ant_eaiist.stop13a; Ant_eaiist.stop13b; Ant_eaiist.stop14; Ant_eaiist.stop19; Ant_eaiist.stop20; Ant_eaiist.stop21; Ant_eaiist.stop22; Ant_eaiist.stop23; Ant_eaiist.stop24; Ant_eaiist.stop25; Ant_eaiist.stop26; Ant_Fuji_Pass; Ant_H108; Ant_H128; Ant_H42; Ant_H68; Ant_H88; Ant_IM0; Ant_IV; Ant_MD590; Ant_NDF; Ant_NMD304; Ant_Paleo; Ant_Plateau_S; Ant_posteaiist.asuma01; Ant_posteaiist.asuma02; Ant_posteaiist.asuma03; Ant_posteaiist.asuma04; Ant_posteaiist.asuma05; Ant_posteaiist.asuma06; Ant_posteaiist.asuma07; Ant_posteaiist.asuma08; Ant_posteaiist.asuma09; Ant_posteaiist.asuma10; Ant_posteaiist.asuma11; Ant_posteaiist.samba; Ant_posteaiist.stop27; Ant_posteaiist.stop28; Ant_posteaiist.stop29; Ant_posteaiist.stop30; Ant_posteaiist.stop31; Ant_posteaiist.stop32; Ant_posteaiist.stop33; Ant_posteaiist.stop34; Ant_posteaiist.stop35; Ant_posteaiist.stop36; Ant_posteaiist.stop37; Ant_posteaiist.stop38; Ant_preeaiist.01; Ant_preeaiist.02; Ant_preeaiist.03; Ant_preeaiist.04; Ant_preeaiist.05; Ant_preeaiist.06; Ant_preeaiist.07; Ant_preeaiist.08; Ant_preeaiist.09; Ant_preeaiist.10; Ant_preeaiist.11; Ant_preeaiist.12; Ant_preeaiist.13; Ant_preeaiist.14; Ant_preeaiist.15; Ant_preeaiist.16; Ant_preeaiist.17; Ant_preeaiist.18; Ant_S1; Ant_S2; Ant_S3; Ant_S30-JARE; Ant_S4; Ant_S80core; Ant_S80pit; Ant_V09-1; Ant_V09-2; Ant_VI; Ant_VIII; Ant_X; Ant_XII; Ant_XIV; Ant_XVI; Ant_XVIII; Ant_Z2; Ant_ZtoA-P1; Ant_ZtoA-P2; Ant_ZtoA-P3; Ant_ZtoA-P4; Ant_ZtoA-P5; Ant_ZtoA-P7; Antarctica; Bias-adjusted MAR output; Campaign; Category; Chemical and physical analysis in snow/firn for accumulation studies in Adelie L; CHICTABA; Colorimetry and/or ion chromatography; Comment; East Antarctica; ELEVATION; Event label; Extracted from REMA; GPS in field; IC; Ice core; Ice corer; isotope; LATITUDE; LONGITUDE; MAR output; Mass spectrometer, Finnigan, MAT 253; nitrate; Nitrate; nitrogen isotope ratio (δ15N); Physical measurement and observations; Reference/source; Site; SNOW; Snow/ice sample; Snow pits/firn core/ice core; surface mass balance; Surface mass balance; Transect; Type; δ15N
    Type: Dataset
    Format: text/tab-separated-values, 1904 data points
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