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Pinho, Tainã Marcos Lima; Nürnberg, Dirk; Meckler, Anna Nele; Mollenhauer, Gesine; Müller, Juliane; Lohmann, Gerrit; Lembke-Jene, Lester; Hidayat, Salma; Rigalleau, Vincent; Lamy, Frank; Tiedemann, Ralf (2026): Mg/Ca-based subsurface temperature and ice volume-corrected δ18O of seawater based on Neogloboquadrina pachyderma sinistral from the eastern Weddell Sea off Dronning Maud Land over the last 75 ka [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.992006 (DOI registration in progress)

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Published: 2026-02-19

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Abstract:
Mg/Ca-based subsurface temperature (°C) and ice volume-corrected δ18O of seawater (δ18Osw-ivc; ‰ VSMOW) based on Neogloboquadrina pachyderma sinistral from eastern Weddell Sea sediment core PS128_2. The foraminiferal specimens were selected from gravity core PS128_2-3, which was recovered from Bungenstock Plateau (eastern Weddell Sea off Dronning Maud Land 69.4107°S, 5.5890°W ) from 1868 m water depth during R/V POLASTERN Cruise PS128 in 2022 (Tiedemann and Müller, 2022). Sampling and analytical studies were carried out from ~88 to 430 cm core depth at ~2 cm spatial resolution. The records cover the last ~74.5 kyrs. The geochemical analyses were performed on a VARIAN 720–ES Axial ICP-OES, a simultaneous, axial-viewing inductively coupled plasma optical emission spectrometer coupled to a VARIAN SP3 sample preparation system at GEOMAR. Mg/Ca ratios (mmol/mol) were converted into subsurface temperature (SubST; °C) . Contaminant phases are added: Sr/Ca, Ba/Ca, Al/Ca, Fe/Ca, Mn/Ca in mmol/mol).
Keyword(s):
East Antarctica; Eastern Weddell Sea; Glacial Weddell Polynya; Mg/Ca; Neogloboquadrina pachyderma sinistral; Warm Deep Water; δ18Osw-ivc
Supplement to:
Pinho, Tainã Marcos Lima; Nürnberg, Dirk; Meckler, Anna Nele; Mollenhauer, Gesine; Müller, Juliane; Lohmann, Gerrit; Lembke-Jene, Lester; Hidayat, Salma; Rigalleau, Vincent; Lamy, Frank; Tiedemann, Ralf (2026): Millennial-to-orbital-scale subsurface ocean warming and Polynya formation off Dronning Maud Land during the last glacial. Nature Communications, 17(1), 2440, https://doi.org/10.1038/s41467-026-70498-w
References:
Tiedemann, Ralf; Müller, Juliane (2022): The Expedition PS128 of the Research Vessel POLARSTERN to the Weddell Sea, Lazarew Sea, Riiser-Larsen Sea, Cosmonaut Sea and Cooperation Sea in 2022. Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 764, 235 pp, https://doi.org/10.57738/BzPM_0764_2022
Funding:
Coverage:
Latitude: -69.411694 * Longitude: -5.587413
Date/Time Start: 2022-01-17T00:54:00 * Date/Time End: 2022-01-17T00:54:00
Minimum DEPTH, sediment/rock: 0.885 m * Maximum DEPTH, sediment/rock: 4.295 m
Event(s):
PS128_2-3 * Latitude: -69.411694 * Longitude: -5.587413 * Date/Time: 2022-01-17T00:54:00 * Elevation: -1868.0 m * O2A Registry URI: https://registry.o2a-data.de/items/3165 * Location: Weddell Sea * Campaign: PS128 (EASI-1) * Basis: Polarstern * Method/Device: Gravity corer (GC)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
DEPTH, sediment/rockDepth sedmPinho, Tainã Marcos LimaGeocode
AGEAgeka BPPinho, Tainã Marcos LimaGeocode
Neogloboquadrina pachyderma, Magnesium/Calcium ratioN. pachyderma Mg/Cammol/molPinho, Tainã Marcos LimaInductively coupled plasma-optical emission spectrometry (ICP-OES), Varian 720-ES Axial; coupled to a VARIAN SP3 sample preparation system
Neogloboquadrina pachyderma sinistral, Strontium/Calcium ratioN. pachyderma s Sr/Cammol/molPinho, Tainã Marcos LimaInductively coupled plasma-optical emission spectrometry (ICP-OES), Varian 720-ES Axial; coupled to a VARIAN SP3 sample preparation system
Neogloboquadrina pachyderma sinistral, Barium/Calcium ratioN. pachyderma sin B/Cammol/molPinho, Tainã Marcos LimaInductively coupled plasma-optical emission spectrometry (ICP-OES), Varian 720-ES Axial; coupled to a VARIAN SP3 sample preparation system
Neogloboquadrina pachyderma sinistral, Aluminium/Calcium ratioN. pachyderma s Al/Cammol/molPinho, Tainã Marcos LimaInductively coupled plasma-optical emission spectrometry (ICP-OES), Varian 720-ES Axial; coupled to a VARIAN SP3 sample preparation system
Neogloboquadrina pachyderma sinistral, Iron/Calcium ratioN. pachyderma s Fe/Cammol/molPinho, Tainã Marcos LimaInductively coupled plasma-optical emission spectrometry (ICP-OES), Varian 720-ES Axial; coupled to a VARIAN SP3 sample preparation system
Neogloboquadrina pachyderma sinistral, Manganese/Calcium ratioN. pachyderma s Mn/Cammol/molPinho, Tainã Marcos LimaInductively coupled plasma-optical emission spectrometry (ICP-OES), Varian 720-ES Axial; coupled to a VARIAN SP3 sample preparation system
Sub-surface temperatureSubT°CPinho, Tainã Marcos LimaCalculated from Mg/Ca ratios
10 δ18O, ice volume free, seawaterδ18O ivf sw‰ SMOWPinho, Tainã Marcos LimaCalculatedδ18Osw-ivc
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1797 data points

Data

Download dataset as tab-delimited text — use the following character encoding:


Depth sed [m]

Age [ka BP]

N. pachyderma Mg/Ca [mmol/mol]

N. pachyderma s Sr/Ca [mmol/mol]

N. pachyderma sin B/Ca [mmol/mol]

N. pachyderma s Al/Ca [mmol/mol]

N. pachyderma s Fe/Ca [mmol/mol]

N. pachyderma s Mn/Ca [mmol/mol]

SubT [°C]
10 
δ18O ivf sw [‰ SMOW]
0.88518.2200.6101.6820.0030.0640.0340.016-2.100-0.631
0.89518.4930.6371.6820.0040.0280.0160.019-1.891-0.574
0.90518.7430.6721.7050.0040.1060.0310.021-1.616-0.443
0.91518.8840.6461.6630.0030.0840.0140.019-1.818-0.438
0.92519.0250.6871.6660.0030.0260.0100.023-1.503-0.393
0.94519.3060.7871.6580.0030.1080.0130.022-0.717-0.145
0.95519.4470.7601.6670.0030.0210.0100.030-0.934-0.177
0.96519.5860.7431.6670.0020.1300.0060.023-1.063-0.149
0.97519.7270.8141.6870.0050.0610.0290.035-0.506-0.049
0.99520.1340.7661.6620.0020.0350.0100.041-0.880-0.215
1.04520.9560.9441.6310.0020.1200.0420.0490.5110.089
1.06521.3450.8851.6690.0030.0200.0160.0510.050-0.021
1.09522.1710.9151.6240.0030.0370.0080.0590.280-0.046
1.12522.7380.9171.6500.0030.0500.0350.0730.298-0.039
1.14523.0190.8681.6590.0030.0180.0080.059-0.085-0.214
1.16523.5370.9801.6520.0060.0570.0340.0890.789-0.059
1.18524.3450.8861.6580.0030.0360.0150.0820.053-0.056
1.19524.7360.8871.6680.0030.0170.0040.0790.064-0.197
1.20525.1260.9781.6210.0030.0320.0130.0770.7760.114
1.29528.5740.9041.6400.0020.0620.0040.0870.195-0.314
1.30528.9490.9221.6520.0040.0600.0260.0810.333-0.160
1.32529.8960.7911.6110.0010.0100.0100.057-0.687-0.389
1.34530.9300.9551.6230.0030.0790.0180.0840.595-0.410
1.38532.4170.7941.6080.0020.0120.0020.067-0.664-0.232
1.42533.7130.9301.6310.0030.0600.0290.0830.3960.055
1.44534.2300.9851.6440.0040.1120.0480.0770.832-0.053
1.46534.8490.9721.6400.0040.1820.1050.0740.730-0.027
1.48535.6491.1201.6460.0240.3930.2810.0621.8830.334
1.49536.0261.0331.6370.0120.1850.1760.0711.2050.141
1.52537.0900.8641.6120.0040.1300.0290.072-0.118-0.287
1.54537.8790.7191.6620.0020.0120.0030.050-1.248-0.770
1.56538.5410.8841.6460.0030.0470.0220.0650.039-0.200
1.58539.1170.8501.6540.0070.0280.0150.059-0.226-0.183
1.59539.4150.7721.6560.0030.0440.0280.039-0.833-0.534
1.60539.7410.8461.6500.0060.0320.0140.052-0.257-0.224
1.66540.9030.7531.6310.0040.0680.0200.024-0.984-0.613
1.68541.3670.6491.6510.0020.3520.0270.016-1.796-0.767
1.69541.6100.7911.6730.0080.1600.0150.018-0.685-0.569
1.70541.8310.6591.6950.0030.2120.0320.011-1.715-0.839
1.72542.1590.6511.7080.0010.0980.0090.011-1.785-0.932
1.76542.8200.9021.6570.0200.3010.2400.0290.177-0.365
1.78543.0740.6211.6960.0020.0460.0230.014-2.014-0.971
1.79543.1990.6351.6630.0160.0800.0370.012-1.906-0.877
1.80543.3260.5781.7150.0020.0600.0020.010-2.352-1.045
1.84543.9690.5271.6850.0020.1940.0050.000-2.747-1.093
1.86544.2680.6511.6650.0220.1190.0430.014-1.783-0.840
1.89544.7580.6401.6580.0040.1550.0530.018-1.865-0.846
1.90544.9090.6411.6910.0020.0310.0090.015-1.859-0.869
1.91545.0560.7481.6750.0050.0380.0320.023-1.022-0.599
1.92545.2060.6801.6510.0030.0430.0200.021-1.553
1.93545.3670.7501.6890.0030.2530.1100.018-1.005
1.94545.5210.7131.6410.0080.1040.0170.025-1.298-0.799
1.95545.6740.6401.6860.0040.0580.0110.018-1.864-1.021
1.96545.8110.8151.6400.0040.0610.1210.022-0.500-0.546
1.97545.9600.5521.6660.0010.0960.0040.012-2.557-1.191
2.00546.4190.6621.6520.0030.0550.0140.016-1.696-0.773
2.01546.5500.6521.6500.0020.0880.0280.014-1.773-0.762
2.02546.6840.6281.6610.0090.0460.0200.013-1.957-1.017
2.03546.8230.6351.6560.0070.0740.0200.014-1.905-1.110
2.04546.9660.9111.6650.0090.1950.1940.0300.254-0.390
2.06547.2230.8411.6470.0680.6610.1610.016-0.295-0.432
2.08547.4590.6881.6560.0060.0950.0280.018-1.490-0.866
2.10547.6800.6611.6910.0040.1280.0870.015-1.701-0.926
2.12547.9220.6131.6830.0050.0700.0150.011-2.080-0.992
2.14548.1630.6811.6990.0060.1150.0420.011-1.544-0.907
2.16548.3940.6361.6610.0020.0470.0220.011-1.899-0.940
2.20548.8710.7421.6750.0020.0690.0460.019-1.073-0.491
2.21548.9980.7321.6690.0030.0470.0290.019-1.149-0.532
2.22549.1260.7111.6680.002-0.0260.0290.019-1.311-0.649
2.23549.2520.8051.6670.0130.1760.0810.023-0.577-0.314
2.24549.3730.7931.6530.0020.1460.0290.017-0.674-0.346
2.25549.4910.7151.6410.0020.1260.0240.023-1.285-0.571
2.26549.6160.7581.6630.0070.0790.0410.030-0.942-0.435
2.27549.7420.8361.6590.0040.2370.0760.024-0.333-0.557
2.28549.8690.7821.6640.0020.0740.0120.023-0.757-0.505
2.29549.9970.8681.6340.0050.1300.0580.031-0.085-0.192
2.31550.2380.8451.6310.0040.1450.0290.024-0.265-0.396
2.33550.4870.7831.6290.0070.4170.1250.016-0.748-0.661
2.35550.7390.7951.6350.0100.3080.0670.025-0.657-0.564
2.37550.9840.7711.6660.0030.8310.0430.005-0.847-0.593
2.39551.2280.7171.6340.0030.1330.0410.028-1.263-0.753
2.43551.7290.6631.6800.0030.0780.0200.022-1.689-0.815
2.45551.9690.7111.6660.0040.0170.0520.027-1.311-0.703
2.46552.0890.6851.6640.0030.0690.0280.024-1.517-0.741
2.48552.3410.7841.6660.0030.1820.1100.029-0.741-0.471
2.49552.4710.7541.6390.0080.0870.0320.034-0.973-0.435
2.51552.7160.6941.6650.0020.1540.0090.022-1.444-0.559
2.52552.8360.8001.6480.0070.2600.1250.035-0.618-0.297
2.53552.9620.7471.6500.0030.0730.0410.028-1.035-0.312
2.56553.3300.7241.6380.0030.1070.0320.027-1.211-0.628
2.57553.4550.6361.6540.0030.1520.0260.015-1.900-0.892
2.58553.5830.7821.6360.0040.1780.1240.037-0.761-0.612
2.59553.7110.8251.6720.0030.2810.0910.023-0.419-0.314
2.60553.8370.6661.6510.0020.0620.0210.020-1.665-0.752
2.61553.9550.7721.6320.003-0.0140.0580.030-0.832-0.623
2.62554.0760.6311.6550.0030.0770.0240.022-1.934-0.807
2.63554.1990.7331.6380.0020.0610.0310.025-1.144-0.567
2.64554.3270.7581.6640.0090.1400.0560.031-0.942-0.649
2.67554.6920.7361.6680.0040.0840.0290.031-1.118-0.568
2.68554.8130.8531.6670.0040.1950.1230.040-0.203-0.340
2.69554.9370.7421.6660.0020.0330.0360.034-1.068-0.608
2.70555.0620.7701.6740.0050.1640.0730.048-0.855-0.542
2.71555.1760.7191.6340.0030.0600.0240.029-1.250-0.524
2.72555.2950.7041.6590.0040.0140.0470.030-1.367-0.491
2.73555.4160.7701.6460.0040.2080.0330.028-0.851-0.404
2.74555.5390.7401.6720.0030.1370.0690.027-1.090-0.484
2.75555.6630.7491.6290.0020.1180.0380.037-1.017-0.461
2.76555.7730.7911.6280.0040.1290.0320.041-0.687-0.504
2.78556.0030.7661.6330.0040.0810.0420.025-0.881-0.597
2.79556.1230.7181.6480.0020.0600.0220.030-1.254-0.557
2.81556.4001.0361.6390.0130.5580.2660.0331.229-0.065
2.82556.5660.9951.6490.0090.2090.2120.0500.903-0.195
2.83556.7430.6721.6440.0020.0390.0090.030-1.615-0.770
2.84556.9160.7971.6380.0050.0750.0350.024-0.639-0.498
2.85557.0760.7751.6730.0040.0960.1200.037-0.813-0.423
2.86557.2900.7931.6300.0030.0840.0630.036-0.671-0.337
2.87557.5200.8981.6610.0030.3420.2360.0340.147-0.171
2.88557.7501.0071.6370.0060.5500.2610.0321.0010.031
2.89557.9670.8151.6350.0030.1240.0400.037-0.499
2.90558.1770.8761.6590.0050.1180.1400.036-0.021-0.218
2.91558.3870.7091.6240.0020.0450.0330.033-1.328-0.524
2.92558.6100.8071.6450.0040.1030.0530.040-0.563-0.409
2.93558.8450.9131.6710.0030.0640.0410.0320.267-0.126
2.94559.0820.8021.6230.0040.1310.0520.044-0.605-0.534
2.96559.4820.6721.6510.0020.2180.0260.021-1.616-0.702
2.97559.6530.7961.6730.0030.1600.0630.040-0.646-0.349
2.98559.8420.7961.6320.0020.0740.0240.043-0.651-0.325
2.99560.0280.6951.6390.0020.0800.0030.026-1.434-0.402
3.00560.2080.7421.6770.0110.1310.0860.026-1.068-0.381
3.01560.3260.6981.6480.0020.0150.0120.033-1.418-0.322
3.02560.4330.6151.6640.0010.1210.0200.019-2.065-0.672
3.03560.5370.6451.6400.0030.0530.0290.030-1.831-0.535
3.04560.6350.7631.6300.0020.2070.0960.055-0.910-0.198
3.07560.9510.5791.6870.0010.1790.0120.019-2.347-0.613
3.08561.0600.6031.6860.0020.0910.0220.015-2.155-0.440
3.09561.1640.6011.7030.0020.1400.0380.013-2.175-0.709
3.10561.2630.6401.6970.0040.0880.0400.013-1.869-0.376
3.11561.3740.6151.6670.0010.1410.0320.013-2.064-0.480
3.12561.4860.5831.6780.0020.0500.0290.016-2.312-0.509
3.13561.5970.5661.6790.0010.0320.0180.014-2.449-0.445
3.14561.7030.7081.6770.0020.2750.0840.020-1.338-0.052
3.15561.8110.7181.6850.0010.0840.0490.019-1.254-0.344
3.16561.9220.6131.6990.0030.3010.0750.014-2.077-0.730
3.17562.0300.6641.7060.0020.0880.0390.019-1.676-0.439
3.18562.1420.6101.6780.0010.0420.0250.015-2.104-0.547
3.19562.2500.7281.6850.0020.1250.0650.021-1.178-0.437
3.20562.3550.6951.6810.0010.0310.0040.019-1.435-0.341
3.22562.5740.7351.6950.0040.2400.0560.022-1.129-0.294
3.23562.6850.6771.6910.0010.1070.0330.026-1.577-0.455
3.24562.7950.6871.6630.0010.1440.0370.022-1.504-0.399
3.25562.8980.8131.6450.0020.1450.0500.030-0.517-0.177
3.26563.0060.7241.6650.0020.0310.0150.031-1.211-0.429
3.27563.1130.6771.6520.0020.0630.0150.026-1.579-0.474
3.28563.2230.7751.6640.0030.0750.0250.037-0.815-0.279
3.29563.3300.8811.6570.0020.1330.0860.0360.017-0.029
3.30563.4360.8051.6470.0030.1710.0990.044-0.577-0.209
3.31563.5420.7811.6700.0020.0720.0200.042-0.763-0.213
3.32563.6500.8401.6590.0030.1910.0510.046-0.302-0.018
3.33563.7590.9141.6560.0060.1930.1130.0560.2760.099
3.34563.8680.9101.6490.0030.1740.0590.0530.2440.143
3.35563.9780.9441.6460.0030.3180.1650.0550.5100.056
3.36564.0860.8781.6470.0040.1380.0730.060-0.007-0.038
3.37564.1970.8671.6470.0080.4290.0980.065-0.094-0.106
3.38564.3100.8121.6630.0020.1460.0410.049-0.523-0.270
3.39564.4240.7411.6540.0020.0930.0280.046-1.076-0.356
3.40564.5350.8611.6610.0020.1650.0640.063-0.142-0.090
3.43564.8560.7871.6440.0040.1720.0880.053-0.716-0.308
3.44564.9670.7421.6580.0020.0740.0360.050-1.074-0.422
3.45565.0760.9681.6350.0050.4400.2410.0630.6920.067
3.46565.1890.7361.6330.0030.0770.0300.062-1.119-0.372
3.47565.2990.7711.6410.0020.0710.0240.063-0.840-0.413
3.48565.4130.7371.6570.0020.0650.0240.056-1.106-0.408
3.49565.5240.7281.6460.0020.0270.0130.065-1.178-0.452
3.52565.8580.7881.6740.0020.0380.0260.056-0.713-0.416
3.57566.3960.7951.6560.004-0.0060.0280.081-0.659-0.251
3.58566.5080.7921.6620.005-0.0080.0240.096-0.681-0.307
3.59566.6200.8111.6580.0030.0390.0420.082-0.530-0.282
3.62566.9420.8851.6370.0050.0470.1080.0810.048-0.225
3.63567.0480.8731.6590.0030.0510.0320.096-0.045-0.176
3.64567.1590.8811.6510.0050.0980.0760.0860.018-0.103
3.65567.2700.7971.6600.003-0.0220.0340.091-0.640-0.327
3.66567.3720.7961.6610.0050.0630.0900.078-0.645-0.474
3.67567.4720.9571.6530.0050.2040.2480.0920.609-0.007
3.69567.6850.8941.6530.0040.0650.0450.1130.120-0.289
3.70567.7930.7641.6630.003-0.0450.0100.085-0.899-0.507
3.70567.7930.7711.6630.002-0.0210.0250.084-0.848-0.493
3.71567.8910.7571.6700.002-0.0180.0160.081-0.955-0.525
3.72567.9880.9941.6310.0060.1790.0620.1340.898-0.045
3.74568.1920.9011.6400.0050.0380.0490.1070.173-0.164
3.75568.2980.8491.6560.0030.0540.0410.104-0.237-0.235
3.76568.4100.8131.6450.004-0.0110.0220.099-0.518-0.133
3.77568.5230.9251.6550.0070.1360.1350.1030.3610.273
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