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De Pol-Holz, Ricardo; Keigwin, Lloyd D; Southon, John R; Hebbeln, Dierk; Mohtadi, Mahyar (2010): (Table S1) Radiocarbon data of sediment core SO161/5 22SL [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.735788, Supplement to: De Pol-Holz, R et al. (2010): No signature of abyssal carbon in intermediate waters off Chile during deglaciaition. Nature Geoscience, 3(3), 192-195, https://doi.org/10.1038/ngeo745

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Abstract:
At the end of the Last Glacial Maximum (19,000 to 11,000 years ago), atmospheric carbon dioxide concentrations rose while the Delta14C of atmospheric carbon dioxide declined**1, 2. These changes have been attributed to an injection of carbon dioxide with low radiocarbon activity from an oceanic abyssal reservoir that was isolated from the atmosphere for several thousand years before deglaciation**3. The current understanding points to the Southern Ocean as the main area of exchange between these reservoirs4. Intermediate water formed in the Southern Ocean surrounding Antarctica would have then carried the old carbon dioxide signature to the lower-latitude oceans**5, 6. Here we reconstruct the Delta14C signature of Antarctic Intermediate Water off the coast of Chile for the past 20,000 years, using paired 14C ages of benthic and planktonic foraminifera. In contrast to the above scenario, we find that the delta14C signature of the Antarctic Intermediate Water closely matches the modelled surface ocean Delta14C, precluding the influence of an old carbon source. We suggest that if the abyssal ocean is indeed the source of the radiocarbon-depleted carbon dioxide, an alternative path for the mixing and propagation of its carbon dioxide may be required to explain the observed changes in atmospheric carbon dioxide concentration and radiocarbon activity.
Project(s):
Center for Marine Environmental Sciences (MARUM)
Coverage:
Latitude: -36.219333 * Longitude: -73.675000
Date/Time Start: 2001-12-31T13:43:00 * Date/Time End: 2001-12-31T13:45:00
Minimum DEPTH, sediment/rock: 2.53 m * Maximum DEPTH, sediment/rock: 8.83 m
Event(s):
SO161/5_22SL * Latitude: -36.219333 * Longitude: -73.675000 * Date/Time Start: 2001-12-31T13:43:00 * Date/Time End: 2001-12-31T13:45:00 * Elevation: -1001.0 m * Recovery: 8.94 m * Campaign: SO161/5 (SPOC) * Basis: Sonne * Method/Device: Gravity corer (Kiel type) (SL)
Comment:
UCIAMS-64329: The large error in this measurement is due to the very small sample size (15 µg C)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 DEPTH, sediment/rockDepth sedmGeocode
2 Sample code/labelSample labelMohtadi, Mahyar
3 Taxon/taxaTaxaMohtadi, Mahyar
4 Age, datedAge datedkaMohtadi, MahyarAge, 14C AMS
5 Age, dated standard deviationAge dated std dev±Mohtadi, Mahyar
6 Calendar ageCal ageka BPMohtadi, Mahyar
7 Calendar age, standard deviationCal age std dev±Mohtadi, Mahyar
8 Δ14CΔ14C‰Mohtadi, Mahyar
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
209 data points

Data

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

1 
Depth sed [m]		2 
Sample label		3 
Taxa		4 
Age dated [ka]		5 
Age dated std dev [±]		6 
Cal age [ka BP]		7 
Cal age std dev [±]		8 
Δ14C [‰]
2.53UCIAMS-64329Mixed Planktonic Foraminifera9.160.3809.860.47
2.53UCIAMS-64330Brizalina sp.9.970.060-47
3.21OS-69278Mixed Planktonic Foraminifera11.050.05512.680.04
3.21OS-69322Uvigerina peregrina11.300.055136
3.45OS-69545Mixed Planktonic Foraminifera11.700.10013.200.10
3.45OS-69273Uvigerina peregrina12.300.08068
4.25OS-66960Mixed Planktonic Foraminifera13.050.10015.140.17
4.25OS-66829Uvigerina peregrina13.400.060177
4.91OS-66830Mixed Planktonic Foraminifera13.450.06515.810.23
4.91OS-66827Uvigerina peregrina13.700.060230
5.40OS-71076Mixed Planktonic Foraminifera14.050.09016.890.07
5.40OS-71081Mixed Benthics14.450.090277
5.65OS-71077Mixed Planktonic Foraminifera14.200.07517.000.05
5.65OS-71082Mixed Benthics14.650.090262
5.88OS-69280Mixed Planktonic Foraminifera14.650.06517.430.14
5.88OS-69274Uvigerina peregrina15.150.085249
6.19OS-66828Mixed Planktonic Foraminifera14.800.07517.630.10
6.19OS-66865Uvigerina peregrina15.050.075296
6.65OS-66831Mixed Planktonic Foraminifera15.100.07517.840.04
6.65OS-69277Uvigerina peregrina15.550.075249
6.85OS-69318G. bulloides15.350.07018.180.25
6.85OS-66864Uvigerina peregrina15.850.100254
7.25OS-69282G. bulloides15.700.08018.350.26
7.25OS-69279Uvigerina peregrina16.250.085217
7.60OS-69319G. bulloides16.000.06518.730.04
7.60OS-69323Uvigerina peregrina16.550.075228
7.85OS-69320G. bulloides16.100.07518.790.05
7.85OS-69324Uvigerina peregrina16.900.070184
8.08OS-70817Mixed Planktonic Foraminifera16.600.07019.380.13
8.08OS-70830Uvigerina peregrina17.100.075241
8.18OS-70818Mixed Planktonic Foraminifera16.850.07519.760.13
8.18OS-70831Uvigerina peregrina17.550.075228
8.33OS-70819Mixed Planktonic Foraminifera16.800.11019.670.18
8.33OS-70832Uvigerina peregrina17.550.090215
8.43OS-70820Mixed Planktonic Foraminifera16.900.08519.830.14
8.43OS-70833Uvigerina peregrina17.750.085208
8.83OS-70822Mixed Planktonic Foraminifera17.300.07020.330.08
8.83OS-70835Uvigerina peregrina18.000.100244