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Abelmann, Andrea; Gersonde, Rainer; Knorr, Gregor; Zhang, Xu; Chapligin, Bernhard; Maier, Edith; Esper, Oliver; Friedrichsen, Hans; Lohmann, Gerrit; Meyer, Hanno; Tiedemann, Ralf (2015): The seasonal sea-ice zone in the glacial Southern Ocean as a carbon sink, supplementary datasets [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.854121, Supplement to: Abelmann, A et al. (2015): The seasonal sea-ice zone in the glacial Southern Ocean as a carbon sink. Nature Communications, 6, 8136, https://doi.org/10.1038/ncomms9136

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Abstract:
Reduced surface-deep ocean exchange and enhanced nutrient consumption by phytoplankton in the Southern Ocean have been linked to lower glacial atmospheric CO2. However, identification of the biological and physical conditions involved and the related processes remains incomplete. Here we specify Southern Ocean surface-subsurface contrasts using a new tool, the combined oxygen and silicon isotope measurement of diatom and radiolarian opal, in combination with numerical simulations. Our data do not indicate a permanent glacial halocline related to melt water from icebergs. Corroborated by numerical simulations, we find that glacial surface stratification was variable and linked to seasonal sea-ice changes. During glacial spring-summer, the mixed layer was relatively shallow, while deeper mixing occurred during fall-winter, allowing for surface-ocean refueling with nutrients from the deep reservoir, which was potentially richer in nutrients than today. This generated specific carbon and opal export regimes turning the glacial seasonal sea-ice zone into a carbon sink.
Project(s):
Paleoenvironmental Reconstructions from Marine Sediments @ AWI (AWI_Paleo)
Coverage:
Median Latitude: -51.293999 * Median Longitude: -2.816960 * South-bound Latitude: -59.465300 * West-bound Longitude: -25.700000 * North-bound Latitude: -41.748167 * East-bound Longitude: 4.476000
Date/Time Start: 1989-11-11T21:40:00 * Date/Time End: 2002-12-07T15:36:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
12 datasets

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Datasets listed in this publication series

  1. Abelmann, A; Gersonde, R; Knorr, G et al. (2015): (Supplementary Table 1) ICP-OES and EDS measurements of major elements in sediment core PS1768-8. https://doi.org/10.1594/PANGAEA.854107
  2. Abelmann, A; Gersonde, R; Knorr, G et al. (2015): (Supplementary Table 2) Vertical abundances of the radiolarian species Actinomma antarctica and Spongotrochus glacialis from four plankton stations. https://doi.org/10.1594/PANGAEA.854108
  3. Abelmann, A; Gersonde, R; Knorr, G et al. (2015): (Supplementary Table 3) d30Si_rad values from surface sediment samples. https://doi.org/10.1594/PANGAEA.854109
  4. Abelmann, A; Gersonde, R; Knorr, G et al. (2015): (Supplementary Table 4) Parameters used for the estimation of Holocene and Glacial d30Si_Si(OH)4 values compared to Si(OH)4 values from field data. https://doi.org/10.1594/PANGAEA.854111
  5. Abelmann, A; Gersonde, R; Knorr, G et al. (2015): (Supplementary Table 5) Age pointers for PS1768-8. https://doi.org/10.1594/PANGAEA.854112
  6. Abelmann, A; Gersonde, R; Knorr, G et al. (2015): (Supplementary Table 6) Age pointers for PS1778-5. https://doi.org/10.1594/PANGAEA.854113
  7. Abelmann, A; Gersonde, R; Knorr, G et al. (2015): (Supplementary Table 7) d30Si_diat and delta 30Si_rad values from surface sediments close to the core sites PS1768-8 and PS1778-5. https://doi.org/10.1594/PANGAEA.854115
  8. Abelmann, A; Gersonde, R; Knorr, G et al. (2015): (Supplementary Table 8) Oxygen and silicon isotope data from diatom opal (10-40 µm fraction) in core PS1768-8. https://doi.org/10.1594/PANGAEA.854116
  9. Abelmann, A; Gersonde, R; Knorr, G et al. (2015): (Supplementary Table 9) Oxygen isotope data from radiolarian opal of the >250 µm fraction from core PS1768-8. https://doi.org/10.1594/PANGAEA.854117
  10. Abelmann, A; Gersonde, R; Knorr, G et al. (2015): (Supplementary Table 10) Silicon isotope data from radiolarian opal of the >250 µm and 125-250μm fractions from core PS1768-8. https://doi.org/10.1594/PANGAEA.854118
  11. Abelmann, A; Gersonde, R; Knorr, G et al. (2015): (Supplementary Table 11) Oxygen and silicon isotope data from diatom opal (10-40 µm fraction) in core PS1778-5. https://doi.org/10.1594/PANGAEA.854119
  12. Abelmann, A; Gersonde, R; Knorr, G et al. (2015): (Supplementary Table 12) Oxygen and silicon isotope data from radiolarian opal of the >125 µm fraction from core PS1778-5. https://doi.org/10.1594/PANGAEA.854120