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Benz, Verena; Esper, Oliver; Gersonde, Rainer; Lamy, Frank; Tiedemann, Ralf (2016): Age models and summer sea surface temperature and winter sea ice concentration for the EPILOG-LGM time slice in the Pacific Southern Ocean. PANGAEA, https://doi.org/10.1594/PANGAEA.849115, Supplement to: Benz, V et al. (2016): Last Glacial Maximum sea surface temperature and sea-ice extent in the Pacific sector of the Southern Ocean. Quaternary Science Reviews, 146, 216-237, https://doi.org/10.1016/j.quascirev.2016.06.006

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Abstract:
Sea surface temperatures and sea-ice extent are the most critical variables to evaluate the Southern Ocean paleoceanographic evolution in relation to the development of the global carbon cycle, atmospheric CO2 variability and ocean-atmosphere circulation. In contrast to the Atlantic and the Indian sectors, the Pacific sector of the Southern Ocean has been insufficiently investigated so far. To cover this gap of information we present diatom-based estimates of summer sea surface temperature (SSST) and winter sea-ice concentration (WSI) from 17 sites in the polar South Pacific to study the Last Glacial Maximum (LGM) at the EPILOG time slice (19,000-23,000 cal. years BP). Applied statistical methods are the Imbrie and Kipp Method (IKM) and the Modern Analog Technique (MAT) to estimate temperature and sea-ice concentration, respectively. Our data display a distinct LGM east-west differentiation in SSST and WSI with steeper latitudinal temperature gradients and a winter sea-ice edge located consistently north of the Pacific-Antarctic Ridge in the Ross sea sector. In the eastern sector of our study area, which is governed by the Amundsen Abyssal Plain, the estimates yield weaker latitudinal SSST gradients together with a variable extended winter sea-ice field. In this sector, sea-ice extent may have reached sporadically the area of the present Subantarctic Front at its maximum LGM expansion. This pattern points to topographic forcing as major controller of the frontal system location and sea-ice extent in the western Pacific sector whereas atmospheric conditions like the Southern Annular Mode and the ENSO affected the oceanographic conditions in the eastern Pacific sector. Although it is difficult to depict the location and the physical nature of frontal systems separating the glacial Southern Ocean water masses into different zones, we found a distinct temperature gradient in latitudes straddled by the modern Southern Subtropical Front. Considering that the glacial temperatures north of this zone are similar to the modern, we suggest that this represents the Glacial Southern Subtropical Front (GSSTF), which delimits the zone of strongest glacial SSST cooling (>4K) to its North. The southern boundary of the zone of maximum cooling is close to the glacial 4°C isotherm. This isotherm, which is in the range of SSST at the modern Antarctic Polar Front (APF), represents a circum-Antarctic feature and marks the northern edge of the glacial Antarctic Circumpolar Current (ACC). We also assume that a glacial front was established at the northern average winter sea ice edge, comparable with the modern Southern Antarctic Circumpolar Current Front (SACCF). During the glacial, this front would be located in the area of the modern APF. The northward deflection of colder than modern surface waters along the South American continent leads to a significant cooling of the glacial Humboldt Current surface waters (4-8K), which affects the temperature regimes as far north as into tropical latitudes. The glacial reduction of ACC temperatures may also result in the significant cooling in the Atlantic and Indian Southern Ocean, thus may enhance thermal differentiation of the Southern Ocean and Antarctic continental cooling. Comparison with temperature and sea ice simulations for the last glacial based on numerical simulations show that the majority of modern models overestimate summer and winter sea ice cover and that there exists few models that reproduce our temperature data rather well.
Coverage:
Median Latitude: -58.729754 * Median Longitude: -142.789862 * South-bound Latitude: -63.694330 * West-bound Longitude: -172.701000 * North-bound Latitude: -52.812170 * East-bound Longitude: -107.805500
Date/Time Start: 2001-03-19T18:34:00 * Date/Time End: 2010-01-17T20:00:00
Size:
29 datasets

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Datasets listed in this publication series

  1. Benz, V; Esper, O; Gersonde, R et al. (2016): Age determination of sediment core PS58/271-1. https://doi.org/10.1594/PANGAEA.860738
  2. Benz, V; Esper, O; Gersonde, R et al. (2016): Age determination of sediment core PS58/274-1. https://doi.org/10.1594/PANGAEA.860739
  3. Benz, V; Esper, O; Gersonde, R et al. (2016): Age determination of sediment core PS75/059-2. https://doi.org/10.1594/PANGAEA.860740
  4. Benz, V; Esper, O; Gersonde, R et al. (2016): Age determination of sediment core PS75/064-1. https://doi.org/10.1594/PANGAEA.860741
  5. Benz, V; Esper, O; Gersonde, R et al. (2016): Age determination of sediment core PS75/072-4. https://doi.org/10.1594/PANGAEA.860742
  6. Benz, V; Esper, O; Gersonde, R et al. (2016): Age determination of sediment core PS75/073-2. https://doi.org/10.1594/PANGAEA.860743
  7. Benz, V; Esper, O; Gersonde, R et al. (2016): Age determination of sediment core PS75/085-1. https://doi.org/10.1594/PANGAEA.860744
  8. Benz, V; Esper, O; Gersonde, R et al. (2016): Age determination of sediment core PS75/093-1. https://doi.org/10.1594/PANGAEA.860745
  9. Benz, V; Esper, O; Gersonde, R et al. (2016): Age model of sediment core PS58/270-5. https://doi.org/10.1594/PANGAEA.849113
  10. Benz, V; Esper, O; Gersonde, R et al. (2016): Age model of sediment core PS58/271-1. https://doi.org/10.1594/PANGAEA.849114
  11. Benz, V; Esper, O; Gersonde, R et al. (2016): Age model of sediment core PS58/274-1. https://doi.org/10.1594/PANGAEA.849174
  12. Benz, V; Esper, O; Gersonde, R et al. (2016): Age model of sediment core PS75/051-1. https://doi.org/10.1594/PANGAEA.849175
  13. Benz, V; Esper, O; Gersonde, R et al. (2016): Age model of sediment core PS75/054-1. https://doi.org/10.1594/PANGAEA.849176
  14. Benz, V; Esper, O; Gersonde, R et al. (2016): Age model of sediment core PS75/056-1. https://doi.org/10.1594/PANGAEA.849177
  15. Benz, V; Esper, O; Gersonde, R et al. (2016): Age model of sediment core PS75/059-2. https://doi.org/10.1594/PANGAEA.849178
  16. Benz, V; Esper, O; Gersonde, R et al. (2016): Age model of sediment core PS75/064-1. https://doi.org/10.1594/PANGAEA.849179
  17. Benz, V; Esper, O; Gersonde, R et al. (2016): Age model of sediment core PS75/072-4. https://doi.org/10.1594/PANGAEA.849180
  18. Benz, V; Esper, O; Gersonde, R et al. (2016): Age model of sediment core PS75/073-2. https://doi.org/10.1594/PANGAEA.849181
  19. Benz, V; Esper, O; Gersonde, R et al. (2016): Age model of sediment core PS75/076-2. https://doi.org/10.1594/PANGAEA.849182
  20. Benz, V; Esper, O; Gersonde, R et al. (2016): Age model of sediment core PS75/082-1. https://doi.org/10.1594/PANGAEA.849183
  21. Benz, V; Esper, O; Gersonde, R et al. (2016): Age model of sediment core PS75/085-1. https://doi.org/10.1594/PANGAEA.849184
  22. Benz, V; Esper, O; Gersonde, R et al. (2016): Age model of sediment core PS75/091-3. https://doi.org/10.1594/PANGAEA.849185
  23. Benz, V; Esper, O; Gersonde, R et al. (2016): Age model of sediment core PS75/093-1. https://doi.org/10.1594/PANGAEA.849186
  24. Benz, V; Esper, O; Gersonde, R et al. (2016): Age model of sediment core PS75/096-4. https://doi.org/10.1594/PANGAEA.849187
  25. Benz, V; Esper, O; Gersonde, R et al. (2016): Age model of sediment core PS75/097-4. https://doi.org/10.1594/PANGAEA.849188
  26. Benz, V; Esper, O; Gersonde, R et al. (2016): Stable oxygen isotope record of Neogloboquadrina pachyderma (s) of sediment core PS75/072-4. https://doi.org/10.1594/PANGAEA.860735
  27. Benz, V; Esper, O; Gersonde, R et al. (2016): Stable oxygen isotope record of Neogloboquadrina pachyderma (s) of sediment core PS75/073-2. https://doi.org/10.1594/PANGAEA.860736
  28. Benz, V; Esper, O; Gersonde, R et al. (2016): Stable oxygen isotope record of Neogloboquadrina pachyderma (s) of sediment core PS75/085-1. https://doi.org/10.1594/PANGAEA.860737
  29. Benz, V; Esper, O; Gersonde, R et al. (2016): Summer sea surface temperature and winter sea ice concentration for the EPILOG-LGM time slice in the Pacific Southern Ocean. https://doi.org/10.1594/PANGAEA.849112