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Haddam, Naoufel; Siani, Giuseppe; Michel, Elisabeth; Kaiser, Jérôme; Lamy, Frank; Duchamp-Alphonse, Stéphanie; Hefter, Jens; Braconnot, Pascale; Dewilde, Fabien; Isguder, Gulay; Tisnérat-Laborde, Nadine; Thil, François; Durand, Nicolas; Kissel, Catherine (2020): Sea surface temperatures and planktonic foraminifera d18O from the chilean margin [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.918122

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Abstract:
The comparison between different climate model simulations of water hosing experiments under glacial conditions points toward diverging responses in Sea Surface Temperature changes (SST) especially in the Southeast Pacific (SEP). This suggests that reconstituting the latitudinal SST gradient in the SEP is a critical parameter for a better understanding of the mechanisms behind the abrupt climatic events since the last glacial period. Here we present, high-resolution records of SST, using planktonic foraminiferal assemblages and alkenone temperature reconstructions and stable oxygen and carbon isotopes from three deep-sea sediment cores along a latitudinal transect off the southern Chilean coast. This allowed us to reconstruct the variations of the latitudinal SST gradient and the Subtropical Front movements in the SEP. The SST results suggest a clear Antarctic timing consistent with the bipolar seesaw control, especially during the late glacial and the deglaciation. Our records do not suggest a complete oceanic heat transfer signal, highlighting the implication of an atmospheric component in the heat transfers between the two hemispheres, controlled by the latitudinal movements of the intertropical convergence zone in the Atlantic and the associated weaker South Pacific westerly split jet. Furthermore, our records indicate variable conditions during the Holocene, and also emphasize the influence of local fresh water inputs from the Patagonian ice sheet and/or precipitation on the SST fresh water input estimates along the Chilean margin (North and South of 49° S) from the onset of the deglaciation until 8 kyr cal. BP.
Keyword(s):
chilean margin; planktonic foraminifera d18O; Sea surface temperatures during the last 22 kyrs
Supplement to:
Haddam, Naoufel; Siani, Giuseppe; Michel, Elisabeth; Kaiser, Jérôme; Lamy, Frank; Duchamp-Alphonse, Stéphanie; Hefter, Jens; Braconnot, Pascale; Dewilde, Fabien; Isguder, Gulay; Tisnérat-Laborde, Nadine; Thil, François; Durand, Nicolas; Kissel, Catherine (2018): Changes in latitudinal sea surface temperature gradients along the Southern Chilean margin since the last glacial. Quaternary Science Reviews, 194, 62-76, https://doi.org/10.1016/j.quascirev.2018.06.023
Coverage:
Median Latitude: -45.659667 * Median Longitude: -75.732017 * South-bound Latitude: -49.167833 * West-bound Longitude: -76.567167 * North-bound Latitude: -41.602167 * East-bound Longitude: -74.956667
Date/Time Start: 2007-02-09T14:34:00 * Date/Time End: 2007-02-16T03:07:00
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
10 datasets

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Datasets listed in this bundled publication

  1. Haddam, N; Siani, G; Michel, E et al. (2020): Stable oxygen iostope record of Globigerina bulloides of sediment core MD07-3082. https://doi.org/10.1594/PANGAEA.918115
  2. Haddam, N; Siani, G; Michel, E et al. (2020): Seawater oxygen iostope anomaly reconstruction for sediment core MD07-3082. https://doi.org/10.1594/PANGAEA.918112
  3. Haddam, N; Siani, G; Michel, E et al. (2020): Sea surface temperatures (SSST) of sediment core MD07-3082. https://doi.org/10.1594/PANGAEA.918109
  4. Haddam, N; Siani, G; Michel, E et al. (2020): Stable oxygen iostope record of Globigerina bulloides of sediment core MD07-3088. https://doi.org/10.1594/PANGAEA.918117
  5. Haddam, N; Siani, G; Michel, E et al. (2020): Seawater oxygen iostope anomaly reconstruction for sediment core MD07-3088. https://doi.org/10.1594/PANGAEA.918113
  6. Haddam, N; Siani, G; Michel, E et al. (2020): Sea surface temperatures (SSST) of sediment core MD07-3088. https://doi.org/10.1594/PANGAEA.918110
  7. Haddam, N; Siani, G; Michel, E et al. (2020): SST reconstruction of sediment core MD07-3088. https://doi.org/10.1594/PANGAEA.918121
  8. Haddam, N; Siani, G; Michel, E et al. (2020): Stable oxygen iostope record of Globigerina bulloides of sediment core MD07-3100. https://doi.org/10.1594/PANGAEA.918118
  9. Haddam, N; Siani, G; Michel, E et al. (2020): Seawater oxygen iostope anomaly reconstruction for sediment core MD07-3100. https://doi.org/10.1594/PANGAEA.918114
  10. Haddam, N; Siani, G; Michel, E et al. (2020): Sea surface temperatures (SSST) of sediment core MD07-3100. https://doi.org/10.1594/PANGAEA.918111