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Breakup of last glacial deep stratification in the south Pacific
Basak, C.; Fröllje, H.; Lamy, F.; Gersonde, R.; Benz, V.; Anderson, R.F.; Molina-Kescher, M.; Pahnke, K. (2018). Breakup of last glacial deep stratification in the south Pacific. Science (Wash.) 359(6378): 900-904.
In: Science (Washington). American Association for the Advancement of Science: New York, N.Y. ISSN 0036-8075; e-ISSN 1095-9203, more
Peer reviewed article  

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  • Basak, C.
  • Fröllje, H.
  • Lamy, F.
  • Gersonde, R.
  • Benz, V.
  • Anderson, R.F.
  • Molina-Kescher, M.
  • Pahnke, K.

    Stratification of the deep Southern Ocean during the Last Glacial Maximum is thought to have facilitated carbon storage and subsequent release during the deglaciation as stratification broke down, contributing to atmospheric CO2 rise. Here, we present neodymium isotope evidence from deep to abyssal waters in the South Pacific that confirms stratification of the deepwater column during the Last Glacial Maximum.The results indicate a glacial northward expansion of Ross Sea Bottom Water and a Southern Hemisphere climate trigger for the deglacial breakup of deep stratification. It highlights the important role of abyssal waters in sustaining a deep glacial carbon reservoir and Southern Hemisphere climate change as a prerequisite for the destabilization of the water column and hence the deglacial release of sequestered CO2 through upwelling.

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