Max Planck Research Group for Marine Isotope Geochemistry, Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Carl-von-Ossietzky-Strasse 9-11, 26129 Oldenburg, Germany.
Department of Geosciences, University of Bremen, Klagenfurter Strasse 2-4, 28359 Bremen, Germany.
Science. 2018 Feb 23;359(6378):900-904. doi: 10.1126/science.aao2473.
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 CO 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 CO through upwelling.
在末次冰盛期，南大洋的分层作用被认为有利于碳的储存，并在冰消期由于分层作用的破坏而导致随后的释放，从而导致大气 CO2 上升。在这里，我们从南太平洋的深海到深渊水域提供了钕同位素证据，证实了末次冰盛期深水柱状分层的存在。研究结果表明，罗斯海底层水在冰期向北扩张，而南半球气候则是深分层在冰消期破裂的触发因素。这突出表明了深渊水在维持深层冰川碳库以及南半球气候变化中的重要作用，因为这是水柱状不稳定性的前提，从而导致被封存的 CO2 通过上涌而释放到大气中。
