Persistently well-ventilated intermediate-depth ocean through the last deglaciation
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چکیده
منابع مشابه
Intensification and variability of ocean thermohaline circulation through the last deglaciation
Neodymium isotope ratios in the authigenic ferromanganese oxide component in a southeastern Atlantic core reveal a history of the global overturning circulation intensity through the last deglaciation. From a minimum during the Last Glacial Maximum (LGM), North Atlantic Deep Water (NADW) began to strengthen between 18 and 17 kyr cal. BP, approximately 2000–3000 years before the Bølling warming....
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During the last deglaciation, atmospheric carbon dioxide concentrations rose at the same time that the 114C of that CO2 fell. This has been attributed to the release of 14C-depleted carbon dioxide from the deep ocean1, possibly vented through the Southern Ocean2–5. Recently, a sediment record from the eastern North Pacific Ocean spanning the last deglaciation was interpreted to reflect transpor...
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Antarctic ice-core data reveal that the atmosphere experienced abrupt centennial increases in CO2 concentration during the last deglaciation (~18 thousand to 11 thousand years ago). Establishing the role of ocean circulation in these changes requires high-resolution, accurately dated marine records. Here, we report radiocarbon data from uranium-thorium-dated deep-sea corals in the Equatorial At...
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a r t i c l e i n f o a b s t r a c t Keywords: radiocarbon reservoir ages Southern Ocean last glaciation CO 2 climate change Marine radiocarbon (14 C) is widely used to trace ocean circulation and the 14 C levels of interior ocean water masses can provide insight into atmosphere–ocean exchange of CO 2 the since the last glaciation. Using tephras as stratigraphic tie points with which to estima...
متن کاملDirect ventilation of the North Pacific did not reach the deep ocean during the last deglaciation
[1] Despite its tremendous size, the deep North Pacific has received relatively little attention by paleoceanographers. It was recently suggested that the deep North Pacific was directly ventilated by dense waters formed in the subarctic Pacific during Heinrich Stadial 1 (HS1) of the early deglaciation. Here we present new redox-sensitive trace metal data from a sediment core at 2393m in the su...
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ژورنال
عنوان ژورنال: Nature Geoscience
سال: 2020
ISSN: 1752-0894,1752-0908
DOI: 10.1038/s41561-020-0638-6