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| Umling, Natalie E.; Thunell, Robert C.. |
| The deep ocean is most likely the primary source of the radiocarbon-depleted CO2 released to the atmosphere during the last deglaciation. While there are well-documented millennial scale Delta C-14 changes during the most recent deglaciation, most marine records lack the resolution needed to identify more rapid ventilation events. Furthermore, potential age model problems with marine Delta C-14 records may obscure our understanding of the phase relationship between inter-ocean ventilation changes. Here we reconstruct changes in deep water and thermocline radiocarbon content over the last deglaciation in the eastern equatorial Pacific (EEP) using benthic and planktonic foraminiferal C-14. Our records demonstrate that ventilation of EEP thermocline and deep... |
| Tipo: Text |
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| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00496/60794/64934.pdf |
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| Mcclymont, Erin L.; Ganeshram, Raja S.; Pichevin, Laetitia; Talbot, Helen M.; Van Dongen, Bart E.; Thunell, Robert C.; Haywood, Alan M.; Singarayer, Joy S.; Valdes, Paul J.. |
| Centennial-scale records of sea-surface temperature and opal composition spanning the Last Glacial Maximum and Termination 1 (circa 25-6 ka) are presented here from Guaymas Basin in the Gulf of California. Through the application of two organic geochemistry proxies, the U-37(K') index and the TEX86H index, we present evidence for rapid, stepped changes in temperatures during deglaciation. These occur in both temperature proxies at 13 ka (similar to 3 degrees C increase in 270 years), 10.0 ka (similar to 2 degrees C decrease over similar to 250 years) and at 8.2 ka (3 degrees C increase in <200 years). An additional rapid warming step is also observed in TEX86H at 11.5 ka. In comparing the two temperature proxies and opal content, we consider the... |
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| Ano: 2012 |
URL: https://archimer.ifremer.fr/doc/00265/37664/36972.pdf |
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