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| Roberts, Jenny; Gottschalk, Julia; Skinner, Luke C.; Peck, Victoria L.; Kender, Sev; Elderfield, Henry; Waelbroeck, Claire; Riveiros, Natalia Vazquez; Hodell, David A.. |
| Explanations of the glacial-interglacial variations in atmospheric pCO(2) invoke a significant role for the deep ocean in the storage of CO2. Deep-ocean density stratification has been proposed as a mechanism to promote the storage of CO2 in the deep ocean during glacial times. A wealth of proxy data supports the presence of a "chemical divide" between intermediate and deep water in the glacial Atlantic Ocean, which indirectly points to an increase in deep-ocean density stratification. However, direct observational evidence of changes in the primary controls of ocean density stratification, i.e., temperature and salinity, remain scarce. Here, we use Mg/Ca-derived seawater temperature and salinity estimates determined from temperature-corrected delta O-18... |
| Tipo: Text |
Palavras-chave: South Atlantic; Density gradient; Ocean stratification; Last deglaciation; Atmospheric CO2. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00421/53276/54569.pdf |
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| Qin, B.; Li, T.; Xiong, Z.; Algeo, T. J.; Jia, Q.. |
| We present a new deep‐water carbonate ion concentration ([CO32–]) record, reconstructed from the “size‐normalized weight” (SNW) of the planktonic foraminifer Neogloboquadrina dutertrei in core MD06‐3047B, representing a mid‐depth site (2.5 km) in the western tropical Pacific since 700 ka. On glacial‐interglacial timescales, deep‐water [CO32–] exhibits an inverse relationship with global sea‐level elevations, consistent with the “coral reef hypothesis” that the deep Pacific carbonate system responded to variations in shelf‐carbonate production through the past 700 kyr. On longer timescales, a decoupling between deep‐water [CO32–] and δ13C around the globe can be explained by a combination of continental weathering and nutrient inputs. During the mid‐Brunhes... |
| Tipo: Text |
Palavras-chave: Planktonic foraminifer; Shell weight; Carbonate dissolution; Coral reef hypothesis; Carbon cycles; Ocean stratification. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00455/56619/58322.pdf |
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