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- W2108518097 abstract "Abstract We evaluated a 10 year time series of δ 18 O and δ 13 C records from three planktic foraminifers ( Neogloboquadrina pachyderma , Globigerina umbilicata , and Globigerinita glutinata ) in the Bering Sea and central subarctic Pacific with a focus on their responses to environmental changes. Foraminiferal δ 18 O followed the equilibrium equation for inorganic calcite, with species‐specific equilibrium offsets ranging from nearly zero (−0.02‰ for N. pachyderma and −0.01‰ for G. umbilicata ) to −0.16‰ ( G. glutinata ). Equilibrium offsets in our sediment trap samples were smaller than those from plankton tow studies, implying that foraminiferal δ 18 O was modified by encrustation during settling. Habitat/calcification depths varied from 35–55 m ( N. pachyderma and G. umbilicata ) or 25–45 m ( G. glutinata ) during warm, stratified seasons to around 100 m during winter, when the mixed layer depth increases. Unlike δ 18 O, foraminiferal δ 13 C showed species‐specific responses to environmental changes. We found a dependency of δ 13 C in G. umbilicata on CO 3 2− concentrations in ambient seawater that agreed reasonably well with published laboratory results, suggesting that δ 13 C of G. umbilicata is subject to vital effects. In contrast, δ 13 C of N. pachyderma and G. glutinata are likely affected by other species‐specific biological activities. Seasonal flux patterns reveal that fossil records of N. pachyderma and G. glutinata represent annual mean conditions, whereas that of G. umbilicata most likely indicates those of a specific season. Because none of these three taxa was abundant from December to February, their fossil records likely do not reflect isotope signals from cold seasons." @default.
- W2108518097 created "2016-06-24" @default.
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- W2108518097 date "2015-10-01" @default.
- W2108518097 modified "2023-09-28" @default.
- W2108518097 title "Seasonal variability of δ 18 O and δ 13 C of planktic foraminifera in the Bering Sea and central subarctic Pacific during 1990–2000" @default.
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- W2108518097 doi "https://doi.org/10.1002/2015pa002801" @default.
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