Umfang:
Online-Ressource
ISSN:
1814-9332
Inhalt:
Abstract δ 13 δ 18 3 2 - concentration. This effect became known as the carbonate ion effect (CIE), whose role for the interpretation of marine sediment data will be investigated here in an in-depth analysis of the 13 C cycle. For this investigation, we constructed new 160 kyr long mono-specific stacks of changes in both δ 13 δ 18 Δ (δ 13 C rub) and Δ (δ 13 C sac) are very similar to each other, and a linear regression through a scatter plot of both data sets has a slope of ∼ δ 13 C, if we accept that the carbonate ion concentration changes on glacial–interglacial timescales. For a deeper understanding of the 13 C cycle, we use the Solid Earth version of the Box model of the Isotopic Carbon cYCLE (BICYLE-SE) to calculate how surface-ocean CO3 2 - should have varied over time in order to be able to calculate the potential offsets which would by caused by the CIE quantified in culture experiments. Our simulations are forced with atmospheric reconstructions of CO2 and δ 13 2 derived from ice cores to obtain a carbon cycle which should at least at the surface ocean be as close as possible to expected conditions and which in the deep ocean largely agrees with the carbon isotope ratio of dissolved inorganic carbon (DIC), δ 13 C DIC Δ (δ 13 C rub) and Δ (δ 13 C sac) agree better with changes in simulated δ 13 C DIC Δ (δ 13 C rub) and Δ (δ 13 C sac) suggests that the CIE as measured in laboratory experiments is not directly transferable to the interpretation of marine sediment records. The much smaller CIE-to-glacial–interglacial-signal ratio in foraminifera δ 18 δ 13 δ 18 δ 13 δ 18 O depends on the pH in the surrounding water, suggesting that the CIE should be detectable in neither or both of the isotopes. Whether this lack of role of the CIE in the interpretation of planktic paleo-data is a general feature or is restricted to the two species investigated here needs to be checked with further data from other planktic foraminiferal species.
In:
volume:20
In:
number:4
In:
year:2024
In:
pages:991-1015
In:
extent:25
In:
Climate of the past, Katlenburg-Lindau : Copernicus Ges., 2005-, 20, Heft 4 (2024), 991-1015 (gesamt 25), 1814-9332
Sprache:
Englisch
DOI:
10.5194/cp-20-991-2024
URN:
urn:nbn:de:101:1-2405020441280.159345055302
URL:
https://doi.org/10.5194/cp-20-991-2024
URL:
https://nbn-resolving.org/urn:nbn:de:101:1-2405020441280.159345055302
URL:
https://d-nb.info/1328080323/34
URL:
https://cp.copernicus.org/articles/20/991/2024/cp-20-991-2024.pdf
URL:
https://cp.copernicus.org/articles/20/991/2024/
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