Deglacial carbon cycle changes observed in a compilation of 127 benthic <i>δ</i><sup>13</sup>C time series (20–6 ka)
<p>We present a compilation of 127 time series <i>δ</i><sup>13</sup>C records from <i>Cibicides wuellerstorfi</i> spanning the last deglaciation (20–6 ka) which is well-suited for reconstructing large-scale carbon cycle changes, especially for...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2018-08-01
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| Series: | Climate of the Past |
| Online Access: | https://www.clim-past.net/14/1229/2018/cp-14-1229-2018.pdf |
| Summary: | <p>We present a compilation of 127 time series <i>δ</i><sup>13</sup>C records from
<i>Cibicides wuellerstorfi</i> spanning the last deglaciation
(20–6 ka) which is
well-suited for reconstructing large-scale carbon cycle changes, especially
for comparison with isotope-enabled carbon cycle models. The age models for
the <i>δ</i><sup>13</sup>C records are derived from regional planktic
radiocarbon compilations (Stern and Lisiecki 2014). The
<i>δ</i><sup>13</sup>C records were stacked in nine different regions and then
combined using volume-weighted averages to create intermediate, deep, and
global <i>δ</i><sup>13</sup>C stacks. These benthic <i>δ</i><sup>13</sup>C stacks
are used to reconstruct changes in the size of the terrestrial biosphere and
deep ocean carbon storage. The timing of change in global mean
<i>δ</i><sup>13</sup>C is interpreted to indicate terrestrial biosphere
expansion from 19–6 ka. The <i>δ</i><sup>13</sup>C gradient between the
intermediate and deep ocean, which we interpret as a proxy for deep ocean
carbon storage, matches the pattern of atmospheric CO<sub>2</sub> change
observed in ice core records. The presence of signals associated with the
terrestrial biosphere and atmospheric CO<sub>2</sub> indicates that the compiled
<i>δ</i><sup>13</sup>C records have sufficient spatial coverage and time
resolution to accurately reconstruct large-scale carbon cycle changes during
the glacial termination.</p> |
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| ISSN: | 1814-9324 1814-9332 |