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style="font-size:14.0pt;font-family:Times;
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Roman";mso-bidi-font-family:"Times New Roman""
lang="EN-US">"Moving beyond the age-depth paradigm in deep sea
palaeoclimate archives using single foram <sup>14</sup>C
dating".</span></p>
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style="font-size:14.0pt;font-family:Times;
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Roman";mso-bidi-font-family:"Times New Roman""
lang="EN-US">Bryan Lougheed, Uppsala University</span></p>
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style="font-size:14.0pt;font-family:Times;mso-fareast-font-family:
"Times New Roman";mso-bidi-font-family:"Times New
Roman";mso-ansi-language: EN-GB">IGV, William-Olssonsalen,
Tuesday, September 19, 12.15-13.00</span></p>
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<p><span style="font-size:14.0pt">Abstract: </span></p>
<p><span style="font-size:14.0pt;mso-ansi-language:EN-US"
lang="EN-US">Late-glacial paleoclimate reconstructions from
deep-sea sediment archives provide valuable insight into past
rapid changes in ocean chemistry, but only a small proportion of
the ocean floor is suitable for such reconstructions using the
existing state-of-the-art. We employ ultra-small radiocarbon (<sup>14</sup>C)
dating on single microscopic foraminifera to demonstrate that
the longstanding age-depth method conceals large age uncertainty
caused by post-depositional sediment mixing. To overcome these
problems, we use dual <sup>14</sup>C and stable isotope (δ<sup>18</sup>O
and δ<sup>13</sup>C) analysis on single microscopic foraminifera
to produce a paleoclimate time series independent of the
age-depth paradigm. This new method will address large
geographical gaps in late-glacial benthic paleoceanographic
reconstructions by opening up vast areas of previously
disregarded deep-sea archives, leading to improved understanding
of the interaction between oceans and climate.</span><span
style="font-size:14.0pt"></span></p>
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