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- W4220797903 abstract "<p>The <sup>13</sup>C/<sup>12</sup>C of dissolved inorganic carbon (&#948;<sup>13</sup>C DIC ) carries valuable information on ocean<br>biological C-cycling, air-sea CO<sub>2</sub> exchange, and circulation. Paleo-reconstructions of oceanic <sup>13</sup>C<br>from sediment cores provide key insights into past as changes in these three drivers. As a step<br>toward full inclusion of <sup>13</sup>C in the next generation of Earth system models, we implemented <sup>13</sup>C-<br>cycling in a 1&#176; lateral resolution ocean-ice-biogeochemistry Geophysical Fluid Dynamics<br>Laboratory (GFDL) model driven by Common Ocean Reference Experiment perpetual year<br>forcing. The model improved the mean of modern &#948;<sup>13</sup>C DIC over coarser resolution GFDL-model<br>implementations, capturing the Southern Ocean decline in surface &#948;<sup>13</sup>C DIC that propagates to the<br>deep sea via deep water formation. The model is used here to quantify controls on modern and<br>anthropogenic &#948;<sup>13</sup>C DIC as well as to test their sensitivity to wind speed/gas exchange<br>parameterizations.<br>We found that reducing the coefficient for air-sea gas exchange following OMIP-CMIP6<br>protocols reduces deep sea modern &#948;<sup>13</sup>C DIC by 0.2 permil and improves the depth-integrated<br>anthropogenic &#948;<sup>13</sup>C DIC relative to previous gas exchange parameterizations. This is because the<br>&#948;<sup>13</sup>C DIC of the endmembers ventilating the deep sea and intermediate waters are highly sensitive to<br>the wind speed dependence of the air-sea CO<sub>2</sub> gas exchange. Additionally, meridional gradients<br>of surface modern &#948;<sup>13</sup>C DIC are better resolved with OMIP-CMIP6. While this model was initially<br>constructed to study the anthropogenic <sup>13</sup>C response, it has promising applications toward longer<br>time scales. For example, BLING 13 C includes controls on the biological C-pump thought to be<br>important in the glacial ocean: light and iron limitation, and controls on <sup>13</sup>C of organic matter<br>formation, and thus on ocean &#948;<sup>13</sup>C DIC and its vertical gradient, that depend on pCO<sub>2</sub> .</p>" @default.
- W4220797903 created "2022-04-03" @default.
- W4220797903 creator A5059602338 @default.
- W4220797903 creator A5076668750 @default.
- W4220797903 date "2022-03-28" @default.
- W4220797903 modified "2023-09-24" @default.
- W4220797903 title "A Next Generation Ocean Carbon Isotope Model for Climate Studies" @default.
- W4220797903 doi "https://doi.org/10.5194/egusphere-egu22-8892" @default.
- W4220797903 hasPublicationYear "2022" @default.
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