Simulating stable carbon isotopes in the ocean component of the FAMOUS general circulation model with MOSES1 (XOAVI)
<p>Ocean circulation and the marine carbon cycle can be indirectly inferred from stable and radiogenic carbon isotope ratios (<span class="inline-formula"><i>δ</i><sup>13</sup>C</span> and <span class="inline-formula">Δ<sup>14...
Main Authors: | , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Copernicus Publications
2020-08-01
|
Series: | Geoscientific Model Development |
Online Access: | https://gmd.copernicus.org/articles/13/3529/2020/gmd-13-3529-2020.pdf |
id |
doaj-a44299e19c7949e69eb5d7b0d0c92ef3 |
---|---|
record_format |
Article |
spelling |
doaj-a44299e19c7949e69eb5d7b0d0c92ef32020-11-25T03:04:29ZengCopernicus PublicationsGeoscientific Model Development1991-959X1991-96032020-08-01133529355210.5194/gmd-13-3529-2020Simulating stable carbon isotopes in the ocean component of the FAMOUS general circulation model with MOSES1 (XOAVI)J. E. Dentith0R. F. Ivanovic1L. J. Gregoire2J. C. Tindall3L. F. Robinson4School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UKSchool of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UKSchool of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UKSchool of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UKSchool of Earth Sciences, University of Bristol, Bristol, BS8 1RJ, UK<p>Ocean circulation and the marine carbon cycle can be indirectly inferred from stable and radiogenic carbon isotope ratios (<span class="inline-formula"><i>δ</i><sup>13</sup>C</span> and <span class="inline-formula">Δ<sup>14</sup>C</span>, respectively), measured directly in the water column, or recorded in geological archives such as sedimentary microfossils and corals. However, interpreting these records is non-trivial because they reflect a complex interplay between physical and biogeochemical processes. By directly simulating multiple isotopic tracer fields within numerical models, we can improve our understanding of the processes that control large-scale isotope distributions and interpolate the spatiotemporal gaps in both modern and palaeo datasets. We have added the stable isotope <span class="inline-formula"><sup>13</sup>C</span> to the ocean component of the FAMOUS coupled atmosphere–ocean general circulation model, which is a valuable tool for simulating complex feedbacks between different Earth system processes on decadal to multi-millennial timescales. We tested three different biological fractionation parameterisations to account for the uncertainty associated with equilibrium fractionation during photosynthesis and used sensitivity experiments to quantify the effects of fractionation during air–sea gas exchange and primary productivity on the simulated <span class="inline-formula"><i>δ</i><sup>13</sup>C<sub>DIC</sub></span> distributions. Following a 10 000-year pre-industrial spin-up, we simulated the Suess effect (the isotopic imprint of anthropogenic fossil fuel burning) to assess the performance of the model in replicating modern observations. Our implementation captures the large-scale structure and range of <span class="inline-formula"><i>δ</i><sup>13</sup>C<sub>DIC</sub></span> observations in the surface ocean, but the simulated values are too high at all depths, which we infer is due to biases in the biological pump. In the first instance, the new <span class="inline-formula"><sup>13</sup>C</span> tracer will therefore be useful for recalibrating both the physical and biogeochemical components of FAMOUS.</p>https://gmd.copernicus.org/articles/13/3529/2020/gmd-13-3529-2020.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
J. E. Dentith R. F. Ivanovic L. J. Gregoire J. C. Tindall L. F. Robinson |
spellingShingle |
J. E. Dentith R. F. Ivanovic L. J. Gregoire J. C. Tindall L. F. Robinson Simulating stable carbon isotopes in the ocean component of the FAMOUS general circulation model with MOSES1 (XOAVI) Geoscientific Model Development |
author_facet |
J. E. Dentith R. F. Ivanovic L. J. Gregoire J. C. Tindall L. F. Robinson |
author_sort |
J. E. Dentith |
title |
Simulating stable carbon isotopes in the ocean component of the FAMOUS general circulation model with MOSES1 (XOAVI) |
title_short |
Simulating stable carbon isotopes in the ocean component of the FAMOUS general circulation model with MOSES1 (XOAVI) |
title_full |
Simulating stable carbon isotopes in the ocean component of the FAMOUS general circulation model with MOSES1 (XOAVI) |
title_fullStr |
Simulating stable carbon isotopes in the ocean component of the FAMOUS general circulation model with MOSES1 (XOAVI) |
title_full_unstemmed |
Simulating stable carbon isotopes in the ocean component of the FAMOUS general circulation model with MOSES1 (XOAVI) |
title_sort |
simulating stable carbon isotopes in the ocean component of the famous general circulation model with moses1 (xoavi) |
publisher |
Copernicus Publications |
series |
Geoscientific Model Development |
issn |
1991-959X 1991-9603 |
publishDate |
2020-08-01 |
description |
<p>Ocean circulation and the marine carbon cycle can be
indirectly inferred from stable and radiogenic carbon isotope ratios
(<span class="inline-formula"><i>δ</i><sup>13</sup>C</span> and <span class="inline-formula">Δ<sup>14</sup>C</span>, respectively), measured directly
in the water column, or recorded in geological archives such as sedimentary
microfossils and corals. However, interpreting these records is non-trivial
because they reflect a complex interplay between physical and biogeochemical
processes. By directly simulating multiple isotopic tracer fields within
numerical models, we can improve our understanding of the processes that
control large-scale isotope distributions and interpolate the spatiotemporal
gaps in both modern and palaeo datasets. We have added the stable isotope
<span class="inline-formula"><sup>13</sup>C</span> to the ocean component of the FAMOUS coupled atmosphere–ocean
general circulation model, which is a valuable tool for simulating complex
feedbacks between different Earth system processes on decadal to
multi-millennial timescales. We tested three different biological
fractionation parameterisations to account for the uncertainty associated
with equilibrium fractionation during photosynthesis and used sensitivity
experiments to quantify the effects of fractionation during air–sea gas
exchange and primary productivity on the simulated <span class="inline-formula"><i>δ</i><sup>13</sup>C<sub>DIC</sub></span>
distributions. Following a 10 000-year pre-industrial spin-up, we simulated
the Suess effect (the isotopic imprint of anthropogenic fossil fuel burning)
to assess the performance of the model in replicating modern observations.
Our implementation captures the large-scale structure and range of <span class="inline-formula"><i>δ</i><sup>13</sup>C<sub>DIC</sub></span> observations in the surface ocean, but the simulated
values are too high at all depths, which we infer is due to biases in the
biological pump. In the first instance, the new <span class="inline-formula"><sup>13</sup>C</span> tracer will
therefore be useful for recalibrating both the physical and biogeochemical
components of FAMOUS.</p> |
url |
https://gmd.copernicus.org/articles/13/3529/2020/gmd-13-3529-2020.pdf |
work_keys_str_mv |
AT jedentith simulatingstablecarbonisotopesintheoceancomponentofthefamousgeneralcirculationmodelwithmoses1xoavi AT rfivanovic simulatingstablecarbonisotopesintheoceancomponentofthefamousgeneralcirculationmodelwithmoses1xoavi AT ljgregoire simulatingstablecarbonisotopesintheoceancomponentofthefamousgeneralcirculationmodelwithmoses1xoavi AT jctindall simulatingstablecarbonisotopesintheoceancomponentofthefamousgeneralcirculationmodelwithmoses1xoavi AT lfrobinson simulatingstablecarbonisotopesintheoceancomponentofthefamousgeneralcirculationmodelwithmoses1xoavi |
_version_ |
1724681478545080320 |