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| Titel |
Simulating radiocarbon in the ocean model of the FAMOUS GCM |
| VerfasserIn |
Jennifer Dentith, Ruza Ivanovic, Lauren Gregoire, Julia Tindall, Laura F. Robinson |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250143157
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| Publikation (Nr.) |
 EGU/EGU2017-6857.pdf |
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| Zusammenfassung |
| Carbon isotopes are often utilised as proxies for palaeoceanographic circulation. However,
discrepancies exist in the interpretation of isotopes in geological archives. A powerful
approach for improving our understanding of palaeodata is to directly simulate multiple
isotopic tracer fields within complex numerical models, thereby enabling model output to be
compared directly to observations rather than the more uncertain climatic interpretations.
We added the radioactive isotope 14C to the ocean component of the FAMOUS
atmosphere-ocean General Circulation Model to examine ocean circulation, the oceanic
carbon cycle, and air-sea gas exchange. The abiotic 14C tracer field is calculated based
on air-sea gas exchange, advection and radioactive decay. A 10,000 year spin-up
simulation was run to allow 14C concentrations in the deep ocean to equilibrate. Here,
we compare the modelled 14C distributions in both the pre- and post-bomb era to
published 14C compilations. We also discuss methods for overcoming model drifts
in the marine hydrological cycle and their impact on deep ocean circulation. The
overall aim is to use the isotope-enabled model to investigate the 14C fingerprint of
different states of overturning circulation and to reach a better understanding of
changes in ocean circulation and the carbon cycle at the Last Glacial Maximum
(21,000 years ago) and during the last deglaciation (21,000-11,000 years ago). |
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