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| Titel |
The Importance of Oceanic Vertical Mixing on the Glacial-Interglacial Atmospheric Carbondioxide Concentrations |
| VerfasserIn |
Søren Borg Nielsen, Markus Jochum, Carsten Eden, Roman Nuterman |
| 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 |
250149693
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| Publikation (Nr.) |
 EGU/EGU2017-14069.pdf |
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| Zusammenfassung |
| A global Earth System Model with an active ecosystem model is used to investigate the
importance of oceanic vertical mixing on changes in ocean-atmosphere carbon fluxes and
climate due to changes in solar insolation using two setups: one with a fixed vertical
background and enhanced bottom diffusivity in the ocean and one with a numerical scheme
that evaluates vertical diffusion from internal wave energy and stratification. In both setups, a
pre-industrial simulation is compared to one with solar forcing comparable to that 115 kyr
ago. Using a more realistic mixing scheme rather than a fixed background diffusivity
gives rise to changes in the atmospheric CO2 concentration of up to 5 ppm and
causes changes in spatial outgassing patterns as a result of changed solar forcing.
Implications are also found in sea ice extent as well as in ocean circulation with a more
unstable AMOC in the case of an energetically consistent mixing parameterization. |
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