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| Titel |
Simulating regionally varying sea-level changes over the past glacial cycles with a coupled ice-sheet sea-level model |
| VerfasserIn |
Bas De Boer, Paolo Stocchi, Roderik van de Wal |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250083170
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| Zusammenfassung |
| Relative Sea Level (RSL) variations during the late Pleistocene cannot be reconstructed
regardless of the estimates of ice-sheets volume fluctuations. For the latter, however, the
knowledge of regional and global RSL variations is necessary. Overcoming this problem of
circularity demands a fully coupled system where ice sheets and sea level vary consistently in
space and time and dynamically affect each other. Here we present results over the past
500,000 years from the coupling of a set of 3-D ice-sheet-shelf models to a global sea-level
model based on the gravitationally self-consistent Sea Level Equation (SLE) and
incorporating feedbacks from Earth rotation and coastlines variations. Ice volume is
computed with four 3-D ice-sheet-shelf models for North America, Eurasia, Greenland and
Antarctica. With an inverse approach ice volume and temperature are derived from a benthic
δ18O stacked record. The ice-sheets thickness variations are then provided into the
SLE model to compute the bedrock deformations, the mean sea surface and the
RSL changes for the next time-step. To quantify the impact of RSL variations on
ice-volume evolution, we have performed coupled and uncoupled simulations. The largest
differences of ice-volume change are observed close the edges of the ice sheets,
where RSL significantly differs from the global averaged sea level. Moreover, we
have compared our simulated regional sea level with local reconstructions from
observational RSL data, showing a good comparison for several records over the globe. |
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