 |
| Titel |
A fully coupled 3-D ice-sheet–sea-level model: algorithm and applications |
| VerfasserIn |
B. de Boer, P. Stocchi, R. S. W. van de Wal |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1991-959X
|
| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 7, no. 5 ; Nr. 7, no. 5 (2014-09-23), S.2141-2156 |
| Datensatznummer |
250115726
|
| Publikation (Nr.) |
 copernicus.org/gmd-7-2141-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| Relative sea-level variations during the late Pleistocene can only be
reconstructed with the knowledge of ice-sheet history. On the other hand, the
knowledge of regional and global relative sea-level variations is necessary
to learn about the changes in ice volume. 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 for the past 410 000 years (410 kyr) from the coupling
of a set of 3-D ice-sheet-shelf models to a global sea-level model, which is
based on the solution of the gravitationally self-consistent sea-level
equation. The sea-level model incorporates the glacial isostatic adjustment
feedbacks for a Maxwell viscoelastic and rotating Earth model with coastal
migration. Ice volume is computed with four 3-D ice-sheet-shelf models for
North America, Eurasia, Greenland and Antarctica. Using an inverse approach,
ice volume and temperature are derived from a benthic δ18O stacked
record. The derived surface-air temperature anomaly is added to the
present-day climatology to simulate glacial–interglacial changes in
temperature and hence ice volume. The ice-sheet thickness variations are then
forwarded to the sea-level model to compute the bedrock deformation, the
change in sea-surface height and thus the relative sea-level change. The
latter is then forwarded to the ice-sheet models. To quantify the impact of
relative sea-level variations on ice-volume evolution, we have performed
coupled and uncoupled simulations. The largest differences of ice-sheet
thickness change occur at the edges of the ice sheets, where relative sea-level
change significantly departs from the ocean-averaged sea-level variations. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|