 |
| Titel |
The effect of climate forcing on numerical simulations of the Cordilleran ice sheet at the Last Glacial Maximum |
| VerfasserIn |
J. Seguinot, C. Khroulev, I. Rogozhina, A. P. Stroeven, Q. Zhang |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1994-0416
|
| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 8, no. 3 ; Nr. 8, no. 3 (2014-06-23), S.1087-1103 |
| Datensatznummer |
250116168
|
| Publikation (Nr.) |
 copernicus.org/tc-8-1087-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| We present an ensemble of numerical simulations of the Cordilleran ice sheet
during the Last Glacial Maximum performed with the Parallel Ice Sheet Model
(PISM), applying temperature offsets to the present-day climatologies from
five different data sets. Monthly mean surface air temperature and
precipitation from WorldClim, the NCEP/NCAR reanalysis, the ERA-Interim
reanalysis, the Climate Forecast System Reanalysis and the North American
Regional Reanalysis are used to compute surface mass balance in a positive
degree-day model. Modelled ice sheet outlines and volumes appear highly
sensitive to the choice of climate forcing. For three of the four reanalysis
data sets used, differences in precipitation are the major source for
discrepancies between model results. We assess model performance against
a geomorphological reconstruction of the ice margin at the Last Glacial
Maximum, and suggest that part of the mismatch is due to unresolved
orographic precipitation effects caused by the coarse resolution of
reanalysis data. The best match between model output and the reconstructed
ice margin is obtained using the high-resolution North American Regional
Reanalysis, which we retain for simulations of the Cordilleran ice sheet in
the future. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|