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| Titel |
Climate of the Greenland ice sheet using a high-resolution climate model – Part 1: Evaluation |
| VerfasserIn |
J. Ettema, M. R. Broeke, E. Meijgaard, W. J. Berg, J. E. Box, K. Steffen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 4, no. 4 ; Nr. 4, no. 4 (2010-12-01), S.511-527 |
| Datensatznummer |
250001901
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| Publikation (Nr.) |
 copernicus.org/tc-4-511-2010.pdf |
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| Zusammenfassung |
| A simulation of 51 years (1957–2008) has been performed over Greenland using
the regional atmospheric climate model (RACMO2/GR) at a horizontal grid
spacing of 11 km and forced by ECMWF re-analysis products. To better
represent processes affecting ice sheet surface mass balance, such as
meltwater refreezing and penetration, an additional snow/ice surface module
has been developed and implemented into the surface part of the climate
model. The temporal evolution and climatology of the model is evaluated with
in situ coastal and ice sheet atmospheric measurements of near-surface
variables and surface energy balance components. The bias for the
near-surface air temperature (−0.8 °C), specific humidity
(0.1 g kg−1), wind speed (0.3 m s−1) as well as for radiative (2.5 W m−2
for net radiation) and turbulent heat fluxes shows that the model is in good
accordance with available observations on and around the ice sheet. The
modelled surface energy budget underestimates the downward longwave radiation
and overestimates the sensible heat flux. Due to their compensating effect,
the averaged 2 m temperature bias is small and the katabatic wind
circulation well captured by the model. |
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