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| Titel |
Melting trends over the Greenland ice sheet (1958–2009) from spaceborne microwave data and regional climate models |
| VerfasserIn |
X. Fettweis, M. Tedesco, M. Broeke, J. Ettema |
| 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 ; 5, no. 2 ; Nr. 5, no. 2 (2011-05-05), S.359-375 |
| Datensatznummer |
250002429
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| Publikation (Nr.) |
 copernicus.org/tc-5-359-2011.pdf |
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| Zusammenfassung |
| To study near-surface melt changes over the Greenland ice sheet (GrIS) since
1979, melt extent estimates from two regional climate models were compared
with those obtained from spaceborne microwave brightness temperatures using
two different remote sensing algorithms. The results from the two models were
consistent with those obtained with the remote sensing algorithms at both
daily and yearly time scales, encouraging the use of the models for analyzing
melting trends before the satellite era (1958–1979), when forcing
data is available. Differences between satellite-derived and model-simulated
results still occur and are used here to identify (i) biases in the snow
models (notably in the albedo parametrization, in the thickness of a snow
layer, in the maximum liquid water content within the snowpack and in the
snowfall impacting the bare ice appearance in summer) and (ii) limitations in
the use of passive microwave data for snowmelt detection at the edge of the
ice sheet due to mixed pixel effect (e.g., tundra or rock nearby the ice
sheet). The results from models and spaceborne microwave sensors confirm a
significant (p-value = 0.01) increase in GrIS surface melting since 1979.
The melt extent recorded over the last years (1998, 2003, 2005 and 2007) is
unprecedented in the last 50 yr with the cumulated melt area in the 2000's
being, on the average, twice that of the 1980's. |
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