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| Titel |
Little Ice Age precipitation in southern Norway |
| VerfasserIn |
L. A. Rasmussen, L. M. Andreassen, S. Baumann |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250022032
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| Zusammenfassung |
| Recently published information on glacier characteristics in southern Norway has
enabled analyzing changes in glacier geometry since the Little Ice Age (LIA) to
estimate the magnitude of the LIA precipitation anomaly. Glacier inventories in the
Jotunheimen region (61.5 N, 8.5 E) were created for (1) 2003 by using a 50-m DEM and
2003 LANDSAT glacier outlines, and for (2) the LIA maximum (about AD 1750)
by using LIA glacier outlines with the DEM. Moraine ridges determined in (2)
were field checked with GPS in summer 2008. Both (1) and (2) provided area and
altitude range, as well as length, slope and aspect. Here 133 glaciers having LIA area
> 0.1 km2 are considered, of which 28 included two or more separate glaciers in
2003.
Area-altitude profiles A(Z) from (1) are transformed to LIA profiles by assuming an
area-increase distribution ΔA(Z) that is concentrated at low altitude and integrates to the
measured area difference between (1) and (2). Because mass balance profiles b(z) in this
region are nearly linear, the average balance B over the area-altitude profile is equal to
the balance at the mean altitude b( |
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