Hovudfagsoppgåve i meteorologi
Peter Schelander
Reconstruction of mass balance on Vatnajökull, Iceland, using a
classification of large-scale circulation.
Abstract:
In this study, an attempt is made
to simulate the mass balance variations on Bruárjökull and
Tungnaàrjökull, which are two outlets of Vatnajökull, Iceland.
First, relations between the large-scale atmospheric circulation
and meteorological parameters above the glacier surface are
established, using a classification to describe the type of
circulation. Daily variations in temperature, precipitation, wind
speed and global radiation has been modeled by use of the
classification and serve as input for an energy balance
model.Summer- and winter balances are simulated and compared with
six years of observations. The result of the summer balance model
are in general in good agreement with observations, and the
winter balance model is able to describe the changes over a few
years.
The derived method was used to reconstruct a net balance record
in the period 1899-1998. The 10-year average agreed well with
general glacier variations in Iceland and it is shown that the
procedure of using a classification of large-scale circulation
yield information about mass changes on Vatnajökull.
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© GFI 18/10/2000