Abstract (eng)
The empirical link between time series of large scale atmospheric patterns (temperature, humidity and sea level pressure) and local scale glacier mass balances (that consider mass gain as well as mass loss on a yearly base) is investigated. Grounded on this link mass balance scenarios until the end of this century are derived. This is done for five Austrian glaciers: Jamtalferner, Hintereisferner, Vernagtferner, Goldbergkees and Wurtenkees.
First, the main information of the global atmospheric fields is extracted by the application of an empirical orthogonal function analysis. Then a statistical relationship between the mass balance time series and the analysed climate parameters is established and validated. Under the assumption that relationship which is reliable for the past is also valid for the future, mass balance scenarios until 2100 are projected. Therefore the emission scenarios A1B and B1 (the first scenario appears realistic regarding the trend so far whilst the latter one describes a ecological friendly development of mankind that involves the preference of ecological welfare over individualism), realized with the global circulation model ECHAM5-MPIOM, are used. Results show negative trends for all winter as well as for all summer mass balances. According to that glaciers will gain less mass in winter and lose more during summer. As such they will continue to retreat till the end of this century.
The diploma thesis is made up by 5 chapters. First, glacier mass balance measurements and research carried out so far is discussed. Then the used climate models and the glaciers considered are described. This is followed by a discussion of the applied statistical methods used and following by the achieved results. Finally some ideas how this line of research may be continued further are suggested.