Proceedings of the Symposium on Global and Environmental Monitoring: Proceedings of the Symposium on Global and Environmental Monitoring

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Persistent identifier:: 856665355

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts ; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856665355

Language:: English

Document type:: Multivolume work

Volume

Persistent identifier:: 856669164

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Scope:: XIV, 912 Seiten

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856669164

Illustration:: Illustrationen, Diagramme, Karten

Signature of the source:: ZS 312(28,7,1)

Language:: English

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: International Society for Photogrammetry and Remote Sensing, Commission of Photographic and Remote Sensing Data

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2016

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: [WA-5 WATER RESOURCES]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: DETERMINATION AND SIGNIFICANCE OF SNOW BOUNDARIES ON GLACIERS. Harold Haefner

Document type:: Multivolume work

Structure type:: Chapter

282 DETERMINATION AND SIGNIFICANCE OF SNOW BOUNDARIES ON GLACIERS Harold Haefner Remote Sensing Laboratories, Department of Geography University of Zurich-Irchel Zurich, Switzerland ABSTRACT The seasonal variation of the snow accumulation and melting process in its regional or global context has its tremendeous economical and ecological impacts. It not only affects the run-off pattern and the water balance but as well changes the albedo, which again feedbacks on the radiation budget of the earth and ultimately on the climate. Adequate remote sensing methods have been developed to map and monitor the areal dynamics of the snowcover during the last years. Of specific interest today are the conditions of the snowcover on the surface of glaciers in mountainous regions. Here the accumulation and melting pattern of the snow strongly influences the energy and mass balance of the glaciers and consequently its run-off regime. Alterations of the weather conditions have a direct impact on this process. Or in reverse, by monitoring the melting process it becomes possible to deduce changes of weather, and in the long run of the climate. An extensive and longterm project has been established by the Department of Geography, University of Zurich, to develop the methodology for a careful and accurate monitoring of the various boundaries such as transient snowline, annual snowline, fimline, equlibrium line etc. and the deduction of the two most important glacial indices ELA and AAR. Only a thourough understanding of the glaciological terminology, the use of satellite data from the adequate season and appropriate techniques allow to derive significant, comparable results. The method is based on the establishment of a relationship between the directly detectable boundaries and the equilibrium line as basis for the assessment of the ELA. To monitor the AAR, the total surface of the glacier has to be measured periodically with great accuracy. First results of the project include a detailed study of the migration of the snowlines on the Aletsch Glacier during one melting period, the derivation of the corresponding melting curve, and a comparative assessment of the annual snowline and the ELA on three different glaciers for four successive seasons. KEYWORDS glacier, snowline, fimline, equilibrium line altitude, accumulation area ratio, melting curve, climatic change, high-resolution satellite data

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