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Glacier Area and Length Changes in Norway from Repeat Inventories : Volume 8, Issue 3 (10/06/2014)

By Winsvold, S. H.

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Book Id: WPLBN0004023040
Format Type: PDF Article :
File Size: Pages 47
Reproduction Date: 2015

Title: Glacier Area and Length Changes in Norway from Repeat Inventories : Volume 8, Issue 3 (10/06/2014)  
Author: Winsvold, S. H.
Volume: Vol. 8, Issue 3
Language: English
Subject: Science, Cryosphere, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Andreassen, L. M., Kienholz, C., & Winsvold, S. H. (2014). Glacier Area and Length Changes in Norway from Repeat Inventories : Volume 8, Issue 3 (10/06/2014). Retrieved from http://www.ebooklibrary.org/


Description
Description: Department of Geosciences, University of Oslo, P.O. Box 1047 Blindern, 0316 Oslo, Norway. In this study, we assess glacier area and length changes in mainland Norway from repeat Landsat TM/ETM+ derived inventories and digitized topographic maps. The multi-temporal glacier inventory consists of glacier outlines from within three time ranges: 1947 to 1985 (GIn50), 1988 to 1997 (GI1990), and 1999 to 2006 (GI2000). For the northernmost regions, we include an additional inventory (GI1900), based on historic maps surveyed between 1895 to 1907. Area and length changes are assessed per glacier unit, for 36 subregions, and for three main parts of Norway: southern, central and northern Norway. The results show a decrease of the glacierized area from 2994 km2 in GIn50, to 2668 km2 in GI2000 (totally 2722 glacier units), corresponding to an area reduction of −326 km2, or −11% of the initial GIn50 area. This is equivalent to an average change rate of −11 km2 a−1 over the past 30 years. The average length change for the full epoch (within GIn50 and GI2000) is −240 m, corresponding to an average length change rate of −8 m a−1. Overall, the comparison reveals both area and length reduction as a general pattern, even though some glaciers have advanced. The three northernmost glacier regions show the strongest retreat rates, whereas the central part of Norway shows the lowest change rates. Glacier area and length changes indicate that glaciers in maritime areas in southern Norway have retreated more than glaciers in the interior, and glaciers in the north have retreated more than southern glaciers. These observed spatial trends in glacier change are related to a combination of several geographical factors like glacier geometry and elevation, and other climatic aspects, such as continentality and the North Atlantic Oscillation.

Summary
Glacier area and length changes in Norway from repeat inventories

Excerpt
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