Elevation changes measured on Svalbard glaciers and ice caps from airborne laser data
Precise airborne laser surveys were conducted during spring in 1996 and 2002 on 17 ice caps and glaciers in the Svalbard archipelago covering the islands of Spitsbergen and Nordaustlandet. We present the derived elevation changes. Lower-elevation glaciers in south Spitsbergen show the largest thinni...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/22699 2023-07-23T04:19:24+02:00 Elevation changes measured on Svalbard glaciers and ice caps from airborne laser data Oerlemans, J. Bamber, J.L. Krabill, W. Raper, V. Dowdeswell, J.A. 2005-08 image/pdf https://dspace.library.uu.nl/handle/1874/22699 en eng 1727-5644 Online 0260-3055 Print https://dspace.library.uu.nl/handle/1874/22699 info:eu-repo/semantics/ClosedAccess Natuur- en Sterrenkunde Article 2005 ftunivutrecht 2023-07-01T23:21:32Z Precise airborne laser surveys were conducted during spring in 1996 and 2002 on 17 ice caps and glaciers in the Svalbard archipelago covering the islands of Spitsbergen and Nordaustlandet. We present the derived elevation changes. Lower-elevation glaciers in south Spitsbergen show the largest thinning rates of ~0.5ma–1, while some of the higher, more northerly ice caps appear to be close to balance. The pattern of elevation change is complex, however, due to several factors including glacier aspect, microclimatological influences and the high natural annual variability in local accumulation and ablation rates. Anomalous changes were observed on Fridtjovbreen, which started surging in 1996, at the start of the measurement period. On this glacier, thinning (of > 0.6ma–1)was observed in the accumulation area, coincident with thickening at lower elevations. Asymmetric thinning was found on two ice caps on Nordaustlandet, with the largest values on the eastern side of Vestfonna but the western slopes of Vegafonna. The mean elevation change for all ice masses was –0.19ma–1 w.e., which is 1.6 times the net mass-balance value determined for the last 30 years. Using mass-balance sensitivity estimates for Svalbard suggests that the implied increase in negative balance is linked to warmer air temperatures in the late 1990s. Multiple linear regression suggests that mass balance is most closely correlated with latitude, rather than mean altitude or longitude. Article in Journal/Newspaper glacier Nordaustlandet Svalbard Vestfonna Spitsbergen Utrecht University Repository Fridtjovbreen ENVELOPE(14.450,14.450,77.830,77.830) Nordaustlandet ENVELOPE(22.400,22.400,79.800,79.800) Svalbard Svalbard Archipelago Vegafonna ENVELOPE(21.201,21.201,79.454,79.454) Vestfonna ENVELOPE(20.761,20.761,79.941,79.941) |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Natuur- en Sterrenkunde |
spellingShingle |
Natuur- en Sterrenkunde Oerlemans, J. Bamber, J.L. Krabill, W. Raper, V. Dowdeswell, J.A. Elevation changes measured on Svalbard glaciers and ice caps from airborne laser data |
topic_facet |
Natuur- en Sterrenkunde |
description |
Precise airborne laser surveys were conducted during spring in 1996 and 2002 on 17 ice caps and glaciers in the Svalbard archipelago covering the islands of Spitsbergen and Nordaustlandet. We present the derived elevation changes. Lower-elevation glaciers in south Spitsbergen show the largest thinning rates of ~0.5ma–1, while some of the higher, more northerly ice caps appear to be close to balance. The pattern of elevation change is complex, however, due to several factors including glacier aspect, microclimatological influences and the high natural annual variability in local accumulation and ablation rates. Anomalous changes were observed on Fridtjovbreen, which started surging in 1996, at the start of the measurement period. On this glacier, thinning (of > 0.6ma–1)was observed in the accumulation area, coincident with thickening at lower elevations. Asymmetric thinning was found on two ice caps on Nordaustlandet, with the largest values on the eastern side of Vestfonna but the western slopes of Vegafonna. The mean elevation change for all ice masses was –0.19ma–1 w.e., which is 1.6 times the net mass-balance value determined for the last 30 years. Using mass-balance sensitivity estimates for Svalbard suggests that the implied increase in negative balance is linked to warmer air temperatures in the late 1990s. Multiple linear regression suggests that mass balance is most closely correlated with latitude, rather than mean altitude or longitude. |
format |
Article in Journal/Newspaper |
author |
Oerlemans, J. Bamber, J.L. Krabill, W. Raper, V. Dowdeswell, J.A. |
author_facet |
Oerlemans, J. Bamber, J.L. Krabill, W. Raper, V. Dowdeswell, J.A. |
author_sort |
Oerlemans, J. |
title |
Elevation changes measured on Svalbard glaciers and ice caps from airborne laser data |
title_short |
Elevation changes measured on Svalbard glaciers and ice caps from airborne laser data |
title_full |
Elevation changes measured on Svalbard glaciers and ice caps from airborne laser data |
title_fullStr |
Elevation changes measured on Svalbard glaciers and ice caps from airborne laser data |
title_full_unstemmed |
Elevation changes measured on Svalbard glaciers and ice caps from airborne laser data |
title_sort |
elevation changes measured on svalbard glaciers and ice caps from airborne laser data |
publishDate |
2005 |
url |
https://dspace.library.uu.nl/handle/1874/22699 |
long_lat |
ENVELOPE(14.450,14.450,77.830,77.830) ENVELOPE(22.400,22.400,79.800,79.800) ENVELOPE(21.201,21.201,79.454,79.454) ENVELOPE(20.761,20.761,79.941,79.941) |
geographic |
Fridtjovbreen Nordaustlandet Svalbard Svalbard Archipelago Vegafonna Vestfonna |
geographic_facet |
Fridtjovbreen Nordaustlandet Svalbard Svalbard Archipelago Vegafonna Vestfonna |
genre |
glacier Nordaustlandet Svalbard Vestfonna Spitsbergen |
genre_facet |
glacier Nordaustlandet Svalbard Vestfonna Spitsbergen |
op_relation |
1727-5644 Online 0260-3055 Print https://dspace.library.uu.nl/handle/1874/22699 |
op_rights |
info:eu-repo/semantics/ClosedAccess |
_version_ |
1772182421940207616 |