Elevation changes measured on Svalbard glaciers and ice caps from airborne laser data

被引:43
作者
Bamber, Jonathan L.
Krabill, William
Raper, Vivienne
Dowdeswell, Julian A.
Oerlemans, J.
机构
[1] Univ Bristol, Sch Geog Sci, Bristol Glaciol Ctr, Bristol BS8 1SS, Avon, England
[2] NASA, Wallops Fligh Facil, Wallops Isl, VA 23337 USA
[3] Univ Cambridge, Scott Polar Res Inst, Cambridge CB2 1ER, England
[4] Univ Utrecht, Inst Marine & Atmospher Res Utrecht, NL-3584 CC Utrecht, Netherlands
来源
ANNALS OF GLACIOLOGY, VOL 42, 2005 | 2005年 / 42卷
关键词
D O I
10.3189/172756405781813131
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
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 similar to 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 -0.19 ma(-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.
引用
收藏
页码:202 / 208
页数:7
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