Recent thinning, retreat and flow of Upsala Glacier, Patagonia
Recent thinning, retreat and flow of Upsala Glacier, Patagonia
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巴塔哥尼亚乌普萨拉冰川近期变薄、后退和流动
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
C. Juan
中科院分区：
文献类型：
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作者：
P. Skvarca;K. Satow;R. Naruse;C. Juan
1993年11月下旬，重新测量了巴塔哥尼亚南部Upsala冰川的表面高程，沿距现在冰川前缘约1公里的横向剖面进行了测量。重复的大地测量表明，1990-1993年期间，冰川平均下降了33m，即平均减薄速度为11m/a。现场还测量了冰川末端的位置，该冰川末端崩解进入阿根廷拉戈岛的西臂(Brao Upsala)。与1990年的情况相比，除西部边缘几乎保持不变外，大约有1200米(400米/年)的较大后退。这表明，1981年开始的撤退速度最近有所加快。11月22日至28日，在每小时和每天的时间间隔上，沿着大致相同的横向剖面测量了地表冰流速度。冰川东缘附近的流速为1.56m/d，向冰川中心线方向增加到4.44m/d。在不同的时间间隔内，没有观察到明显的速度变化。在6天内测量的7个点的消融率的平均值为5.8厘米/天。
In late November 1993, the surface elevation of Upsala Glacier, southern Patagonia, was remeasured along a transverse profile located about 1 km from the present glacier front. Repeated geodetic measurements show a significant average surface lowering of 33 m during the period 1990-93, namely a mean thinning rate of 11 m/a. The position of the glacier terminus, calving into the western arm (Brazo Upsala) of Lago Argentino, was also surveyed in the field. The comparison with the position in 1990 indicates a large recession of around 1200 m (400 m/a), except at the western margin that remained almost stationary. This shows a recent accelerated rate of the retreat initiated in 1981. Between November 22 and 28, surface ice flow velocities were measured along approximately the same transverse profile at hourly and daily time intervals. Velocities ranged from 1.56 m/day near the east margin, increasing to 4.44 m/day towards the glacier center line. No significant changes in velocities were observed for the different time intervals. Ablation rates measured during the six days at seven points yielded a mean value of 5.8 cm/day.