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Characteristics of Recent Glacier Variations in Patagonia, Southern Andes

安第斯山脉南部巴塔哥尼亚近期冰川变化特征

基本信息

批准号：
05041049
负责人：
NARUSE Renji
金额：
$ 5.76万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1993
资助国家：
日本
起止时间：
1993 至无数据
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05041049/
关键词：
Patagonia Patagonian Glacier Glacier Variation Thickness Change of Glacier Glacier Flow Heat Balance on Glacier Glacial Landform Ice Radar

项目摘要

Glaciological researches were carried out in November and December 1993, at Upsala, Moreno and Tyndall glaciers in the Southern Patagonia Icefield, southern Andes in South America. Outline of the studies accomplished is as follows :1. Measurements of glacier surface heights were made by a triangulation method in the ablation areas of the above three glaciers. By comparing the data obtained in November-December 1990, it was found that Upsala Glacier has thinned from 30 to 45 m and Tyndall Glacier has thinned from 10 to 15 m during the last three years. Whereas Moreno Glacier has been almost in a steady state.2. Distributions and short-term variations of ice flow velocities were measured at Moreno and Upsala glaciers. Velocities fluctuated from 0.4 to 1.2 cm/hour at a point near the margin of Moreno Glacier. Strain rates of glacier surface were also obtained at Moreno and Tyndall glaciers by a strain grid method.3. An aerial survey around the Northern Patagonia Icefield was accomplished in the end of December 1993. Using the oblique aerial photographs taken, variations of frontal positions of about 20 outlet glaciers are analyzed. Most glaciers have retreated considerably.4. Meteorological parameters and ablation rates of ice were observed on the bare-ice of Moreno and Tyndall glaciers during the periods of 15 days in November and 15 days in December 1993, respectively. Characteristics of meteorological conditions and heat balance are discussed.5. Geomorphological research was carried out in the Ameghino Valley, around the terminus of Upsala Glacier and in the eastern area of Tyndall Glacier. Much information of the recent glacier variations was obtained.

1993年11月和12月在南美洲安第斯山脉南部巴塔哥尼亚冰原的乌普萨拉、莫雷诺和廷德尔冰川进行了冰川学研究。主要完成的研究工作如下：1.在上述三条冰川的消融区，用三角测量法测量了冰川表面高度。通过比较1990年11 - 12月的资料发现，在过去三年中，乌普萨拉冰川从30 m减薄到45 m，廷德尔冰川从10 m减薄到15 m。而莫雷诺冰川几乎处于稳定状态。在莫雷诺和乌普萨拉冰川的冰流速的分布和短期变化进行了测量。在莫雷诺冰川边缘附近的一个点上，速度在0.4到1.2厘米/小时之间波动。采用应变格网法计算了莫雷诺冰川和廷德尔冰川的表面应变率. 1993年12月底完成了对北方巴塔哥尼亚冰原周围的空中调查。利用倾斜航片资料，分析了近20个出口冰川锋面位置的变化。大多数冰川都在不情愿地退缩。在1993年11月和12月分别对莫雷诺冰川和廷德尔冰川的裸冰进行了为期15天的气象参数和消融率观测。讨论了气象条件和热量平衡的特点.地貌研究是在阿梅基诺山谷、乌普萨拉冰川终点周围和廷德尔冰川东部地区进行的。获得了许多有关冰川近期变化的信息。