首页> 外文期刊>Journal of Glaciology >The influence of debris cover and glacial lakes on the recession of glaciers in Sikkim Himalaya, India
【24h】

The influence of debris cover and glacial lakes on the recession of glaciers in Sikkim Himalaya, India

机译:印度锡金喜马拉雅山的碎片覆盖和冰川湖泊对冰川衰退的影响

获取原文
获取原文并翻译 | 示例
           

摘要

We investigated area changes in glaciers covering an area of ~200 km~2 in the Tista basin, Sikkim, Eastern Indian Himalaya, between ~1990 and 2010 using Landsat Thematic Mapper (TM) and Indian Remote-sensing Satellite (IRS) images and related the changes to debris cover, supraglacial lakes and moraine-dam lakes. The glaciers lost an area of 3.3 ±0.8% between 1989/90 and 2010. More detailed analysis revealed an area loss of 2.00 ±0.82, 2.56 ±0.61 and 2.28 ±2.01 km2 for the periods 1989-97, 1997-2004/05 and 2004-2009/10, respectively. This indicates an accelerated retreat of glaciers after 1997. On further analysis, we observed (1) the formation and expansion of supraglacial lakes on many debris-covered glaciers and (2) the merging of these lakes over time, leading to the development of large moraine-dam lakes. We also observed that debris-covered glaciers with lakes lose a greater area than debris-covered glaciers without lakes and debris-free glaciers. The climatic data for 24 years (1987-2011), measured at the Gangtok meteorological station (1812 ma.s.l.), showed that the region experienced a 1.0℃ rise in the summer minimum temperature and a 2.0℃ rise in the winter minimum temperature, indicating hotter summers and warmer winters. There was no significant trend in the total annual precipitation. We find that glacier retreat is caused mainly by a temperature increase and that debris-covered glaciers can retreat at a faster rate than debris-free glaciers, if associated with lakes.
机译:我们使用Landsat专题测绘仪(TM)和印度遥感卫星(IRS)图像及相关资料,研究了1990年至2010年之间印度东部喜马拉雅山锡金市提斯塔盆地约200 km〜2的冰川面积变化。碎片覆盖,冰川湖和冰ora坝湖的变化。在1989/90年至2010年之间,冰川损失了3.3±0.8%的面积。更详细的分析表明,在1989-97年,1997-2004 / 05和2000年期间,面积损失为2.00±0.82、2.56±0.61和2.28±2.01 km2。 2004-2009 / 10。这表明1997年以后冰川退缩加速。在进一步分析中,我们观察到(1)许多被碎屑覆盖的冰川上冰川湖的形成和扩展,以及(2)随着时间的推移这些湖泊的合并,导致了大型冰川的发展。 ora冰湖。我们还观察到,有湖泊的残骸覆盖的冰川比没有湖泊和无残骸冰川的残骸覆盖的冰川损失更大。在甘托克气象站(1812 ma.sl)测得的24年(1987-2011)气候数据显示,该地区夏季最低温度上升了1.0℃,冬季最低温度上升了2.0℃,表示夏天炎热,冬天温暖。年降水量没有明显趋势。我们发现,冰川退缩主要是由温度升高引起的,如果与湖泊相关联,被残骸覆盖的冰川的退缩速度将比无碎片冰川退缩的速度更快。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号