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切纳布河流域 (1993-2021) 冰川模式的演变:驱动因素和环境影响
Siddhi Garg1, Vibhor Agarwal2, Umesh K Haritashya3
1Department of Geology and Environmental Geosciences, University of Dayton, Dayton, OH 45469, United States of America.
The Science of the total environment
|January 14, 2025
概括
查和克什米尔的冰川正在退缩,但切纳布河流域的一些冰川显示出局部的进展. 碎片覆盖和降水影响这些复杂的冰川动态,而不仅仅是气候变化.
科学领域:
- 冰川学的冰川学
- 气候科学 气候科学
- 喜马拉雅地区的地理
背景情况:
- 查和克什米尔的冰川正在退却的速度比西北部的喜马拉雅山脉要快.
- 一些切纳布河流域冰川表现出周期性的前进和质量增长,与整体退缩趋势形成鲜明对比.
- 局部冰川动态需要进一步的研究,而不仅仅是普遍的气候变化问题.
研究的目的:
- 从1993年到2021年调查切纳布河流域布特和瓦尔万分流域冰川的时空演变.
- 了解影响局部冰川动态的因素,包括前进和撤退.
- 评估冰川面积,厚度,碎片覆盖面和速率的变化.
主要方法:
- 使用从1993年到2021年的遥感数据分析冰川的时空演变.
- 量化面积损失,表面稀薄,碎片覆盖变化和冰川速度.
- 布特和瓦尔万子盆地之间的比较分析.
主要成果:
- 观察到总面积损失为6.7%,表面薄化为-0.3 ± 0.4 ma-1,碎片覆盖增加 (11%),冰川速度降低 (54%在Bhut,20%在Warwan).
- 在九个冰川上发生了定期的,微不足道的冰川推进,其中十二个显示出平衡状态,而113个冰川消失了.
- 与瓦尔万子盆地相比,布特子盆地表现出较高的平均速度,减速和稀薄,受降水和碎片覆盖的影响.
结论:
- 气候驱动着长期和周期性的冰川反应,但空间变化在很大程度上是由碎片厚度控制的.
- 局部的冰川前进并不代表该地区冰川的整体状况或最近的动态.
- 碎片覆盖和降水是影响局部冰川行为和空间变化的关键因素.
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