Reconstruction of post-little ice age glacier recession in the Lahaul Himalaya, north-west India

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Sanjay Deswal, M. Sharma, Rakesh Saini, P. Chand, Satya Prakash, Pawan Kumar, I. Barr, Syed Umer Latief, Padma Dalal, I. M. Bahuguna
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引用次数: 1

Abstract

ABSTRACT Understanding past glaciation and deglaciation is vital for assessing present-day glacier dynamics and response to climate change. We focus on reconstructing past glacier fluctuations in Lahaul, north-west India, a region located between arid Ladakh and the humid the Pir-Panjal range. We focus specifically on six glaciers in the Miyar and Thirot catchments of varying size, aspect and debris cover. To reconstruct past terminus fluctuations of these glaciers, we used repeat terrestrial photography and historical archives as data sets and mapped the terminus positions and latero-terminal moraines in the field along with glacier terminus mapping from high to medium resolution satellite images (e.g. Corona, Hexagon, Landsat and LISS IV). Results show that since the little ice age, all the studied glaciers have experienced terminus retreat and area loss, with average values of 1.46 and 0.9 km2, respectively. Precipitation data show a statistically significant decreasing trend during the last century with an increasing trend in annual average maximum (T max) and minimum (T min) temperature. This warming trend is more statistically significant for T min. Although total ice loss at the six studied glaciers is considerable (5.48 km2), this varies both spatially (i.e. from glacier to glacier) and temporally. We attribute this variability to topographic controls such as glacier hypsometry and another non-climatic factor, i.e. varying degree of debris cover.
印度西北部拉哈尔喜马拉雅地区小冰期后冰川消退的重建
了解过去的冰川作用和消冰作用对于评估当今冰川动态和对气候变化的响应至关重要。我们专注于重建印度西北部拉哈尔地区过去的冰川波动,该地区位于干旱的拉达克和潮湿的皮尔-潘加尔山脉之间。我们特别关注了宫亚尔和希罗特流域的六个冰川,它们的大小、外观和碎屑覆盖范围各不相同。为了重建这些冰川过去的终端波动,我们利用重复地面摄影和历史档案作为数据集,在野外绘制了终端位置和后终端冰碛,并利用高分辨率到中分辨率卫星图像(如Corona、Hexagon、Landsat和LISS IV)绘制了冰川终端。结果表明,自小冰期以来,所有研究的冰川都经历了终端退缩和面积损失。平均值分别为1.46和0.9 km2。近一个世纪降水资料呈现显著的减少趋势,年平均最高(max)和最低(min)温度呈上升趋势。这一变暖趋势在统计上更为显著。尽管所研究的6个冰川的总冰损失量相当大(5.48 km2),但这在空间上(即冰川与冰川之间)和时间上都存在差异。我们将这种变化归因于地形控制,如冰川低度分布和另一个非气候因素,即不同程度的碎片覆盖。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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