Spatially variable response of Himalayan glaciers to climate change affected by debris cover

Spatially variable response of Himalayan glaciers to climate change affected by debris cover
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喜马拉雅冰川对受碎片覆盖影响的气候变化的空间变化响应

DOI:
10.1038/ngeo1068
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发表时间:
2011
期刊:
影响因子:
18.3
通讯作者:
Strecker
Strecker
中科院分区:
地球科学1区
文献类型:
--
作者:
Scherler;Bookhagen;Strecker

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政府间气候变化专门委员会第四份报告中的错误声明引发了关于喜马拉雅冰川现状和未来演变的争议。可变的退缩速度,以及缺乏冰川物质平衡数据,使得很难对该地区的区域气候变化影响制定一幅连贯的图景。在这里,我们报告了2000至2008年间大喜马拉雅冰川的遥感锋面变化和表面速度,这些变化为冰川行为与地形和气候有关的强烈空间差异提供了证据。我们观察到的受季风影响的冰川中,超过65%正在消退,但被大量碎片覆盖的冰川和停滞不前的低坡度终点区通常有稳定的锋面。在崎岖的喜马拉雅中部,被碎片覆盖的冰川很常见,但在退缩速度更高的青藏高原上,几乎没有这种冰川。相比之下,在喜马拉雅西北部受西风影响的喀喇昆仑地区,超过50%的观测到的冰川正在前进或保持稳定。我们的研究表明,喜马拉雅冰川对气候变化没有统一的反应,并强调了碎片覆盖对于了解冰川退缩的重要性,到目前为止,在预测未来的水资源可获得性或全球海平面时,这种影响被忽略了。
Controversy about the current state and future evolution of Himalayan glaciers has been stirred up by erroneous statements in the fourth report by the Intergovernmental Panel on Climate Change,. Variable retreat rates,,,and a paucity of glacial mass-balance data,make it difficult to develop a coherent picture of regional climate-change impacts in the region. Here, we report remotely-sensed frontal changes and surface velocities from glaciers in the greater Himalaya between 2000 and 2008 that provide evidence for strong spatial variations in glacier behaviour which are linked to topography and climate. More than 65% of the monsoon-influenced glaciers that we observed are retreating, but heavily debris-covered glaciers with stagnant low-gradient terminus regions typically have stable fronts. Debris-covered glaciers are common in the rugged central Himalaya, but they are almost absent in subdued landscapes on the Tibetan Plateau, where retreat rates are higher. In contrast, more than 50% of observed glaciers in the westerlies-influenced Karakoram region in the northwestern Himalaya are advancing or stable. Our study shows that there is no uniform response of Himalayan glaciers to climate change and highlights the importance of debris cover for understanding glacier retreat, an effect that has so far been neglected in predictions of future water availability,or global sea level.
DOI: 10.1086/621194
发表时间: 1904
期刊: The Journal of Geology
影响因子: --
作者:
I. H. Ogilvie
通讯作者: I. H. Ogilvie
DOI: 10.1126/science.327.5965.522-a
发表时间: 2010-01
期刊: Science
影响因子: 56.9
作者:
J. Cogley;J. Kargel;Georg Kaser;C. J. V. D. Veen
通讯作者: J. Cogley;J. Kargel;Georg Kaser;C. J. V. D. Veen
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DOI: --
发表时间: --
期刊:
影响因子: --
作者:
通讯作者: --
高海拔冰川的当代沉积物产生和转移
DOI: --
发表时间: 2003
期刊:
影响因子: --
作者:
L. Owen;E. Derbyshire;C. Scott
通讯作者: C. Scott
喜马拉雅冰川:冰川研究、冰川退缩和气候变化的最新评论。
DOI: --
发表时间: 2009
期刊:
影响因子: --
作者:
V. K. Raina
通讯作者: V. K. Raina