Time-variable ice loss in Asian high mountains from satellite gravimetry
Time-variable ice loss in Asian high mountains from satellite gravimetry
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DOI：
10.1016/j.epsl.2009.11.053
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发表时间：
2010-02
影响因子：
5.3
通讯作者：
K. Matsuo;K. Heki
中科院分区：
文献类型：
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作者：
K. Matsuo;K. Heki
据认为，亚洲高山上的大量冰川正在融化。GRACE卫星在2003-2009年期间的重力测量表明，该地区的平均冰损失率为47± 12 Gigaton（Gt）yr−1，相当于海平面上升0.13±0.04mmyr− 1。这是研究期前2040年平均速度的两倍，与全球冰川消融加速的趋势一致。这样的冰损失率在时间和空间上都有变化;喜马拉雅山的质量损失略有减速，而西北冰川的质量损失则明显加速。印度北方地区地下水的下降以及青藏高原现今隆升速率中近均衡（如构造隆升）和非均衡（如冰川均衡调整）部分所占的比例仍存在不确定性。如果重力增加与持续的冰川均衡调整相关联，部分抵消了负重力趋势，那么校正后的冰损失率可能达到61 Gtyr −1。
Substantial amount of glacial ice is considered to be melting in the Asian high mountains. Gravimetry by GRACE satellite during 2003–2009 suggests the average ice loss rate in this region of 47±12Gigaton (Gt)yr−1, equivalent to ∼0.13±0.04mmyr−1sea level rise. This is twice as fast as the average rate over ∼40years before the studied period, and agrees with the global tendency of accelerating glacial loss. Such ice loss rate varies both in time and space; mass loss in Himalaya is slightly decelerating while those in northwestern glaciers show clear acceleration. Uncertainty still remains in the groundwater decline in northern India, and proportion of almost isostatic (e.g. tectonic uplift) and non-isostatic (e.g. glacial isostatic adjustment) portions in the current uplift rate of the Tibetan Plateau. If gravity increase associated with ongoing glacial isostatic adjustment partially canceled the negative gravity trend, the corrected ice loss rate could reach 61Gtyr−1.