Consistent interannual changes in glacier mass balance and their relationship with climate variation on the periphery of the Tibetan Plateau
Consistent interannual changes in glacier mass balance and their relationship with climate variation on the periphery of the Tibetan Plateau
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DOI：
10.1093/gji/ggy164
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发表时间：
2018-07
影响因子：
2.8
通讯作者：
Qiuyu Wang;S. Yi;Wenke Sun
中科院分区：
文献类型：
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作者：
Qiuyu Wang;S. Yi;Wenke Sun
关于青藏高原冰川物质平衡的不同观测仍然相互矛盾。结合卫星重力数据和激光测高，我们估计一致的年际变化的冰川质量在念青唐古拉（NT），喜马拉雅山（HM）和帕米尔喀喇昆仑山（PK）的范围。每个子区域的质量预算及其标准差误差。在2003-2008年期间，NT、HM和PK的总量根据卫星重力计算为-23 ± 5 Gt/年，根据激光测高计算为-20 ± 6 Gt/年。在较长的时间跨度内（2003-2015年），冰川质量损失率向西北方向下降，NT、HM和PK的值分别为−0.89 ± 0.15、−0.78 ± 0.11和−0.11 ± 0.05 mwe yr−1（米水当量变化）。然而，在较短的时间间隔内，也有积累期。例如，PK冰川在2003-2005年和2009-2011年增加了质量，主要是由于高降水量。HM和NT的冰川质量损失比PK更严重，特别是在2009年和2012年。也许，由于其独特的冰川积累制度，只有当低温和高降水发生在同一年的冰川在HM和NT增加质量，甚至停止失去质量。这些年际波动和加速损失的PK和HM冰川表明，质量的变化并不能很好地描述单独的速率。
Different observations regarding glacier mass balance on the Tibetan Plateau remain at odds with one another. Combining satellite gravity data with laser altimetry, we estimated consistent interannual changes in glacier mass in the Nyenchen Tanglha (NT), Himalaya (HM) and Pamir–Karakoram (PK) ranges. Reconciled mass budgets and their one standard deviation errors are presented for each subregion. The total for NT, HM and PK is −23 ± 5 Gt yr−1based on satellite gravity and −20 ± 6 Gt yr−1based on laser altimetry over the period 2003–2008. Over a longer temporal span (2003–2015), the rates of glacier mass loss decreased towards the northwest, with values of −0.89 ± 0.15, −0.78 ± 0.11 and −0.11 ± 0.05 mwe yr−1(metre water-equivalent change) for the NT, HM and PK, respectively. However, at shorter time intervals there have also been periods of accumulation. For example, the PK glaciers gained mass over 2003–2005 and 2009–2011, mainly owing to high precipitation. Glaciers in the HM and NT had more severe mass losses than those in the PK, especially in 2009 and 2012. Owing, perhaps, to their unique glacier accumulation regimes, only if low temperature and high precipitation occur in the same year do glaciers in the HM and NT gain mass or even stop losing mass. These interannual fluctuations and accelerating losses in the PK and HM glaciers suggest that mass changes are not well described by rate alone.