Geodetic glacier mass balance (1975−1999) in the central Pamir using the SRTM DEM and KH-9 imagery
Geodetic glacier mass balance (1975−1999) in the central Pamir using the SRTM DEM and KH-9 imagery
复制标题
使用 SRTM DEM 和 KH-9 图像在帕米尔高原中部进行大地冰川质量平衡（1975 年至 1999 年）
DOI：
10.1017/jog.2019.8
复制
发表时间：
2019
影响因子：
3.4
通讯作者：
Ding Xiaoli
中科院分区：
文献类型：
--
作者：
Zhou Yushan;Li Zhiwei;Li Jia;Zhao Rong;Ding Xiaoli
利用大地测量法对帕米尔山脉的区域冰川物质平衡进行了多项研究，但很少扩展到2000年前。在本研究中，我们利用1975年获取的KH-9影像生成帕米尔中部的历史DEM，然后将其与SRTM C波段DEM进行比较，得到冰川高程变化。C波段雷达对不同冰川表面的穿透深度进行了校正，即积雪/积雪、裸露冰层和碎片覆盖区域的穿透深度分别为2.96、1.68和0米。最终结果表明，帕米尔中部冰川总体上经历了−0.03±0.24mW.E的近零质量平衡。1975年至1999年的−1。由于冰川涌动活动，各冰川的海拔变化模式变化很大，其物质平衡在−0.12±0.2 6~0.6 3±0.2 0m W.E.A−1.涌浪型冰川和非涌浪型冰川的平均质量收支分别为0.03±0.14和−0.05±0.28mW.E.分别为−1。结合前人的研究，我们得出结论，帕米尔中部冰川从20世纪70年代中期到2010年代中期可能一直处于大致平衡的质量预算或轻微的质量赤字状态。
Multiple studies on regional glacier mass balance in the Pamir Mountains have been conducted using the geodetic method, but they were rarely extended to the period before 2000. In this study, we used KH-9 imagery acquired in 1975 to generate the historical DEM for the central Pamir, and then obtained the glacier elevation change by comparing this with the SRTM C-band DEM. The penetration depth of the C-band radar was corrected for different glacier surfaces, i.e. 2.96, 1.68 and 0 m for firn/snow cover, bare ice and debris-covered areas, respectively. The final results suggest that the central Pamir glaciers, overall, experienced a near-zero mass balance of −0.03 ± 0.24 m w.e. a−1 for 1975–99. Due to glacier surge activity, the elevation change patterns of individual glaciers were highly variable, and their mass balances varied from −0.12 ± 0.26 to 0.63 ± 0.20 m w.e. a−1. The mean mass budgets of the surge-type glaciers and non-surge-type glaciers were 0.03 ± 0.14 and −0.05 ± 0.28 m w.e. a−1, respectively. Concurring with previous studies, we conclude that the central Pamir glaciers may have been in a state of approximately balanced mass budget or slight mass deficit from the mid-1970s to the mid-2010s.