首页 > , Vol. , Issue () : -
冰川物质平衡指是反映冰川消融与积累关系的重要指标,也是联系冰川与气候变化的纽带,对于评估冰川动态变化具有十分重要的意义。马兰冰川位于青藏高原可可西里北部,作为东昆仑山系中消融最为剧烈的冰川之一,为了评估其在全球气候变暖背景下的物质平衡变化,利用TerraSAR-X/TanDEM-X合成孔径雷达数据、ICESat-2激光雷达高度计数据、SRTM DEM数据,基于合成孔径雷达干涉测量和激光雷达测高技术对其2000-2020年高程变化进行了研究,并估算了物质平衡。结果表明：近20年来,该区域41条冰川平均表面高程下降-5.64 ± 0.96 m,物质平衡为-0.24 ± 0.06 m w.e.a-1,呈明显负平衡状态。其中,2000-2012年冰川的消融速度(-0. 30 ± 0.04 m w.e.a-1)要略快于2012-2020年消融速度(-0.22 ± 0.11 m w.e.a-1)。结合GPCC(Global Precipitation Climatology Centre)降水与GHCN_CAMS(Global Historical Climatology Network)气温再分析数据集可知：自2000年以来,马兰冰川整体受气温升高影响,消融剧烈,降雨量微弱增加仅弥补了少部分由升温带来的物质亏损,由于2012后气温增速变慢,夏季气温波动降低,导致了冰川在2012-2020年间消融速度有所减缓。此外,根据Landsat遥感影像发现,马兰山南坡存在一条跃动冰川,跃动发生于2007-2012年间,冰川末端在此期间异常增厚并前进了约251m。
Glacier mass balance refers to the balance of solid and liquid water in a certain period of time. It is an important indicator reflecting the relationship between glacier melting and accumulation, as well as a link between glacier and climate change. It is of great significance for evaluating the dynamic changes of glaciers. Malan glacier is located in northern of Hoh Xil, Qinghai-Tibet Plateau, being one of the most severe melting glaciers in the East Kunlun mountains. In order to assess its mass balance changes under the background of global warming, we make use of the TerraSAR-X/TanDEM - X synthetic aperture radar data, ICESat-2 laser radar altimeter data, SRTM DEM data to study its high elevation changes between 2000 and 2020 and estimate mass balance, based on synthetic aperture radar interferometry technique and laser radar technology. The final results showed that the average surface elevation of all 41 glaciers in Malan Mountain decreased by 5.64 ± 0.96 m in the past 20 years and the glacier mass balance was -0.24 ± 0.06 m w.e.a?1, indicating a strong negative balance state and a drastic ablation of the region. Additionally, the melting rate of glaciers between 2000 and 2012 (-0.30 ± 0.04 m w.e.a-1) was slightly faster than that between 2012 and 2020 (-0.22 ± 0.11 m w.e.a-1).The difference of the melting speed before and after 2012 was due to the climate change based on the investigation of the GPCC (Global Precipitation Climatology Centre) and the GHCN_CAMS (Global Historical Climatology Network) reanalysis dataset. Combining the precipitation and temperature data, we found that Maran Glacier has been affected by rising temperatures in general, increased rainfall has just made up for few of the mass losses caused by ice melting. Due to the rising rate of temperature after 2012 is slower than that before it and the summer temperature even decline with fluctuation, melting speed of the glacier slows down. In addition, according to Landsat remote sensing images, there is a surge-type glacier on the southern slope of Malan Mountain, the surge process of which occurred between 2007 and 2012. As a result of glacier surging, the end of the glacier thickened abnormally and advanced about 251m during this time.