Faculty of Geomatics, National-Local Joint Engineering Research Center of Technologies and Applications for National Geographic State Monitoring, Gansu Provincial Engineering Laboratory for National Geographic State Monitoring, Lanzhou Jiaotong University, Lanzhou, 730070, Gansu, China.
Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, National Cryosphere Desert Data Center, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, Gansu, China.
Environ Monit Assess. 2024 Sep 21;196(10):966. doi: 10.1007/s10661-024-13130-y.
Steady glacier runoff is related to the security and resilience of water resources in meltwater recharge basins, so the status and change of glaciers and their response to climate change in the upper reaches have received widespread concerns. Here, the spatiotemporal characteristics of glacier wastage in the Upper Reaches of Shule River Basin (URSRB) driven by climate change were analyzed based on multi-source and multi-temporal remotely sensed images. Firstly, we extracted multi-temporal glacier outlines from the Landsat time series data using Google Earth Engine (GEE) for seven different periods every approximately 5 years from 1990 to 2020. The spatiotemporal analysis of URSRB glaciers demonstrates a sustained reduction in glacier area from 481.07 ± 24.24 km in 1990 to 384.05 ± 22.71 km in 2020, corresponding to a glacier shrinkage rate of - 0.67 ± 0.23%/year, characterized by considerable temporal variability. Secondly, multi-temporal DEMs derived from ASTER stereo imagery spanning from 2000 to 2020 were used to compute the glacier surface elevation changes and determine the glacier mass loss. The overall glacier surface elevation change rate was - 0.32 ± 0.14 m/year, equivalent to a mass balance of - 0.28 ± 0.12 m w.e./year. Lastly, to better apprehend the long-term response of URSRB glaciers to climate change, studies on climate change were carried out based on the EAR5-Land reanalysis dataset. The long-term trend of glacier wastage is attributed to the increase in summer temperature, and the negative effects of increased summer temperature on glaciers exceeded the positive effects of increased annual precipitation. In summary, glaciers in the URSRB have experienced a significant area reduction and accelerated mass loss against the backdrop of climatic warming and humidification.
稳定的冰川径流量与融水补给流域水资源的安全性和弹性有关，因此上游冰川的状况和变化及其对气候变化的响应受到广泛关注。本研究基于多时相、多源遥感影像，分析了气候变化驱动下疏勒河流域上游（URSRB）冰川消融的时空特征。首先，我们使用 Google Earth Engine（GEE）从 Landsat 时间序列数据中提取了 1990 年至 2020 年每约 5 年七个不同时期的多时相冰川轮廓。URSRB 冰川的时空分析表明，冰川面积持续减少，从 1990 年的 481.07 ± 24.24km²减少到 2020 年的 384.05 ± 22.71km²，冰川退缩率为-0.67 ± 0.23%/年，具有较大的时间变异性。其次，我们利用 ASTER 立体图像生成的多时相数字高程模型（DEM），计算了冰川表面高程变化，确定了冰川质量损失。整体冰川表面高程变化率为-0.32 ± 0.14m/年，相当于质量平衡为-0.28 ± 0.12m w.e./年。最后，为了更好地了解 URSRB 冰川对气候变化的长期响应，我们基于 EAR5-Land 再分析数据集进行了气候变化研究。冰川消融的长期趋势归因于夏季温度的升高，夏季温度升高对冰川的负面影响超过了年降水量增加的积极影响。综上所述，在气候变暖增湿的背景下，疏勒河流域上游的冰川经历了显著的面积减少和加速的质量损失。
