Surface elevation changes of glaciers in the Cordillera Real and Tres Cruces, Bolivia, between 2000 and 2016

During the last decades, climate change has led to a significant shrinkage of glaciers in the Tropical Andes. However, there is a lack of recent multi-temporal quantifications of ice mass loss at mountain range to regional scales. We measure temporally consistent glacier area changes and geodetic mass balances throughout the Bolivian Cordillera Real and Tres Cruces based on multi-sensor remote sensing data in the period 2000-2016. By analyzing interferometric SAR data a geodetic mass balance of -399±98 kg m-2 a-1 and a total ice mass loss of 1.84±0.46 Gt is derived for 2000-2016. In more recent years, ice loss was above the average rate. A mass budget of -467±358 kg m-2 a-1 is found after 2013. These higher change rates can be attributed to the strong El Niño event in 2015/16. The data set consists of elevation change maps for each subregion (R1, R2, R3; see associated article) for the periods 2000-2013, 2000-2016 and 2013-2016. The glacier outlines used to delineate the glacier areas are available via the Global Land Ice Measurements from Space (GLIMS) database. Each elevation change map is a mosaic of several dh/dt GeoTiff data sets. The product is derived from differencing of TanDEM-X and SRTM Digital Elevation Models. See the associated article for further information regarding the generation of the data sets. Please note: The here provided elevation change maps are unfiltered (i.e. no outliers were removed) The "date_merge....." data sets provide information on the observation period (measured in years relative to the date of the start of the observation period). Data sets with observation periods starting in 2000: The mean data of the SRTM mission (2000-02-16) is used as the data reference. Data sets with observation periods starting in 2013: The date of the individual TanDEM-X DEM tiles is used as data reference (date of TanDEM-X tiles in 2013 can be derived from the data sets covering the period 2000-2013; "SRTM mean date" + "date_merge_......2000-2013....")近数十年来，气候变化已导致热带安第斯山脉（Tropical Andes）的冰川出现显著萎缩。然而，当前缺乏针对该山脉范围至区域尺度的近期多时序冰量损失量化研究。本研究基于2000-2016年多传感器遥感数据，对玻利维亚雷亚尔山脉（Bolivian Cordillera Real）与特雷斯科鲁塞斯山脉的冰川面积变化及大地测量质量平衡开展时序一致性测量。通过分析干涉合成孔径雷达（Interferometric SAR）数据，研究得出2000-2016年的大地测量质量平衡为-399±98 kg·m⁻²·a⁻¹，总冰量损失达1.84±0.46吉吨（Gt）。近年来冰量损失速率高于平均水平，2013年后的质量平衡为-467±358 kg·m⁻²·a⁻¹。这类更高的变化速率可归因于2015/2016年的强厄尔尼诺事件。 本数据集包含各子区域（R1、R2、R3，详见相关论文）在2000-2013年、2000-2016年及2013-2016年三个时段的高程变化图。用于划定冰川范围的冰川轮廓数据可通过全球陆地冰川太空测量（Global Land Ice Measurements from Space, GLIMS）数据库获取。每张高程变化图均为多份dh/dt GeoTiff数据集的镶嵌产物，该产品通过对TanDEM-X与航天飞机雷达地形测绘任务（Shuttle Radar Topography Mission, SRTM）数字高程模型进行差分处理得到。有关数据集生成的更多细节，请参阅相关论文。请注意：本文提供的高程变化图未经过滤波处理（即未移除异常值） `date_merge……`数据集提供了观测时段信息（以相对于观测起始年份的时长计）。观测时段始于2000年的数据集：以航天飞机雷达地形测绘任务（SRTM）的平均观测日期（2000-02-16）作为数据参考基准。 观测时段始于2013年的数据集：以单幅TanDEM-X数字高程模型（DEM）瓦片的采集日期作为数据参考基准（2013年的TanDEM-X瓦片日期可从覆盖2000-2013年时段的数据集推导得出，即"SRTM平均日期"+"date_merge_……2000-2013……"）