Glacier mass loss in Alaska has implications for global sea level rise, fresh water input into the Gulf of Alaska and terrestrial fresh water resources. We map all glaciers (>4000 km2) on the Kenai Peninsula, south central Alaska, for the years 1986, 1995, 2005 and 2016, using satellite images. Changes in surface elevation and volume are determined by differencing a digital elevation model (DEM) derived from Advanced Spaceborne Thermal Emission and Reflection Radiometer stereo images in 2005 from the Interferometric Synthetic Aperture Radar DEM of 2014. The glacier area shrunk by 543 ± 123 km2 (12 ± 3%) between 1986 and 2016. The region-wide mass-balance rate between 2005 and 2014 was −0.94 ± 0.12 m w.e. a−1 (−3.84 ± 0.50 Gt a−1), which is almost twice as negative than found for earlier periods in previous studies indicating an acceleration in glacier mass loss in this region. Area-averaged mass changes were most negative for lake-terminating glaciers (−1.37 ± 0.13 m w.e. a−1), followed by land-terminating glaciers (−1.02 ± 0.13 m w.e. a−1) and tidewater glaciers (−0.45 ± 0.14 m w.e. a−1). Unambiguous attribution of the observed acceleration in mass loss over the last decades is hampered by the scarcity of observational data, especially at high elevation, and by large interannual variability.

中文翻译：

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1986-2016 年阿拉斯加基奈半岛的冰川质量和面积变化

阿拉斯加的冰川质量损失对全球海平面上升、阿拉斯加湾的淡水输入和陆地淡水资源都有影响。我们绘制所有冰川 (>4000 km2) 在 1986 年、1995 年、2005 年和 2016 年位于阿拉斯加中南部的基奈半岛，使用卫星图像。表面高程和体积的变化是通过将 2005 年先进星载热发射和反射辐射计立体图像与 2014 年干涉合成孔径雷达 DEM 相比较得出的数字高程模型 (DEM) 确定的。冰川面积缩小了 543 ± 123 公里2(12 ± 3%) 在 1986 年和 2016 年之间。2005 年和 2014 年之间的区域质量平衡率为 -0.94 ± 0.12 m 我们 a-1（-3.84 ± 0.50 Gt-1)，这几乎是先前研究中发现的负值的两倍，表明该地区冰川质量损失的加速。湖泊终止冰川的面积平均质量变化最负（-1.37 ± 0.13 m we a-1），然后是陆地终止冰川（−1.02 ± 0.13 m we a-1) 和潮水冰川 (−0.45 ± 0.14 m we a-1）。过去几十年观测到的质量损失加速的明确归因受到观测数据稀缺（尤其是在高海拔地区）和年际变化大的阻碍。