首页> 外文期刊>Journal of Glaciology >Mass balance in the Glacier Bay area of Alaska, USA, and British Columbia, Canada, 1995-2011, using airborne laser altimetry
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Mass balance in the Glacier Bay area of Alaska, USA, and British Columbia, Canada, 1995-2011, using airborne laser altimetry

机译:使用机载激光测高仪,美国阿拉斯加冰川湾地区和加拿大不列颠哥伦比亚省的质量平衡,1995-2011年

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The Glacier Bay region of southeast Alaska, USA, and British Columbia, Canada, has undergone major glacier retreat since the Little Ice Age (LIA). We used airborne laser altimetry elevation data acquired between 1995 and 2011 to estimate the mass loss of the Glacier Bay region over four time periods (1995-2000, 2000-05, 2005-09, 2009-11). For each glacier, we extrapolated from center-line profiles to the entire glacier to estimate glacier-wide mass balance, and then averaged these results over the entire region using three difference methods (normalized elevation, area-weighted method and simple average). We found that there was large interannual variability of the mass loss since 1995 compared with the long-term (post-LIA) average. For the full period (1995-2011) the average mass loss was 3.93 ±0.89 Gta~(-1) (0.6±0.1 mw.e.a~(-1)), compared with 17.8Gta~(-1) for the post-LIA (1770-1948) rate. Our mass loss rate is consistent with GRACE gravity signal changes for the 2003-10 period. Our results also show that there is a lower bias due to center-line profiling than was previously found by a digital elevation model difference method.
机译:自小冰河时期(LIA)以来,美国阿拉斯加东南部的冰川湾地区和加拿大不列颠哥伦比亚省经历了重大的冰川退缩。我们使用1995年至2011年间获得的机载激光测高仪海拔数据估算了四个时段(1995-2000年,2000-05年,2005-09年,2009-11年)冰川湾地区的质量损失。对于每个冰川,我们从中心线剖面外推到整个冰川,以估算整个冰川的质量平衡,然后使用三种差异方法(归一化海拔,面积加权方法和简单平均)将这些结果在整个区域中平均。我们发现,自1995年以来,与长期(LIA后)平均值相比,质量损失存在较大的年际变化。在整个期间(1995-2011),平均质量损失为3.93±0.89 Gta〜(-1)(0.6±0.1 mw.ea〜(-1)),而后期的平均质量损失为17.8Gta〜(-1)。 LIA(1770-1948)率。我们的质量损失率与2003-10年期间GRACE重力信号的变化一致。我们的结果还表明,与以前通过数字高程模型差分方法发现的偏差相比,由于中心线轮廓分析而产生的偏差较小。

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