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首页> 外文期刊>Journal of Glaciology >Seasonally stable temperature gradients through supraglacial debris in the Everest region of Nepal, Central Himalaya
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Seasonally stable temperature gradients through supraglacial debris in the Everest region of Nepal, Central Himalaya

机译：通过喜马拉雅市中心珠穆朗玛峰地区的超级透气碎片季节性稳定的温度梯度

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Rock debris covers similar to 30% of glacier ablation areas in the Central Himalaya and modifies the impact of atmospheric conditions on mass balance. The thermal properties of supraglacial debris are diurnally variable but remain poorly constrained for monsoon-influenced glaciers over the timescale of the ablation season. We measured vertical debris profile temperatures at 12 sites on four glaciers in the Everest region with debris thickness ranging from 0.08 to 2.8 m. Typically, the length of the ice ablation season beneath supraglacial debris was 160 days (15 May to 22 October)-a month longer than the monsoon season. Debris temperature gradients were approximately linear (r(2) > 0.83), measured as -40 degrees C m(-1) where debris was up to 0.1 m thick, -20 degrees C m(-1) for debris 0.1-0.5 m thick, and -4 degrees C m(-1) for debris greater than 0.5 m thick. Our results demonstrate that the influence of supraglacial debris on the temperature of the underlying ice surface, and therefore melt, is stable at a seasonal timescale and can be estimated from near-surface temperature. These results have the potential to greatly improve the representation of ablation in calculations of debris-covered glacier mass balance and projections of their response to climate change.
机译：岩石碎屑覆盖了喜马拉雅山脉中部30%的冰川消融区域，并改变了大气条件对物质平衡的影响。冰上碎屑的热特性在白天是可变的，但在消融季节的时间尺度上，受季风影响的冰川的热特性仍然很差。我们测量了珠穆朗玛峰地区四座冰川上12个地点的垂直碎屑剖面温度，碎屑厚度在0.08到2.8米之间。通常，冰上碎屑下的冰消融季节长度为160天（5月15日至10月22日），比季风季节长一个月。碎片温度梯度大致呈线性（r（2）>0.83），当碎片厚度达到0.1米时，测量值为-40摄氏度（-1），当碎片厚度为0.1-0.5米时，测量值为-20摄氏度（-1），当碎片厚度大于0.5米时，测量值为-4摄氏度（-1）。我们的研究结果表明，冰上碎屑对下伏冰面温度的影响，因此对融化的影响，在季节性时间尺度上是稳定的，可以通过近地表温度来估计。这些结果有可能极大地改善碎屑覆盖冰川质量平衡计算中消融的代表性，并预测其对气候变化的响应。

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