The transfer of mass-balance profiles to unmeasured glaciers
The transfer of mass-balance profiles to unmeasured glaciers
复制标题
将质量平衡剖面转移到未测量的冰川
作者：
M. Kuhn;J. Abermann;M. Bacher;M. Olefs
摘要 对于未测量冰川的质量平衡的估计，其面积随海拔高度的分布s（h）通常是唯一可用的定量信息。适当的具体平衡剖面 b (h) 需要从已测量的冰川转移，其中转移意味着对未测量冰川的地形和气候情况的修改和适应，例如海拔、阳光和风的暴露或温度。本研究提出将区域中位高程 M 作为传输的首要参数。以十个高山冰川为例，量化了 M 和平衡线高度的相似性，并定性地提出了坡向和周围地形的影响。 b (h) 在精确测量的冰川之间的转移产生了 10 年期间平均比平衡差异 150 mm，这对应于中位海拔变化 30 m。根据 1969 年和 1997 年数字高程模型转换的高程变化，将 b (h) 转移到具有 27 个冰川和 23 km2 冰盖的盆地，并根据中位冰川高程进行偏移，同意在 10% 以内。
Abstract For estimation of the mass balance of an unmeasured glacier, its area distribution with altitude, s (h), generally is the only available quantitative information. The appropriate specific balance profile, b (h), needs to be transferred from a measured glacier, where transfer means modification and adaptation to the topographic and climatic situation of the unmeasured glacier, such as altitude, exposure to sun and wind, or temperature. This study proposes the area median elevation, M, as a parameter of prime importance for the transfer. Using as an example ten Alpine glaciers, the similarity of M and equilibrium-line altitude is quantified and the effect of aspect and surrounding topography is qualitatively suggested. The transfer of b (h) between well-measured glaciers yielded differences in the mean specific balance of 150 mm in the mean of a 10 year period, which corresponds to a change in median altitude by 30 m. Transfer of b (h) with a shift according to median glacier elevation to a basin with 27 glaciers and 23 km2 ice cover agreed to within 10% with elevation changes converted from digital elevation models of 1969 and 1997.