Energy balance measurements on a Canadian high Arctic glacier and their implications for mass balance modelling
Energy balance measurements on a Canadian high Arctic glacier and their implications for mass balance modelling
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加拿大高北极冰川的能量平衡测量及其对质量平衡建模的影响
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
M. Sharp
中科院分区：
文献类型：
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作者：
A. Arendt;M. Sharp
约翰·埃文斯冰川上三个气象站的气象测量结果表明：（a）气温的直减率变化很大（数值范围为每100米-0.02至-0.63 ° C），一般低于度日质量平衡模型中的假设值;和（B）度日因子，计算从能量平衡测量在三个站，在整个融化季节趋于增加。度日因子与实测地表水电导率相关良好（r2高达0.50），且年际间关系一致。在约翰埃文斯冰川的度日模型内实施的一个简单的Appledo算法导致平均融化预测，最多0.13 mWE（水当量）更接近观察值比那些依赖于恒定的度日因子在以前的研究中使用的模拟。
Meteorological measurements from three weather stations on John Evans Glacier were used to show that: (a) lapse rates in air temperature were highly variable (values ranged between -0.02 and -0.63°C per 100 m), and generally lower than assumed in degree-day mass balance models; and (b) degree-day factors, calculated from energy balance measurements at the three stations, tended to increase throughout the melt season. Degree-day factors correlated well with measured surface albedo (r 2 as high as 0.50), and relationships were consistent between years. A simple albedo algorithm implemented within a degree-day model for John Evans Glacier resulted in average melt predictions that were up to 0.13 mWE (water equivalent) closer to observed values than those produced by simulations which relied upon constant degree-day factors used in previous studies.