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在资料比较稀少的山地冰川进行辐射收支研究对于揭示现代冰川发育的水热条件以及冰川与气候的相互关系具有重要意义。利用祁连山老虎沟12号冰川海拔5 040 m自动气象站资料,分析了2008年10月20日至2009年10月19日的辐射各分量年变化和平均日变化特征,结果表明:整年气温月平均值都高于冰川表面温度,大气是冰川的感热热源。受高海拔、云和地形的共同作用,老虎沟地区的太阳总辐射年总量达6 937.9 MJ/m2;有21天瞬时总辐射超过太阳常数,最大值为1 675 W/m2;总辐射和反射辐射的平均日变化呈单峰型,春夏季节辐射强度相差不大,冬季最小;大气和地面长波辐射的平均日变化呈单峰单谷型,夏季辐射强度最强,冬季最弱,春秋相差不大;秋冬季反照率大于春夏季,年平均值为0.74;净辐射日变化出现明显的季节差异,在4～8月为正值,其他月份为负,冰川表面辐射能量全年收入小于支出。
Radiation budget research on mountain glaciers with relatively rare data is of great significance to reveal the hydrothermal conditions of glacier development and the relationship between glaciers and climate. Based on the data of 5 040 m automatic weather station at glacier No. 12 in Qilian Mountains, the annual variation and average diurnal variation of the radiation components from October 20, 2008 to October 19, 2009 are analyzed. The results show that the annual temperature The average is higher than the glacier surface temperature, the atmosphere is a hot source of heat of the glacier. Due to the combination of high altitude, cloud and topography, the annual total solar radiation in Laohugou area reached 6 937.9 MJ / m2. There were 21 days instantaneous total solar radiation exceeding the solar constant with a maximum value of 1 675 W / m2. The total radiation and The average diurnal variation of reflected radiation was unimodal, with no significant difference in spring and summer radiation intensity and the smallest in winter; the average diurnal variation of atmospheric and ground surface longwave radiation showed a single peak and single valley with the strongest radiation intensity in summer and the weakest in winter, The difference between the autumn and winter was greater than that in spring and summer, the annual average was 0.74; the seasonal variation of net radiation appeared obvious seasonal variation from April to August and the other months were negative; the annual income of glacier surface radiation energy was less than expenditure.