【摘要】 慕士塔格冰川海拔7010m处的冰芯钻孔温度的观测结果表明,该处冰温变化曲线在夏末依然呈暖季型,其冰层的整体温度(-26.17～-25.63℃)和最低温度(-26.17℃)是目前中低纬度山地冰川中最低的,而底部冰床温度(-25.73℃)则是目前所有实测冰床温度资料中最低的.在积累区,海拔6250～7010m之间冰层温度的高度效应显著.10m深处的温度,冰层的最低温度和底部冰床温度随海拔而垂直变化的梯度分别为-0.83℃·100m-1,-0.68℃·100m-1,-0.79℃·100m-1,与气温正常的垂直变化梯度大致相当.更多还原

【Abstract】 Borehole temperatures were measured at the ice-core drilling site （（7 010） m a. s. l.） in the Muztag Ata Glacier in August 2003. The borehole-temperature profile shows a warm type at the end of summer. The ice temperature profile （（-26.17）～（-25.63） ℃） and its minimum （（-26.17） ℃） at this altitude are all the lowest among those measured in the mountain glaciers in the middle-low latitudes, and so is the temperature at the glacier bed. The temperature at the bedrock is （-25.73） ℃, demonstrating that the Muztag Ata Glacier is frozen to its bed. From the measurement, the altitude effect on the ice temperature is very clearly. From （6 250） m a. s. l. to （7 010） m a. s. l., the lapse rates of ice temperature at 10 m depth, the minimum ice temperature and the temperature at bedrock are （-0.83） ℃\5100 m^-1, （-0.68） ℃\5100 m^-1 and （-0.79） ℃\5100 m^-1, respectively. These lapse rates are consistent with normal air temperature lapse rate (（-0.65） ℃\5100 m^-1).更多还原