北极新奥尔松地区Austre Lovénbreen冰川温度变化特征

Ice Temperature Characteristics of the Austre Lovénbreen Glacier in NY-Ålesund, Arctic Region

  • 摘要: 冰川温度是冰川最重要的物理参数之一。2009~2011年间,在北极新奥尔松地区Austre Lovénbreen冰川上B2E2F点开展了20 m浅层冰温监测工作。结果表明,三点冰温曲线在春季5月表现为冷季型,秋季9月属于暖季型。在9 m深度以下,E2点冰温总是要比B2F点低。三点处冰温活动层下界的深度都为14 m,冰温年平均值分别为-2.76、-3.23和-2.84℃。随着海拔的升高,B2E2点之间20 m深处冰温递减率(0.3℃·100 m-1)要大于10 m深处的(0.15℃·100 m-1)。三点在10 m深处冰温比近地层气温要高1~4℃,这也显示了冰川融水再冻结释放的潜热导致冰川升温的重要性。

     

    Abstract: Ice temperature is one of the most important physical parameters, during the period from 2009 to 2011, observations of ice temperature were carried out on the Austre Lovénbreen glacier in the NY-Ålesund of the arctic region at the points B2, E2 and F, in the layer 20 m below the surface. Ice temperature curves at these three points showed a cold season in May and warm season in September. Below the 9 m depth,the ice temperature at the point E2 was lower than that at points B2 and F. The lower boundary depth of active ice temperature layer at the three points was 14 m deep, with annual mean temperature of -2.76、-3.23 and -2.84℃. With increasing altitude, the lapse rate in the ice temperature at the 20 m depth (0.3℃·100 m-1) was higher than that at 10m depth (0.15℃·100 m-1). Ice temperatures at the 10m depth were higher than the calculated mean annual air temperatures by 1~4℃, demonstrating the impact of refreezing melted glacier surface water on the release of latent heat, causing increasing ice temperature.

     

/

返回文章
返回