[show abstract][hide abstract] ABSTRACT: Results are described from four years of mass balance measurements near the ice margin of the Greenland ice sheet in the period 1990-1994. The profiles of the specific balance indicate that a simple linear regression between elevation and specific balance is not valid. Meteorological measurements carried out during the first two summers, enable an explanation of the observed specific balance. The gradient in the absorbed shortwave radiation just below the equilibrium-line is higher than on the lower parts of the ice sheet. This results in a stronger mass balance gradient just below the equilibrium-line than near the ice margin.
[show abstract][hide abstract] ABSTRACT: We present four years of mass balance measurements for a transcct in the ablation zone of the Greenland ice sheet (near Sondre Stromfjord, West Greenland). The measurements cover an altitude range of 337 to 1524 m. The mean equilibrium line-altitudc is found to be 1424 m. The largcst balance gradient is found just below the equilibrium line. This is a consequence of the albedo pattern, showing the smallest values in the middle of the ablation zone and not at the ice margin.
[show abstract][hide abstract] ABSTRACT: To suppress the recording of temperature variations caused by small scale convective air movements from hot paving or car exhausts, an air-temperature is recorded which is the average temperature from four positions on a horizontal line across the front of a car, spaced at 0.5 m intervals at a height of 2 m above the ground. Mean air-temperatures, based on data from 90 traverses through the City of Utrecht in December 1969, January and February 1970, and the influence of a city-square on the horizontal temperature distribution are discussed.