Jordtemperaturmålinger i Frederikshåb

Abstract

For two years, 1/9/1961 - 31/8/1963, temperature measurements have been carried out at Frederikshåb (South Greenland) by GGU (Geological Survey of Greenland) and GTO (Technical Organization of Greenland). The measurements were carried out as an extension of the measurements made at Godthåb in the years 1949 - 60 (unpublished). The temperatures were measured with eleven thermistores placed in nearly water saturated fine to coarse silt. The thermistores were placed at ca. 0.5 m depth intervals, starting with a depth of 0.5 m, ending with 5.5 m (see fig. 2). For the entire period readings were taken daily at 12.00. The temperature readings are believed to be correct within 0.3 - 0.4 °C. Monthly and yearly means have been calculated (Table II). As yearly means for the years involved were nearly the same, the results have been combined to show a "mean year" (curves fig. 3). The curves show a marked skewness, the temperature in boring no. 11 rising for only three months of the year while going down for nine months. The effect has been reduced to rising temperature for five months, falling for seven months, in boring no. 1. The time lag between the maximum or minimum for the two curves is approx. three months. The damping of the amplitudes of the curves with increasing depth has been used to calculate the depth at which the temperature range is less than the error of the thermistores. This calculated depth is approx. eight meters.