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  • 1
    Call number: ZSP-202-115
    In: Research report / Cold Regions Research and Engineering Laboratory, 115
    Description / Table of Contents: SUMMARY Between 1 July and 7 August 1960, the U.S. Army Snow Ice and Permafrost Research Establishment, Corps of Engineers, supported a £our-man glaciological expedition on the southern dome of the Greenland ice sheet. Measurements of snow temperature, density, ram hardness, and grain size were made at seven pit ~tudies along 191 mileS of over-snow traverse. In addition to the pit studies, 38 Rammsonde profiles were measured and 166 shallow pits were dug to measure temperature in the first meter of snow. The annual accumulation of snow was found to decrease westward, from 97 em water equivalent 50 miles from tP.e east coast, to 40 em 80 miles from the western margin. A possible precipitation shadow was encountered immediately west of the crest line of the ice sheet. The precipitation shadow and the decrease in accumulation westward indicate that the source area for the precipitation lies to the east of the southern dome, in the. Greenland Sea. Temperature profiles in the firn indicated that summer warming was still in progress. During August, melting at an elevation of 2000 m above se~ level was intense (OC in the top 75 em} •. According to the facies classification of glaciers (Benson, 1959, 1960}, most of the study area is in tfie percolation facies, with the possible exception of the westernmost· s.tation (mile l-138) which is at or near the saturation line. The daily heat exchange in the first meter of snow, near the time of maximum melt conditions, is between 20 and '35 cal/cinZ. This is approxi-mately 25o/o of the heat necessary to raise the temperature of a column of firn of unit cross Section and 1 m deep to the melting point. Effective values of thermal conductivity and diffusivity as determined from the temperature curves with no attempt made to isolate radiation and con-vection are, respectively, 4-6 x 10-3 cgs and 20-30 x 10-3 cgs. Radiation and convection in the first meter of firn cause "effective conductivity" values to be 4 to 7 times greater than the value k = 0. 0068pZ given by Abel's (1892), which is the conductivity at greater depths.
    Type of Medium: Series available for loan
    Pages: v, 22, A4, B1 Seiten , Illustrationen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory 115
    Language: English
    Note: CONTENTS Preface Summary Introduction Method of investigation Location Pit studies Temperature Hardness Density Stratigraphic measurements Thermal studies Stratigraphic features Grain size Grain shape Crusts Discussion of results Temperature Altitude gradient Latitude gradient Depth-density relationship Depth-load relationship Densification Stratigraphic analysis Facies relationship Climatological aspects 1960 meteorological observations Temperature Wind Barometric pressure Radiation Cloudiness Visibility Thermal studies Summary and conclusions References Appendix A Appendix B
    Location: AWI Archive
    Branch Library: AWI Library
    Location Call Number Expected Availability
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