Accession Number : AD0665968

Title :   RADIATIVE REGIME OVER ARCTIC TUNDRA,

Corporate Author : WASHINGTON UNIV SEATTLE DEPT OF ATMOSPHERIC SCIENCES

Personal Author(s) : Lieske,Bruce J. ; Stroschein,Leander A.

Report Date : JAN 1968

Pagination or Media Count : 33

Abstract : Incoming short wave, total incoming, and net total radiation were measured continuously near Point Barrow, Alaska (71 degrees N), in 1964 using Kipp and Zonen solarimeters and C.S.I.R.O. radiometers. The incoming short wave radiation reached a maximum monthly energy sum in May. The sum for the year was 343 kJ cm-2. Monthly energy sums of incoming long wave radiation exceeded those of incoming short wave radiation in every month except April and May. The maximum occurred in August, and the sum for the year was 737 kJ cm-2. The net total radiation reached a minimum of -7.7 kJ cm-2 in March and a maximum of 43.2 kJ cm-2 in June; the annual balance was 63.8 kJ cm-2. The radiative regime changed markedly with the melting of the snow in late May, and with the onset of appreciable snow cover in late September. Measurements of tundra albedo during the summer indicated values of 4-34% for various surfaces. The albedo of the grassy surface under the net total radiometer averaged 24%. Empirical relationships were derived for net long wave radiation as a function of cloudiness, and with clear skies as a function of screen temperature. The relationships are similar to those found by Liljequist at Maudheim, Antarctica (71 degrees S). (Author)

Descriptors :   (*SOLAR RADIATION, ARCTIC REGIONS), (*TERRAIN, ARCTIC REGIONS), ALASKA, ALBEDO, SNOW, MELTING, SURFACES, CLIMATE, ATMOSPHERIC PRECIPITATION, CLOUD COVER, METEOROLOGICAL INSTRUMENTS, ATMOSPHERIC TEMPERATURE, SOIL MECHANICS

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE