Ecological investigations of the tundra biome in the Prudhoe Bay region, Alaska ecologicalinvest00brow Year: 1975 38 to the Bechtel Garage in 1973. The albedo data at Prudhoe Bay do not represent the undisturb- ed tundra since the snow in that area is generally contaminated by dust from industrial activities, mainly road dust, and by natural dust from sand dunes in the Sagavanirktok River delta area. The actual measuring locations were selected to represent approximately average snow condi- tions. Albedo measurements over a shallow snowpack in situations with high incoming solar radiation ar
Ecological investigations of the tundra biome in the Prudhoe Bay region, Alaska ecologicalinvest00brow Year: 1975 38 to the Bechtel Garage in 1973. The albedo data at Prudhoe Bay do not represent the undisturb- ed tundra since the snow in that area is generally contaminated by dust from industrial activities, mainly road dust, and by natural dust from sand dunes in the Sagavanirktok River delta area. The actual measuring locations were selected to represent approximately average snow condi- tions. Albedo measurements over a shallow snowpack in situations with high incoming solar radiation are extremely sensitive to any man- made or natural disturbances. Although care was taken to disturb the snowpack as little as possi- ble in connection with installation of the equip- ment and daily maintenance and inspection, some disturbances of the snowpack could not be avoided. These disturbances had a noticeable effect on the breakup patterns around the radio- meter stands. The variations of the incoming short-wave radiation and the albedo at Prudhoe Bay for the summers of 1972 and 1973 are given in Fig. 22. The general features of the radiation regime for coastal tundra are well-known since the radia- tion climate at Barrow has been investigated for many years (Ray 1885; Thornthwaite and Mather 1956, 1958; Kelley et al. 1964, 1969; Lieske and Stroschein 1968; Lieske and Bailey 1969; Weaver 1969, 1970; Weller et al. 1972, 1974; Maykut and Church 1973). During break- up, there is generally a sharp drop of the albedo from values above 80 to values of about 15-20. The lowest values are obtained when the tundra is wet (Weller et al. 1972). At Prudhoe Bay the albedo generally varied be- tween 10 and 15 after breakup in 1973. One of the most striking features in Fig. 22 is the high variability of the incoming radiation. The cloud conditions along the coastal zone of the Arctic Ocean are similar throughout the summer with persistent decks of low stratus. On the average the National
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