. Ecological investigations of the tundra biome in the Prudhoe Bay region, Alaska . Fig. 8. Air temperature plot for May 1972. - 5 Temp, C -10 -5 0 01 Density, g cm'^ 3 0,20 0,30 0,50 r * ⦠⦠â â¢- ^ ⢠1 ' 1 1 1 1 1 ' 1 t 1 , I so ^ £ 60 H 40 I 20 ^ â¢'-^^-^ ^ *' a. 28 meters east of P2 (6 meters east of rood) Temp, C Density, g cm'* -15 -10 -5 0 010 0,20 0,50 r 1 â¢^ t » t -1 1 1 1 1 1 1 1 1 â â I" ,±. ( â o o "â " ' . '-^''/^^A i 1 i b, 40 meters eost of P2 Temp,°C Density, g cm'* 15 -10 -5 0 0,10 0,^0 0,30 040 0 50 |20 o 0 c, 90 meters eost of P2 Temp, C
. Ecological investigations of the tundra biome in the Prudhoe Bay region, Alaska . Fig. 8. Air temperature plot for May 1972. - 5 Temp, C -10 -5 0 01 Density, g cm'^ 3 0,20 0,30 0,50 r * ⦠⦠â â¢- ^ ⢠1 ' 1 1 1 1 1 ' 1 t 1 , I so ^ £ 60 H 40 I 20 ^ â¢'-^^-^ ^ *' a. 28 meters east of P2 (6 meters east of rood) Temp, C Density, g cm'* -15 -10 -5 0 010 0,20 0,50 r 1 â¢^ t » t -1 1 1 1 1 1 1 1 1 â â I" ,±. ( â o o "â " ' . '-^''/^^A i 1 i b, 40 meters eost of P2 Temp,°C Density, g cm'* 15 -10 -5 0 0,10 0,^0 0,30 040 0 50 |20 o 0 c, 90 meters eost of P2 Temp, C Density, g cm'* -15 -10 -5 0 0,20 0,30 040 0 50 E40F'=~T l~ S20- , I ~1 T s- E 40 u a 0 d 200 meters eost of P2 Temp, C Density, g cm'* 15 -10 -5 tjl OJO 0,20 0,30 040 0 50 I I -1 "n ~r-r ^ r e 300 meters east of P2 Fig. 9. Pit data from Prudhoe Bay. Based on the data from mid-IVlay (Table 1 and Fig. 8), when daily range of air temperature was 10 to 20°C, let us consider a daily tempera- ture variation of 12°C (from -1°C to -13°C) and calculate the range of temperatures at 10 cm depth intervals in a snowpack 40 cm thick. The range at a selected depth Z is given by Tp = 2Toe ' aP where T is the temperature amplitude at the surface Z is depth below snow surface (cm) a is thermal diffusivity (cm^ sec"^) and P is the period, , 1 day (86,400 sec) The calculated results are summarized in Table 3 and Fig. 11. These values are consistent with the magnitudes of temperature change observed in the snowpack during the cooling trend be- tween 14-16 May (Fig. 10). We can now estimate the daily heat exchange in the snowpack during May by a simple calculation. To do this, we shall use the bottom 40 cm of density data from Fig. 9e (, neglect the top 6 cm of fresh snow) together with the temperature ranges obtained in Table 3 with diffusivity = cm^ sec"^. The calculations are summarized in Table 4. In mid-April 1972 the col
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