Physics 53 



1200 



FIGURE 3-2. Daily total solar radiation at Barrow, 1971 to 1973 (cour- 

 tesy NOAAJ. The dotted line is the 20-year average (1950-1970). 



The IBP ponds can be separated into two types, based on 

 accumulation of organic sediments. Beneath ponds C, D, E, and F there is 

 an organic layer 20 to 40 cm thick. The ponds to the west have organic 

 accumulations of only 0.5 to 1 1 cm. If this organic matter was in a former 

 lake, it may be deduced that the ponds A through F were located more in 

 the center of a shallow lake. This assumption is based on observations by 

 Carson (1968) of present Barrow lakes which have a gentler and wider 

 littoral zone on their west sides than on their east sides. It is likely that 

 organic detritus deposition would be thickest in the deeper central and 

 eastern side of the basin. 



Summer Climate 



The summers at Barrow during the four years of our study (1970- 

 1973) were slightly warmer than the 30-year mean (Table 3-2). 

 Precipitation was near normal but the average includes a very dry summer 

 (1970) and a very wet summer (1973). 



