54 M. C. Miller et al. 



TA BLE 3-2 Summer Climate, 1970-1973* 



♦Source: Data and means (50-year except for solar radiation) taken from U.S. 

 Department of Commerce, NOAA, Environmental Data Service, 1970-1971. 



The cloudiness increased each summer from 1971 to 1973; as a result, 

 the solar radiation was drastically reduced over this time (Table 3-2, 

 Figure 3-2). This reduction is important as the water temperature is 

 influenced more by solar radiation than by air temperature. 



TEMPERATURE STUDIES 



Water Temperatures 



Temperatures in the water were recorded hourly in several ponds. 

 Details of methods and data are given in Stanley (1974, 1976a). 



The ponds present a rather simple thermal pattern. In the first place, 

 temperature differences in the water column are only a few tenths of a 

 degree as the winds continually circulate the water. On the few windless, 

 sunny days the convective currents caused by solar heating of the 

 sediments also keep the ponds mixed. Thus, temperature recordings at one 

 depth are sufficient to describe the whole water column. In the second 



