90 



R. T. Prentki et al. 



o 



E 



FIGURE 4-8. Total inorganic carbon in Pond B, 

 1971-1973. 



Partial Pressure of CO 2 



During 1971, continuous measurements of the partial pressure of 

 CO 2 in the water (pCOi) were carried out in Pond C from 9 July to 16 

 August. The next year, continuous measurements were made from 25 June 

 until 15 September of the PCO2 in North Meadow Lake, a shallow (70 

 cm) lake 2 km northeast of the ponds. 



The PCO2 was determined with an IRGA by measuring the CO2 

 concentration of air in equilibrium with the water. Details are given in 



