文摘
δ18O, δ2H measured in 300 shield lakes situated north of Lake Superior, Canada. Evaporation/inflow ranged from 9 to 28% (mean of 18% overall) for 6 blocks. Water yield ranged from 285 to 490 mm yr−1 (averaging 377 mm yr−1). Stratification is shown to affect water yield estimates by less than 20%. Acid sensitivity likely enhanced by relative disconnection of many lakes.