AQUEOUS GEOCHEMISTRY OF WESTERN NEW YORK’S MEROMICTIC LAKES DURING SUMMER THERMAL STRATIFICATION
In this study, the water column was investigated during the height of summer thermal stratification. This separates the water column into an epilimnion, metalimnion, hypolimnion and mixolimnion. Field parameters were determined at 1 m intervals, and samples were collected from each layer for laboratory analyses. For all of the lakes, pH is near neutral due to the abundance of carbonate bedrock regionally. Dissolved oxygen drops with depth, approaching anoxic conditions below the chemocline. Results show that the shallower lakes are Na-Cl dominate above the chemocline, but have elevated concentrations of Ca-SO4 below the chemocline. Total conductivity ranges from 0.5 to 1.5 mS in these lakes. Green lake, however, is Ca-SO4 dominate throughout the water column, and has significantly higher total conductivity, ranging from 1.8 to 2.6 mS. Analysis of trace elements and H, O and S stable isotopes is being completed to help elucidate sources of water and possible mixing within these lakes.