Figure 3

Comparison of (a) T_water and 1000lnα_{(carb−water)}; (b) δ¹⁸O_water and δ¹⁸O_carb values of the thirty-three lakes in this study. Black points refer to water temperatures directly recorded by on-site water temperature loggers (T_LMSW). Blue points refer to water temperatures for sites without data loggers and are calculated using the Eq. (1) and are reported as Calculated Mean Summer Water Temperature (T_CMSW). Similar results are obtained using both types of temperature data. Solid lines are least-square linear regression lines. Error bars show standard deviations in each sample. Dotted lines show 95% confidence intervals.