Seasonal Thermal Cycle of Lake Erie

摘要: A summary of the seasonal water temperature characteristics Lake Erie and 1979 1980 thermal structure in central basin is described. Ice cover extends over 90% most winters. Minimum surface usually occurs February (0.1° C) but fully mixed conditions at 1°C or less occur January with isothermal (1°C) occurring from mid-February to mid-March. The bar advance lasts about 5 6 weeks April mid-May permanent stratification begins mid-June maximum heat storage mid-August overturn mid-September. thermocline position varies significantly year year, variability upper lower mesolimnion boundaries being as large 10 m. Thermocline shows some dependence on prevailing meteorological has implications development anoxia. Temperature increases decreases depicted isotherm plots for stations show correspondence peak wind stress events. During fragile stability conditions, even moderate stresses than 0.5 dynes/cm2 are capable producing layer deepening. Episodes complete vertical mixing response high 3 during storm periods observed. Double thermoclines evident several locations within changes resulting an influx hypolimnetic Pennsylvania Ridge documented. Periods entrainment clearly observed along tilting 1 2 meters toward south.