_:b1217606 "The top-most layer in a thermally stratified lake, occurring above the deeper hypolimnion. It is warmer and typically has a higher pH and dissolved oxygen concentration than the hypolimnion."^^ . _:b1217606 . _:b1217606 "Wikipedia:Epilimnion"^^ . _:b1217606 . _:b1217606 .