turnover

In Arizona's warmwater lakes, a turnover is typically experienced in the fall and is a phenomenon associated with thermoclines. In this case, the warmer layer of water at the surface cools down, and becomes colder than or as cold as the distinct layer of coldwater below. The result is that the two layers of water mix, eliminating the thermocline and creating a fairly uniform water temperature and perhaps introducing oxygen to the lower levels of the lake. This fall turnover action can result in bottom sediments nutrients being stirred up by the water movement, sometimes stimulating algal growth. The fall turnover typically signals the transition to winter fishing conditions.