effects, as opposed to water cooling effects, have been the most studied with regard to biogeochemical effects. Much of this research is on the long term effects of nuclear power plants on lakes after a nuclear power plant has been removed. Overall, there is support for thermal pollution leading to an increase in water temperatures. When power plants are active, short term water temperature increases are correlated with electrical needs, with more coolant released during the winter months. Water warming has also been seen to persist in systems for long periods of time, even after plants have been removed. When warm water from power plant coolant enters systems, it often mixes leading to general increases in water temperature throughout the water body, including deep cooler water. Specifically in lakes and similar water bodies, stratification leads to different effects on a seasonal basis. In the summer, thermal pollution has been seen to increase deeper water temperature more dramatically than surface water, though stratification still exists, while in the winter surface water temperatures see a larger increase. Stratification is reduced in winter months due to thermal pollution, often eliminating the thermocline. A study looking at the effect of a removed nuclear power plant in Lake Stechlin, Germany, found a 2.33°C increase persisted in surface water during the winter and a 2.04°C increase persisted in deep water during the summer, with marginal increases throughout the water column in both winter and summer. Stratification and water temperature differences due to thermal pollution seem to correlate with nutrient cycling of phosphorus and nitrogen, as oftentimes water bodies that receive coolant will shift toward eutrophication. No clear data has been obtained on this though, as it is difficult to differentiate influences from other industry and agriculture. Similar to effects seen in aquatic systems due to climatic warming of water, thermal pollution has also been seen to increase surface temperatures in the summer. This can create surface water temperatures that lead to releases of warm air into the atmosphere, increasing air temperature. It therefore can be seen as a contributor to global warming. Many ecological effects will be compounded by climate change as well, as ambient temperature rises in water bodies. Spacial and climatic factors can impact the severity of water warming due to thermal pollution. High wind speeds tend to increase the impact of thermal pollution. Rivers and large bodies of water also tend to lose