Editing Limnology (section)

====Lake Heat Budget====
An annual heat budget, also shown as θ<sub>a</sub>, is the total amount of heat needed to raise the water from its minimum winter temperature to its maximum summer temperature. This can be calculated by integrating the area of the lake at each depth interval (A<sub>z</sub>) multiplied by the difference between the summer (θ<sub>sz</sub>) and winter (θ<sub>wz</sub>) temperatures or <math>\displaystyle \int</math>A<sub>z</sub>(θ<sub>sz</sub>-θ<sub>wz</sub>)<ref name="auto"/>