# What is “qflux” and why is it important for climate models?

Evaluation of the Ocean Q Flux is an example of qflux used in the CESM model.

Why is it important?

The ocean mixed layer contains an internal heat source $Q$ (also called a $Q$ flux), whose values are generally specified by a CAM control run, representing seasonal deep water exchange and horizontal ocean heat transport. For example, using prescribed sea surface temperatures and sea ice distributions, the net surface energy flux over the ocean surface can be evaluated to yield the heat source $Q$.