Shearing stress

From Glossary of Meteorology

shearing stress

Any of the tangential components of the stress tensor.

In meteorology, the shearing stress is often that on a horizontal surface in the direction of the wind:
where μ is the dynamic (molecular) viscosity, u the wind speed, and z the vertical coordinate. A corresponding eddy stress, or Reynolds stress, may be defined, with an eddy viscosity in place of the molecular viscosity.
See also surface friction, Newtonian friction law.