surface_downward_eastward_stress_due_to_sea_surface_waves under discussion
Created: Feb. 8, 2021
Proposer: Andy Saulter
Proposed Date: 2021-02-01
Change Date: Feb. 8, 2021, 12:02 p.m.
Unit ref: PASX
The surface called "surface" means the lower boundary of the atmosphere. "Surface stress" means the shear stress (force per unit area) exerted by the wind at the surface. A downward stress is a downward flux of momentum. Over large bodies of water, wind stress can drive near-surface currents. "Downward" indicates a vector component which is positive when directed downward (negative upward). "Eastward" indicates a vector component which is positive when directed northward (negative southward). "Downward eastward" indicates the ZX component of a tensor. A downward eastward stress is a downward flux of eastward momentum, which accelerates the lower medium eastward and the upper medium westward. The specification of a physical process by the phrase "due_to_" process means that the quantity named is a single term in a sum of terms which together compose the general quantity named by omitting the phrase. "Sea surface waves" means the stress associated with form drag over sea surface waves.