Effective transport speed, ue

Defined as the vertical integral of the concentration-weighted wind speed,

u z C z dz
C z dz
e = ç
( ) ( )
( )

where z is the height above ground, C(z) is the height-variable concentration of pollutant in the cloud, and u(z) is the height-variable wind speed. ue is also known as the cloud advective speed.