Convective momentum transport describes a vertical flux of the momentum of horizontal winds or currents. This momentum is carried like a non-conserved flow tracer by vertical air motions in convection.
According to Romps, convective momentum transport in the atmosphere can be understood through 2 mechanisms:
Convective entrainment and detrainment Accelerations by the pressure gradient force
The net effect of these interacting mechanisms depends on the detailed configuration or 'organization' of the convective cloud or storm system.
See also Momentum Convective organization
References