and the mantle adiabat
advective (and conductive) heat transport occurs by the
physical motion of rocks (which carry their heat). Convection is the special
case of cyclical advection, and can be natural (as in the Earth) or forced
(as in stirred porridge)
the rate of advective heat transport is therefore dependant on the velocity
of rock movement.
thermal convection, such as occurs in the mantle asthenopshere,
tends to homogenise the temperature field such that temperature gradients
than in the conductive lithosphere.
vertical temperature variations in convective cells follows
an isentropic gradient, the adiabat, which is ~1°C/km for mantle rocks.
convective temperatures characterised by the potential
Temperature (Tp) projected to the surface of the Earth (Tp ~