Upper‐level trajectories in the prototype problem for tropical cyclone intensification

Data from an idealized three-dimensional numerical simulation of tropical cyclone intensification are used to calculate Lagrangian air parcel trajectories emanating the inflow layer that develops beneath upper-tropospheric outflow layer. It is found about half these end up in itself. The other slowly subside mid- upper troposphere, below layer, and drift outwards as a result relatively weak overturning circulation region. Calculations show pseudo-equivalent potential temperature not approximately conserved along trajectories, indicating turbulent diffusion heat moisture and/or latent changes by freezing or melting appreciable troposphere.