Development Processes of the Explosive Cyclones over the Northwest Pacific: Potential Vorticity Tendency Inversion

Abstract A novel method that quantitatively evaluates the development processes of extratropical cyclones is devised and applied to explosive over Northwest Pacific in cold season (October–April). By inverting potential vorticity (PV) tendency equation, contribution dynamic thermodynamic at different levels cyclone quantified. In terms geostrophic 850 hPa, which utilized quantify development, leading factors for intensification are upper-level PV advection by mean zonal flow production from latent heating. However, also subject hindrances vertical meridional advections. Quantitatively, sum contributions heating, advection, surface temperature about 1.6 times more important than dynamical redistribution horizontal advections on intensification. This result confirms dominant role Pacific. It turns out further analysis interactions lower-level anomalous flows processes, whereas primary processes.