Mechanisms Controlling the Downstream Poleward Deflection of Midlatitude Storm Tracks

摘要: AbstractThe Atlantic and Pacific storm tracks in the Northern Hemisphere are characterized by a downstream poleward deflection, which has important consequences for distribution of heat, wind, precipitation midlatitudes. In this study, spatial structure is examined tracking transient cyclones an idealized GCM with localized ocean heat flux. The atmospheric response decomposed terms time- zonal-mean background flow, stationary wave, eddy field. Lagrangian used to construct cyclone composites perform spatially varying PV budget. Three distinct mechanisms that contribute tilt emerge: nonlinear advection, latent release, advection. evolution shows different role played wave each region. region where maximized, all three propagation ...