Effects of Coastal Orography on Landfalling Cold Fronts. Part I: Dry, Inviscid Dynamics

摘要: Abstract In this study, the interaction of cold fronts with idealized coastal terrain typical western United States and Canada is considered. Two issues are examined. First, what factors that determine strength winds, second, orographic effects on frontal evolution? To address these issues, authors utilize a two-dimensional, Boussinesq terrain-following coordinate numerical model in which uniform prescribed flow forced to move over plateau. The resultant across-mountain velocities characterized by zone strongly decelerated upstream windward slope train inertia-gravity waves downstream. A barrier-jet oriented parallel mountain produced Coriolis force. variations magnitude deceleration barrier jet wide range Froude numbers Rossby described. Steady, linear theory applied plateau shows dete...