Toward the Dynamical Convergence on the Jet Stream in Aquaplanet AGCMs

摘要: AbstractSystematic sensitivity of the jet position and intensity to horizontal model resolution is identified in several aquaplanet AGCMs, with coarser producing a more equatorward eddy-driven stronger upper-tropospheric intensity. As models increases 50 km or finer, show signs convergence within each group. The mechanism for this behavior investigated using hybrid Eulerian–Lagrangian finite-amplitude wave activity budget developed absolute vorticity. results suggest that poleward shift higher can be attributed smaller effective diffusivity midlatitudes allows survive dissipation reach subtropical critical latitude breaking. enhanced breaking associated irreversible vorticity mixing act maintain peak ...