The role of gravity wave generated advection and diffusion in transport of tracers in the mesosphere

摘要: A two-dimensional model is used to study the comparative roles of advection and turbulent diffusion in controlling tracer transport meridional plane mesosphere. The Lindzen gravity wave drag parameterize effects waves on zonal mean circulation. Sensitivity tests are conducted determine circulation vertical by small-scale turbulence accounting for transport. We compare a case which modeled using Lindzen's parameterization eddy coefficient with that employs much reduced diffusivity based calculations Schoeberl. Integrations carried out simulated annual cycle order test sensitivity distribution assumed magnitude coefficient. In both cases, plays secondary role compared tracers chemical lifetimes greater than about 10 days. conclude global mesosphere long-lived tracers, such as water vapor carbon monoxide, dominated advection, one-dimensional models should be regarded circulation, not mixing diffusion.