Mixing of polar vortex air into middle latitudes as revealed by tracer-tracer scatterplots

Ozone/tracer relations in the polar vortex

Impact of mixing and chemical change on ozone-tracer relations in the polar vortex R. Müller, S. Tilmes, P. Konopka, J.-U. Grooß, and H.-J. Jost ICG I, Forschungszentrum Jülich, 52425 Jülich, Germany Bay Area Envrionmental Research Institute, Sonoma, CA, USA now at: ACD, NCAR, Boulder, CO, USA Received: 8 June 2005 – Accepted: 6 July 2005 – Published: 10 August 2005 Correspondence to: R. Müller...

Impact of mixing and chemical change on ozone-tracer relations in the polar vortex

Tracer-tracer relations have been used for a long time to separate physico-chemical change from change caused by transport processes. In particular, for more than a decade, ozone-tracer relations have been used to quantify chemical ozone loss in the polar vortex. The application of ozone-tracer relations for quantifying ozone loss relies on two hypotheses: that a compact ozone-tracer relation i...

Tracer particle momentum effects in vortex flows

The measurement of vortex flows with particle-image velocimetry (PIV) is particularly susceptible to error arising from the finite mass of the tracer particles, owing to the high velocities and accelerations typically experienced. A classical model of Stokes-flow particle transport is adopted, and an approximate solution for the case of particle transport within an axisymmetric, quasi-two-dimen...

Air Change Measurements Using Tracer Gases

Diagnosing transport and mixing using a tracer-based coordinate system

The advection-diffusion equation for the concentration of a tracer may be transformed into a pure diffusion equation by using the area inside concentration contours as a coordinate. The corresponding effective diffusivity depends on the geometry of the tracer field, which is determined by the underlying flow. Recent studies have used effective diffusivity, calculated from a suitable tracer, as ...