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Variability of the Lagrangian turbulent diffusion in the lower stratosphere

by B. Legras, I. Pisso, G. Berthet, F. Lefèvre
Atmospheric Chemistry and Physics ()


Ozone and nitrous oxide are measured at high spatial and temporal\nresolution by instruments flying on the ER-2 NASA research aircraft.\nComparing the airborne transects to reconstructions by ensemble of\ndiffusive backward trajectories allows estimation of the average\nvertical Lagrangian turbulent diffusion experienced by the air parcels.\nThe resulting estimates show large Lagrangian diffusion of the order of\n0.1 m(2) s(-1) in the surf zone outside the polar vortex and smaller\nvalues of the order of 0.01 m(2) s(-1) inside. Locally, large variation\nof Lagrangian diffusion occurs over mesoscale distances. It is found\nthat high temporal resolution (3 h or less) is required for off-line\ntransport calculations and that the reconstructions are sensitive to\nspurious motion in standard analysed winds.

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