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Journal article

Variability of the Lagrangian turbulent diffusion in the lower stratosphere

Legras B, Pisso I, Berthet G, Lefevre F, Lef F ...see all

Atmos. Chem. Phys., vol. 5, issue 8286 (2005) pp. 1605-1622

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Abstract

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

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Authors

  • B Legras

  • I Pisso

  • G Berthet

  • F Lefevre

  • F Lef

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