Speaker
Wayne Hocking
(University of Western Ontario)
Description
Due to the intermittency and spatial distribution of small layers of turbulence in the stratosphere, determination of large-scale diffusion coefficients is a non-trivial process. Previous models have assumed that all layers are perfectly mixed, but generally spatio-temporally disconnected. Our new model allows for partially mixed layers, especially for large and intense layers, which has profound effects on the global-scale diffusion coefficient. We also better represent the spatio-temporal distribution using a 2-dimensional model, as distinct from the more common one-dimensional model. Our newer
model is used in combination with balloon and aircraft measurements of layer thicknesses and distributions to place limits on the possible values of large-scale diffusion in the stratosphere and upper troposphere. The values in the stratosphere are particularly well confined.
Author
Wayne Hocking
(University of Western Ontario)
Co-authors
Dr
David Tarasick
(Environment Canada)
Dr
Mohammed Osman
(Environment Canada)
