The theoretical determination of the same quantities based upon the two- dimensional model shows a somewhat different behavior. The maximum column density agrees in order of magnitude quantitatively but has a very slow rise time when compared to the empirical results. It has a very broad peak at around 300 s and shows only a small decrease by as late as 600 s. The e- folding time of the fall-off is approximately 2000 s. The total number of 0(1D) increases very slowly out to 500 s and then remains constant over the time of the computer simulation. The very slow time variation in the theoretical calculation seems due to the persistance of the ice cloud and its slow sublimation. Better quantitative and qualitative consistency can be achieved by fairly simple changes in the sublimation model.
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