Numerical simulation of global ozone transport during stratospheric sudden warming
The variation of ozone distribution during a stratospheric sudden warming period was investigated through 3 numerical experiments. The first is a Lagrangian type particle tracing experiment. Air particles were released continuously from 5 different sources into the flows which were simulated from the global model (Koermer, 1980) for the study of the major warming and minor warming. The second was a numerical simulation of ozone transport in an Eulerian system (experiment P1). A 3-D ozone transport-diffusion model in an unequal-distanced vertical resolution system was developed. It was run for 29 consecutive days. In the model, the horizontal and vertical components of eddy diffusivity are computed from the model data (Koermer, 1980) in the case of major warming which was divided into 3 stages: prewarming, warming and after-warming stages. The third experiment was designed to include the photochemical reactions in our model (experiment P2). The computation has been performed for 2 days during the warming period. In the first experiment, air particles at upper levels tend to move poleward and upward (equatorward and downward) at higher (lower) latitudes. In the second experiment, a strong increase in ozone amount does occur at higher latitudes in the stratosphere during the warming period. In the third experiment, the inclusion of photochemical system in the model does not destroy but intensifies the ozone increasing. From the above results, the existence of the Lagrangian-mean indirect and direct circulations of the movements of air particles or ozone molecules caused by the planetary-scale wave activities in the upper and lower stratosphere, appears to explain the phenomenon of the ozone increasing at higher latitudes.
- OSTI ID:
- 6357192
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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