Meteorological investigation of ozone anomalies during the Arctic Boundary Layer Experiment (ABLE 3A). Ph.D. Thesis
The enhancements in tropospheric ozone that were found during the Arctic Boundary Layer Experiment (ABLE 3A) have been investigated to determine the ozone`s origin and the physical mechanisms involved in producing the observed summertime high latitude distributions. These meteorological analyses of potential vorticity, isentropic trajectories, time-series plots, cross-sections, parcel time-series and total ozone column values describe the mechanisms responsible for the observed ozone enhancements. Based on the analysis, a meridional structure is proposed for the Arctic summer. Two ideal case scenarios are developed to describe the major mechanisms for producing tropopause folds over the summertime high latitudes. This analysis is then used to estimate the summertime high latitude flux of ozone due to tropopause folding, high pressure-induced subsidence, and the relocation of the tropopause during the dissipation of the polar vortices. These estimates indicate that the mechanism for the stratospheric exchange over these regions is from tropopause relocation in the polar vortices. This source mechanism`s estimated 1.2 x 10(exp 11) molecules/sq cm flux almost completely offsets Jacob et al.`s estimated losses due to net photochemical destruction (8.0 x 10(exp 10) molecules/sq cm s) and surface depositional loss (8.2 x 10(exp 10) molecules/sq cm s). In addition, this high latitude summertime mechanism could potentially contribute as much as 25% of the yearly average global ozone flux from the stratosphere. Understanding this mechanism in more detail should be a high priority for future assessments of the factor controlling ozone`s summertime tropospheric distribution over these regions.
- Research Organization:
- Georgia Inst. of Tech., Atlanta, GA (United States)
- OSTI ID:
- 218158
- Report Number(s):
- N-96-21338; NIPS-96-33365; TRN: 9621338
- Resource Relation:
- Other Information: TH: Ph.D. Thesis; PBD: Jan 1994
- Country of Publication:
- United States
- Language:
- English
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