Analysis of AOSERP plume sigma data

  • Author(s) / Creator(s)
  • This analysis of AOSERP sigma data is an attempt to synthesize the available plume dispersion data from the AOSERP study region to derive a useful procedure for predicting the plume sigma values. The report includes a critical review of many of the more widely known sigma specification schemes and an analysis of the characteristics of the sensor systems used to collect the data. With such a background, the discrepancies which existed between the measured plume sigma values and the predicted values were more understandable. The plume dispersion process was treated as a two-stage process with a source-dominated phase and an environmentally dominated phase. In the source-dominated phase, the plume rise and plume geometry are intimately related. It was found that the more recent formulations suggested by Briggs (1975) worked adequately for averaged values. The transition point from the source-dominated to environmentally dominated phases of dispersion (the sigma transition) could be clearly specified theoretically but would be difficult to do reliably in an operational or climatological mode.

  • Date created
  • Subjects / Keywords
  • Type of Item
  • DOI
  • License
    This material is provided under educational reproduction permissions included in Alberta Environment and Sustainable Resource Development's Copyright and Disclosure Statement, see terms at This Statement requires the following identification: \"The source of the materials is Alberta Environment and Sustainable Resource Development The use of these materials by the end user is done without any affiliation with or endorsement by the Government of Alberta. Reliance upon the end user's use of these materials is at the risk of the end user.