Title page for ETD etd-12152010-142448

Type of Document Dissertation
Author Augustine, Andrew Douglas
Author's Email Address aaugus4@lsu.edu
URN etd-12152010-142448
Title An Assessment of Atmospheric Factors Impacting Tropospheric Ozone in the Baton Rouge, Louisiana, Non-attainment Zone
Degree Doctor of Philosophy (Ph.D.)
Department Geography & Anthropology
Advisory Committee
Advisor Name Title
Rohli, Robert V Committee Chair
Brown, David P Committee Member
Hsu, Shih A Committee Member
Wang, Lei Committee Member
Friedland, Carol Jean Dean's Representative
  • air pollution
  • synoptic climatology
  • ozone
  • ozonesonde
Date of Defense 2010-12-07
Availability unrestricted
Baton Rouge, Louisiana, is one of the metropolitan areas in the United States that currently does not meet the national ambient air quality standard for tropospheric ozone. In addition to petrochemical and other industrial activities, the climatological characteristics of the area meaningfully impact the development of tropospheric ozone. This research study attempts to assess factors contributing to elevated concentrations of tropospheric ozone.

Hourly observations of surface ozone concentrations were analyzed for eleven ambient air quality stations in the Baton Rouge metropolitan nonattainment zone (BRNAZ). Data covering a 15-year period, January 1993 Dec 2007, was characterized according to varying temporal scales: annually, seasonally, monthly, and daily. Utilizing an environment-to-circulation approach, surface ozone concentrations were related to broad-scale steering circulation patterns.

The combination of principal components analysis and k-means cluster analysis enabled the 700 hPa geopotential height fields for 792 days which experienced elevated ozone (70 ppb) to be categorized into nine clusters, representing the major modes of synoptic variability related to surface ozone concentrations in the BRNAZ. Overall ozone forcing patterns were broadly determined to be synoptic subsidence, Gulf High, and non-meteorological related.

The third major component of this study involved a series of ozonesonde launches in the spring of 2006. The primary purpose of the launches was to investigate the diurnal variation in the vertical distribution of tropospheric ozone within the BRNAZ. The data collected indicated subsidence, radiational cooling, frontal passage, advection, and turbulent mixing influenced the development of tropospheric ozone.

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