Can statistics of turbulent tracer dispersion be inferred from camera observations of SO2 in the ultraviolet?

Abstract. Turbulence is one of the unsolved problems of physics. Atmospheric turbulence and in particular its effect on tracer dispersion may be measured by cameras sensitive to the absorption of ultraviolet (UV) sun-light by sulfur dioxide (SO2), a gas that can be considered a passive tracer over short transport distances. We present a method to simulate UV camera measurements of SO2 with a 3D Monte Carlo radiative transfer model which takes input from a large eddy simulation (LES) of a SO2 plume released from a point source. From the simulated images the apparent absorbance and various plume density statistics (centerline position, meandering, absolute and relative dispersion, skewness, and fractal dimension) were calculated. These were compared with corresponding quantities obtained directly from the LES. Mean differences of centerline position, absolute and relative dispersion, and skewness between the simulated images and the LES were found to be smaller than a quarter of one camera pixel, with standard deviations between 1/2 and 3/2 camera pixel. Furthermore sensitivity studies were made to quantify how changes in solar azimuth and zenith angles, aerosol loading (background and in plume), and surface albedo impact the UV camera image plume statistics. Changing the values of these parameters within realistic limits have negligible effect on the centerline position, meandering, absolute and relative dispersions, and skewness of the SO2 plume. Thus, we demonstrate that UV camera images of SO2 plumes may be used to derive plume statistics of relevance for the study of atmospheric turbulent dispersion.

• Publication year

  2019

• Venue

  Atmospheric Measurement Techniques Discussions

• Publication date

  2019-07-26

• Fields of study

  Physics, Environmental Science

• Identifiers
  DOI 10.5194/AMT-2019-286
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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  1999cited by this paper
• An experimental study of a reactive plume in grid turbulence

  1996cited by this paper
• Fractal Representation of Turbulent Dispersing Plumes.

  1994influential reference
• An Introduction to Boundary Layer Meteorology

  1988cited by this paper
• AFGL atmospheric constituent profiles (0-120km)

  1986cited by this paper
• A Large-Eddy-Simulation Model for the Study of Planetary Boundary-Layer Turbulence

  1984cited by this paper
• A Model for the Spectral Albedo of Snow. II: Snow Containing Atmospheric Aerosols

  1980influential reference
• A Model for the Spectral Albedo of Snow. I: Pure Snow

  1980influential reference
• The Use of Subgrid Transport Equations in a Three-Dimensional Model of Atmospheric Turbulence

  1973cited by this paper
• Atmospheric Chemistry and Physics Technical Note: the Libradtran Software Package for Radiative Transfer Calculations – Description and Examples of Use

  year unknowncited by this paper

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