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Meteorology and Atmospheric Physics

, Volume 127, Issue 3, pp 355–368 | Cite as

Mapping optical ray trajectories through island wake vortices

  • Christopher G. NunaleeEmail author
  • Ping He
  • Sukanta Basu
  • Jean Minet
  • Mikhail A. Vorontsov
Original Paper

Abstract

Optical wave propagation through the atmosphere is complicated by organized atmospheric structures, spanning a wide range of length and time scales, which induce spatio-temporal variability in refraction. Therefore, when considering long-range optical ray trajectories, the influence of such structures on the propagation path becomes significantly more complex compared to a hypothetically homogeneous atmosphere. In this paper, we use a coupled mesoscale model and ray tracing framework to analyze the refractive anomalies associated with the wake vortices induced by three geographically diverse islands under various meteorological conditions. We identify organized mesoscale wake vortices (e.g., von Kármán vortices) which are sometimes capable of distorting optical ray trajectories, through ray bending, tens of meters at a range of approximately 50 km. In addition, we find in some cases that vertical oscillations, or perturbations, to the simulated ray trajectories share a frequency with the vortex shedding frequency on the order of hours. At the same time, it is also observed that the intensity and predictability of the wake vortex-induced ray bending varies from case to case. Collectively, these results highlight the value of using mesoscale models in optical wave propagation studies above conventional approaches which do not explicitly consider horizontally heterogeneous atmospheres.

Keywords

Planetary Boundary Layer Wake Region Vortex Street Wake Vortex Vertical Vorticity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors acknowledge financial support received from the Department of Defense AFOSR under award number (FA9550-12-1-0449) in addition to financial and computational support received from the Renaissance Computing Institute. Any opinions, findings and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the Department of Defense.

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Copyright information

© Springer-Verlag Wien 2015

Authors and Affiliations

  • Christopher G. Nunalee
    • 1
    Email author
  • Ping He
    • 1
  • Sukanta Basu
    • 1
  • Jean Minet
    • 2
  • Mikhail A. Vorontsov
    • 2
  1. 1.Department of Marine, Earth, and Atmospheric SciencesNorth Carolina State UniversityRaleighUSA
  2. 2.Intelligent Optics Laboratory, School of EngineeringUniversity of DaytonDaytonUSA

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