Estimating Turbulence Intensity in Storms With Phased Array Radar

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Abstract
Pointed herein are differences between turbulence measurements by radars with conventional pencil bean antennas and electronically steering Phased Array Radar (PAR) antennas. Differences are caused by the shape and orientation of the beam cross section on phased array antenna. These depend on the pointing direction and everywhere except at broadside the beam cross section is approximately elliptical. A formalism applicable to pencil beams of circular cross section is extended to elliptic beam cross sections. For lateral dimensions of the radar resolution volume larger than its range extent an approximate formula is suggested for computing the eddy dissipation rate ε. A field of ε1/3 indicative of turbulence affecting aircraft and obtained with a digital PAR is presented as well as values along a radial pointing at a 41.5° elevation.
Funding Information
  • NOAA/Office of Oceanic and Atmospheric Research under NOAA-University of Oklahoma Cooperative, U.S. Department of Commerce (NA21OAR4320204)

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