Lidar-Observed Stress Vectors and Veer in the Atmospheric Boundary Layer

Jacob Berg, Jakob Mann, Edward G. Patton

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

This study demonstrates that a pulsed wind lidar is a reliable instrument for measuring angles between horizontal vectors of significance in the atmospheric boundary layer. Three different angles are considered: the wind turning, the angle between the stress vector and the mean wind direction, and the angle between the stress vector and the vertical gradient of the mean velocity vector. The latter is assumed to be zero by the often applied turbulent-viscosity hypothesis, so that the stress vector can be described through the vertical gradient of velocity. In the atmospheric surface layer, where the Coriolis force is negligible, this is supposedly a good approximation. High-resolution large-eddy simulation data show that this is indeed the case even beyond the surface layer. In contrast, through analysis of WindCube lidar measurements supported by sonic measurements, the study shows that it is only valid very close to the surface. The deviation may be significant even at 100 m. This behavior is attributed to mesoscale effects. © 2013 American Meteorological Society.
Original languageEnglish
JournalJournal of Atmospheric and Oceanic Technology
Volume30
Issue number9
Pages (from-to)1961-1969
ISSN0739-0572
DOIs
Publication statusPublished - 2013

Keywords

  • Atmospheric boundary layer
  • Large eddy simulation
  • Optical radar
  • Vectors

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