Preprints
https://doi.org/10.5194/essd-2020-392
https://doi.org/10.5194/essd-2020-392

  19 Feb 2021

19 Feb 2021

Review status: this preprint is currently under review for the journal ESSD.

The Large-eddy Observatory Voitsumra Experiment 2019 (LOVE19) with high-resolution, spatially-distributed observations of air temperature, wind speed, and wind direction from fiber-optic distributed sensing, towers, and ground-based remote sensing

Karl Lapo1,2, Anita Freundorfer1, Antonia Fritz1,a, Johann Schneider1, Johannes Olesch1, Wolfgang Babel1,2, and Christoph K. Thomas1,2 Karl Lapo et al.
  • 1University of Bayreuth, Micrometeorology Group, Bayreuth, Germany
  • 2Bayreuth Center of Ecology and Environmental Research, BayCEER, Bayreuth, Germany
  • anow at: University of Innsbruck, Innsbruck, Austria

Abstract. The weak-wind Stable Boundary Layer (wwSBL) is poorly described by theory and breaks basic assumptions necessary for observations of turbulence. Understanding the wwSBL requires distributed observations capable of separating between submeso and turbulent scales. To this end, we present the Large Eddy Observatory, Voitsumra Experiment 2019 (LOVE19) which featured 1350 m of fiber optic distributed sensing (FODS) of air temperature and wind speed, as well as an experimental wind direction method, at scales as fine as 1 s and 0.127 m in addition to a suite of point observations of turbulence and ground-based remote sensing. Additionally, flights with a fiber optic cable attached to a tethered balloon provide an unprecedented detailed view of the boundary layer structure with a resolution of 0.254 m and 10 s between 1–200 m height. Two examples are provided demonstrating the unique capabilities of the LOVE19 data for examining boundary layer processes: 1) FODS observations between 1m and ~200 m height during a period of gravity waves propagating across the entire boundary layer and 2) tracking a near-surface, transient submeso structure that causes an intermittent burst of turbulence. All data can be accessed at Zenodo through the DOI https://doi.org/10.5281/zenodo.4312976 (Lapo et al., 2020a).

Karl Lapo et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2020-392', Anonymous Referee #1, 12 Apr 2021
  • RC2: 'Comment on essd-2020-392', Anonymous Referee #2, 03 May 2021

Karl Lapo et al.

Data sets

Large-eddy Observatory, Voitsumra Experiment 2019 (LOVE19) Lapo, Karl, Freundorfer, Anita, Fritz, Antonia, Schneider, Johann, Olesch, Johannes, Babel, Wolfgang, and Thomas, Christoph K. https://doi.org/10.5281/zenodo.4312976

Model code and software

pyfocs v0.5 Lapo, Karl and Freundorfer, Anita https://doi.org/10.5281/zenodo.4292491

Karl Lapo et al.

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Short summary
The layer of air near the surface is poorly understood during conditions with weak winds. Further, it is even difficult to observe. In this experiment we used distributed temperature sensing to observe air temperature and wind speed at 1000 s of points simultaneously every couple of seconds. This incredibly rich data set can be used to examine and understand what drives the mixing between the atmosphere and surface during these weak-wind periods.