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Namib Turbulence Experiment (NamTEX)
Project funded by own resources
Project title Namib Turbulence Experiment (NamTEX)
Principal Investigator(s) Vogt, Roland
Organisation / Research unit Departement Umweltwissenschaften / Atmospheric Sciences (Kalberer)
Project start 01.10.2019
Probable end 31.03.2022
Status Completed
Abstract

In collaboration with the Namib Fog Life Cycle Analysis (NaFoLiCa) project, the proposed research seeks to provide insight in to the fundamental nature of turbulence and improve our understanding of the mechanics of energy and heat exchange between the soil surface and lower atmosphere, analysing the relationship between high-frequency surface temperature fluctuations and the thermal structure of the near-surface (0-3 m) atmosphere. The surface-atmosphere coupling will be observed through dense spatial and temporal sampling of surface, subsurface, and air temperatures in 2- and pseudo 3-dimensions complemented by wind measurements in a variety of stability conditions.

The research objectives are grouped into three themes / goals:

  1. Determine scale-dependence of advection velocities - Measure scale-dependent turbulent advection velocities using temperature as a scalar. Assess whether there are scale-dependent violations of Taylor’s hypothesis and if they can be corrected for using scaling. Determine whether (scale-dependent) advection velocities differ between surface temperature and air temperatures (at different heights).
  2. Conditionally sample turbulent structures using time-sequential thermography (TST) - Observe, characterise, and conditionally sample the spatial realisation of turbulent coherent flow structures in space, using distributed air, surface and subsurface temperature measurements. Check how characteristics scale with integral stability conditions or whether there are intermittent modes of dynamics that cannot be captured with integral measures. Apply thermal image velocimetry to reconstruct the near-surface wind field in 2D and combine this information to add wind to the conditionally sampled flow structures.
  3. Linking energy balance closure to the dynamics of the turbulent spatial temperature field - Explore whether there is any relation between the spatial characteristics of the turbulent surface and air temperature fields at different scales and implications for energy balance closure. Possibly also explore impacts on traditional soil heat flux measurements.
  4. Test new hypothesis concerning energy storage in the soil and evaporation to improve the closure of the energy balance – A detailed monitoring of top soil temperature and humidity will enable a new perspective on the dynamics of soil heat storage and dissipation.
Keywords turbulent exchange, thermography, energy balance closure
Financed by University funds

Cooperations ()

  ID Kreditinhaber Kooperationspartner Institution Laufzeit - von Laufzeit - bis
4614490  Vogt, Roland  Christen, Andreas, Professor  Albert Ludwigs Universität Freiburg  01.10.2019  31.03.2022 
4614491  Vogt, Roland  Bernhofer, Christian, Professor  Technische Universität Dresden  01.10.2019  31.12.2022 
4614492  Vogt, Roland  Pitacco, Andrea, Professor  Università di Padova  01.10.2019  31.03.2022 
   

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