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Suitability of fibre-optic distributed temperature sensing for revealing mixing processes and higher-order moments at the forest--air interface

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00005364
URN to cite this document: urn:nbn:de:bvb:703-epub-5364-8

Title data

Peltola, Olli ; Lapo, Karl ; Martinkauppi, Ilkka ; O'Connor, Ewan ; Thomas, Christoph K. ; Vesala, Timo:
Suitability of fibre-optic distributed temperature sensing for revealing mixing processes and higher-order moments at the forest--air interface.
In: Atmospheric Measurement Techniques. Vol. 14 (2021) Issue 3 . - pp. 2409-2427.
ISSN 1867-8548
DOI der Verlagsversion: doi: 10.5194/amt-14-2409-2021

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Project information

Project title:
Project's official titleProject's id
DarkMix - Illuminating the dark side of surface meteorology: creating a novel framework to explain atmospheric transport and turbulent mixing in the weak-wind boundary layer724629

Project financing: 7. Forschungsrahmenprogramm für Forschung, technologische Entwicklung und Demonstration der Europäischen Union
European Union’s Horizon 2020 research and innovation programme

Abstract

The suitability of a fibre-optic distributed temperature sensing (DTS) technique for observing atmospheric mixing profiles within and above a forest was quantified, and these profiles were analysed. The spatially continuous observations were made at a 125 m tall mast in a boreal pine forest. Airflows near forest canopies diverge from typical boundary layer flows due to the influence of roughness elements (i.e. trees) on the flow. Ideally, these complex flows should be studied with spatially continuous measurements, yet such measurements are not feasible with conventional micrometeorological measurements with, for example, sonic anemometers. Hence, the suitability of DTS measurements for studying canopy flows was assessed. The DTS measurements were able to discern continuous profiles of turbulent fluctuations and mean values of air temperature along the mast, providing information about mixing processes (e.g. canopy eddies and evolution of inversion layers at night) and up to third-order turbulence statistics across the forest–atmosphere interface. Turbulence measurements with 3D sonic anemometers and Doppler lidar at the site were also utilised in this analysis. The continuous profiles for turbulence statistics were in line with prior studies made at wind tunnels and large eddy simulations for canopy flows. The DTS measurements contained a significant noise component which was, however, quantified, and its effect on turbulence statistics was accounted for. Underestimation of air temperature fluctuations at high frequencies caused 20 %–30 % underestimation of temperature variance at typical flow conditions. Despite these limitations, the DTS measurements should prove useful also in other studies concentrating on flows near roughness elements and/or non-stationary periods, since the measurements revealed spatio-temporal patterns of the flow which were not possible to be discerned from single point measurements fixed in space.

Further data

Item Type: Article in a journal
Keywords: Fiber-optic distributed sensing; Turbulence; Forest; Airflow
DDC Subjects: 500 Science > 530 Physics
500 Science > 550 Earth sciences, geology
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professor Micrometeorology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professor Micrometeorology > Professor Micrometeorology - Univ.-Prof. Dr. Christoph K. Thomas
Profile Fields > Advanced Fields > Ecology and the Environmental Sciences
Research Institutions > EU Research Projects > DarkMix
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > EU Research Projects
Language: English
Originates at UBT: Yes
URN: urn:nbn:de:bvb:703-epub-5364-8
Date Deposited: 29 Mar 2021 07:17
Last Modified: 29 Mar 2021 07:18
URI: https://epub.uni-bayreuth.de/id/eprint/5364

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