Eddies in motion : visualizing boundary-layer turbulence above an open boreal peatland using UAS thermal videos

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Alekseychik , P , Katul , G , Korpela , I & Launiainen , S 2021 , ' Eddies in motion : visualizing boundary-layer turbulence above an open boreal peatland using UAS thermal videos ' , Atmospheric Measurement Techniques , vol. 14 , no. 5 , pp. 3501-3521 . https://doi.org/10.5194/amt-14-3501-2021

Title: Eddies in motion : visualizing boundary-layer turbulence above an open boreal peatland using UAS thermal videos
Author: Alekseychik, Pavel; Katul, Gabriel; Korpela, Ilkka; Launiainen, Samuli
Contributor organization: Institute for Atmospheric and Earth System Research (INAR)
Micrometeorology and biogeochemical cycles
Department of Forest Sciences
Ilkka Korpela / Principal Investigator
Forest Ecology and Management
Date: 2021-05-18
Language: eng
Number of pages: 21
Belongs to series: Atmospheric Measurement Techniques
ISSN: 1867-1381
DOI: https://doi.org/10.5194/amt-14-3501-2021
URI: http://hdl.handle.net/10138/331652
Abstract: High-resolution thermal infrared (TIR) imaging is opening up new vistas in biosphere-atmosphere heat exchange studies. The rapidly developing unmanned aerial systems (UASs) and specially designed cameras offer opportunities for TIR survey with increasingly high resolution, reduced geometric and radiometric noise, and prolonged flight times. A state-of-the-art science platform is assembled using a Matrice 210 V2 drone equipped with a Zenmuse XT2 thermal camera and deployed over a pristine boreal peatland with the aim of testing its performance in a heterogeneous sedgefen ecosystem. The study utilizes the capability of the UAS platform to hover for prolonged times (about 20 min) at a height of 500ma.g.l. while recording high frame rate (30 Hz) TIR videos of an area of ca. 430 x 340 m. A methodology is developed to derive thermal signatures of near-ground coherent turbulent structures impinging on the land surface, surface temperature spectra, and heat fluxes from the retrieved videos. The size, orientation, and movement of the coherent structures are computed from the surface temperature maps, and their dependency on atmospheric conditions is examined. A range of spectral and wavelet-based approaches are used to infer the properties of the dominant turbulent scene structures. A ground-based eddy-covariance system and an in situ meteorological setup are used for reference.
Subject: SENSIBLE HEAT-FLUX
COHERENT STRUCTURES
SURFACE
1171 Geosciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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