Potential of flux-variance and surface renewal methods for sensible heat flux measurements at agricultural and forest surfaces

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F86652079%3A_____%2F17%3A00485223" target="_blank" >RIV/86652079:_____/17:00485223 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Potential of flux-variance and surface renewal methods for sensible heat flux measurements at agricultural and forest surfaces

Popis výsledku v původním jazyce

Two alternative micrometeorological methods, flux-variance (FV) and surface renewal (SR), based onnmeasurements of high-frequency temperature fluctuation and Obukhov length stability parameter, werentested against eddy covariance (EC) sensible heat flux (H) measurements. The study was conducted atnthree sites representing agricultural, forestry, and agroforestry systems. In terms of measurement setup,nthese sites represented surface, roughness, and canopy top layer, respectively. As expected, the best matchnof all the methods was in the surface layer, whilst it was poorer in the roughness and canopy sublayers.nSystematic deviation from EC across all three investigated surfaces was within 16% and 8% for FV and SR,nrespectively. While FV resulted in higher correlation with EC measurements (0.93–0.98 vs. 0.89–0.97),nSR provided less systematic biases (1.02–1.08 vs. 0.94–1.16). In general, both FV and SR provided slightlynhigher H as compared to EC. We suggest that parallel deployment of FV and SR is useful, as both methodsnrequire the same instrumentation yet they are based on sufficiently different theories. Therefore, the agreementnbetween FV and SR increases confidence in the results obtained and vice versa.

Název v anglickém jazyce

Potential of flux-variance and surface renewal methods for sensible heat flux measurements at agricultural and forest surfaces

Popis výsledku anglicky

Two alternative micrometeorological methods, flux-variance (FV) and surface renewal (SR), based onnmeasurements of high-frequency temperature fluctuation and Obukhov length stability parameter, werentested against eddy covariance (EC) sensible heat flux (H) measurements. The study was conducted atnthree sites representing agricultural, forestry, and agroforestry systems. In terms of measurement setup,nthese sites represented surface, roughness, and canopy top layer, respectively. As expected, the best matchnof all the methods was in the surface layer, whilst it was poorer in the roughness and canopy sublayers.nSystematic deviation from EC across all three investigated surfaces was within 16% and 8% for FV and SR,nrespectively. While FV resulted in higher correlation with EC measurements (0.93–0.98 vs. 0.89–0.97),nSR provided less systematic biases (1.02–1.08 vs. 0.94–1.16). In general, both FV and SR provided slightlynhigher H as compared to EC. We suggest that parallel deployment of FV and SR is useful, as both methodsnrequire the same instrumentation yet they are based on sufficiently different theories. Therefore, the agreementnbetween FV and SR increases confidence in the results obtained and vice versa.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

10509 - Meteorology and atmospheric sciences

Projekt

<a href="/cs/project/LO1415" target="_blank" >LO1415: CzechGlobe 2020 - Rozvoj Centra pro studium dopadů globální změny klimatu</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Quo vaditis agriculture, forestry and society under global change? Conference proceeding

ISBN

978-80-87902-22-6

ISSN

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e-ISSN

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Počet stran výsledku

5

Strana od-do

53-57

Název nakladatele

Global change research institute

Místo vydání

Brno

Místo konání akce

Velké Karlovice

Datum konání akce

2. 10. 2017

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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