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Night-time airflow in a forest canopy near a mountain crest
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SYSNO ASEP 0348522 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Night-time airflow in a forest canopy near a mountain crest Author(s) Sedlák, Pavel (UFA-U) RID, ORCID
Aubinet, M. (BE)
Heinesch, B. (BE)
Janouš, Dalibor (UEK-B) RID, SAI
Pavelka, Marian (UEK-B) RID, ORCID, SAI
Potužníková, Kateřina (UFA-U) RID, ORCID
Yernaux, M. (BE)Source Title Agricultural and Forest Meteorology. - : Elsevier - ISSN 0168-1923
Roč. 150, č. 5 (2010), s. 736-744Number of pages 9 s. Language eng - English Country NL - Netherlands Keywords Spruce forest ; Canopy layer ; Slope ; Drainage flow ; Wind profile Subject RIV DG - Athmosphere Sciences, Meteorology R&D Projects IAA300420803 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) KJB3087301 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z30420517 - UFA-U, BC-A (2005-2011) AV0Z60870520 - UEK-B (2005-2011) UT WOS 000278244400010 DOI 10.1016/j.agrformet.2010.01.014 Annotation Night-time airflow within a deep and dense canopy near the top of a mountain ridge is investigated based on measurements at Bily Kriz, Czech Republic. A decoupled two-layer structure of canopy flow typically develops at night. While the above-canopy flow is most frequently an upslope-directed larger-scale flow over the ridge, the lower-canopy flow is downslope. However, the lower-canopy flow can be forced upslope when the wind speed above the canopy exceeds a well-defined limit. Less frequently, on the lee slope to the larger-scale flow, both the above-canopy and the lower-canopy flow are usually downslope, although a flow reversal in the lower canopy is also observed, accompanied with a large shear stress (friction velocity) above the canopy. We introduce a simple diagnostic model, which gives realistic values of the downslope or upslope direction and speed of the lower-canopy flow that agree well with the measurements. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2011
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