气候变化领域集成服务门户(CCPortal): Wind lidars reveal turbulence transport mechanism in the wake of a tree

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DOI	10.5194/acp-22-2255-2022
	Wind lidars reveal turbulence transport mechanism in the wake of a tree
	Angelou, Nikolas; Mann, Jakob; Dellwik, Ebba
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	2255
结束页码	2268
卷号	22 期号:4 页码:14
英文摘要	Solitary trees are natural land surface elements found in almost all climates, yet their influence on the surrounding airflow is poorly known. Here we use state-of-the-art, laser-based, remote sensing instruments to study the turbulent wind field in the near-wake region of a mature, open-grown oak tree. Our measurements provide for the first time a full picture of the mixing layer of high turbulence that surrounds the mean wind speed deficit. In this layer, we investigate the validity of a two-dimensional vectorial relation derived from the eddy-viscosity hypothesis, a hypothesis commonly used in modelling the turbulence transport of momentum and scalars in the atmosphere. We find that the momentum fluxes of the streamwise wind component can be adequately predicted by the transverse gradient of the mean flow. Using the mixing-length hypothesis we find that for this tree the corresponding turbulence length scale in the mixing layer can be approximated by one height-independent value. Further, the laser-based scanning technology used here was able to accurately reveal three-dimensional turbulent and spatially varying atmospheric flows over a large plane without seeding or intruding the atmospheric flow. This capability points to a new and more exact way of exploring the complex earth-atmosphere interactions.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000760391400001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273472
作者单位	Technical University of Denmark
推荐引用方式 GB/T 7714	Angelou, Nikolas,Mann, Jakob,Dellwik, Ebba. Wind lidars reveal turbulence transport mechanism in the wake of a tree[J],2022,22(4):14.
APA	Angelou, Nikolas,Mann, Jakob,&Dellwik, Ebba.(2022).Wind lidars reveal turbulence transport mechanism in the wake of a tree.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(4),14.
MLA	Angelou, Nikolas,et al."Wind lidars reveal turbulence transport mechanism in the wake of a tree".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.4(2022):14.