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Different Turbulent Regimes and Vertical Turbulence Structures of the Urban Nocturnal Stable Boundary Layer

Advances in Atmospheric Sciences 2023年第6期40卷 1089-1103页

作者： Yu SHI Qingcun ZENG Fei HU Weichen DING Zhe ZHANG Kang ZHANG Lei LIU State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China

Turbulence in the nocturnal boundary layer(NBL)is still not well characterized,especially over complex underlying ***,gradient tower data and eddy covariance data collected by the Beijing 325-m tower were used to better understand the differentiating characteristics of turbulence regimes and vertical turbulence structure of urban the *** for heights above the urban canopy layer(UCL),the relationship between turbulence velocity scale(VTKE)and wind speed(V)was consistent with the“HOckey-Stick”(HOST)theory proposed for a relatively flat *** regimes have been identified according to urban nocturnal stable boundary *** 1 occurs where local shear plays a leading role for weak turbulence under the constraint that the wind speed VVT and is mainly driven by bulk *** 3 is identified by the existence of moderate turbulence when upside-down turbulence sporadic bursts occur in the presence of otherwise weak *** 4 is identified as buoyancy turbulence,when V>VT,and the turbulence regime is affected by a combination of local wind shear,bulk shear and buoyancy *** turbulence activities demonstrated a weak thermal stratification dependency in regime 1,for which within the UCL,the turbulence intensity was strongly affected by local wind shear when Vupsidedown structure showed an increase at low *** upside-down structures were also characterized by the highest frequency of the stable stratifications in the higher layer.

关键词： urban canopy layer stable boundary layer upside-down turbulence vertical structure

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To afforest the desert with the technology of peat composed of rotten mosses and the sustainable development of the oases

引用

Science China Earth Sciences 2002年第Z1期45卷 87-90页

作者：王周琼 Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China

Only by providing the good conditions for the growth of plants can a favorable ecologicalenvironment on which human beings rely for existence be created. The upside-down-T dou-ble-layer water-conserving afforestation way is developed according to the situation of the short-age of water resources, low soil fertility and vast land in the arid areas. The characteristics of theafforestation way are to change the microenvironment in the root area of the plants, provide thefavorable conditions for the growth of plants, and reduce the necessary conditions for the growth ofplants in large areas in the arid regions. Meanwhile, the size of its water-conserving layer can bechanged according to the size of the planted trees. The different ways of the bottom wa-ter-conserving layer can be used according to the requirements. The afforestation way is suitablefor planting trees on a small scale and also for afforesting on a large scale under the adverse cir-cumstances in the arid areas, and has been effectively used in the afforestation in the hinterland ofTaklamakan Desert and the southern marginal zone of Gurbantonggut Desert. The prospects ofthe afforestation way are broad in afforestation and desertification control in the desert regions.

关键词： upside-down T-shaped afforestation way, microenvironment in root area of plant, desertification control.

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