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Analytic derivation of Monin-Obukhov similarity function for open atmospheric surface layer

Science China(Physics,Mechanics & Astronomy) 2021年第3期64卷 73-83页

作者： Yong Ji Zhen-Su She State Key Laboratory for turbulence and Complex Systems and Department of Mechanics and Engineering Science College of EngineeringPeking UniversityBeijing100871China

The Monin-Obukhov(MO)similarity functionφm of the atmospheric surface layer(ASL)describing the deviation from the log law of the canonical turbulent boundary layer because of thermal stratification has been traditionally determined *** study presents a unified analytic expression derived from a symmetry-based theory of wall turbulence,called structural ensemble dynamics(SED),which postulates a generalized dilation symmetry principle expressing the effect of the wall on turbulence,leading to an analytic multi-regimes expression for the mixing *** ASL in unstable and stable conditions(i.e.,UC and SC),a unified two-regime formula of the mixing length is proposed,leading to aφm,similar to the Businger-Dyer(BD)formula;with a simplified model energy balance equation,φm is completely specified with no free ***,the theory allows the study of the open ASL’s underlying additional physical processes such as bottom-up or top-down flux due to pressure variations *** that Tp is decomposed into shear-like and buoyancy-like components,we propose new explanations for two important features of typical ASL:a significantly smaller Karman constant of 0.36 and a varyingφm for SC mean speed *** theory is validated by the data obtained at Kansas and also at Qingtu Lake Observation Array in Northern China for a variety of heat flux *** conclusion,due to pressure variations,we assert that ASL is intrinsically open and that the current theory offers a new basis for its quantification.

关键词： Monin-Obukhov similarity theory open atmospheric surface layer boundary layer turbulence symmetry-based analysis

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Study on a boundary-layer Numerical Model with Inclusion of Heterogeneous Multi-layer Vegetation

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Advances in Atmospheric Sciences 1999年第3期16卷 431-442页

作者：曾新民赵鸣苏炳凯王汉杰 Department of Atmospheric Sciences Nanjing University Nanjing

On the basis of improving the algorithm of the mixing length in and above forest canopies, a PBL numerical model including the multi-layer, heterogeneous vegetation is developed. Simulations indicate thatdifferent treatments of mixing length can make a great difference in the wind field especially for dense *** results *** the improved mixing length scheme are in better agreement with observations than thosefrom the original scheme. It may be expected that the improved mixing length scheme can lead to more rational turbulent transfer than the original one. From the sensitivity experiments, we obtain the characteristics of both wind and temperature profiles in and above plant canopies, e.g., during the daytime, a stablethermal stratitication exists near the surface in the canopies, but a neutral or slightly unstable condition appears above plant canopies. while at night the reverse situations occur; the increase of the temperature of thedense-forest case is less than that of the sparse-forest case, the windspeed is reduced within the canopy layer and the large wind shear occurs near the treetop, etc.

关键词： Numerical model boundary layer turbulence Vegetation Mixing length

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A NUMERICAL STUDY ON A MULTI layer VEGETATION boundary-layer MODEL

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南京大学学报(自然科学) 1999年第6期 3-5页

作者： Zeng Xinmin Zhao Ming Su Bingkai Department of Atmospheric Sciences, Nanjing University, 210093,Nanjing,PRC)

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0　ＩＮＴＲＯＤＵＣＴＩＯＮＩｔ’ｓｗｅｌｌｋｎｏｗｎｔｈａｔｔｈｅｅｃｏｓｙｓｔｅｍｃａｎｇｒｅａｔｌｙｉｎｆｌｕｅｎｃｅｂｏｔｈｔｈｅｌｏｃａｌｃｌｉｍａｔｅａｎｄｔｈｅｇｅｎｅｒａｌｃｉｒｃｕｌａｔｉｏｎ.Ｏｎｔｈｅｎｕｍｅｒｉｃａｌｓｔｕｄｙｏ...

关键词： Numerical Model boundary layer turbulence Vegetation Mixing Length

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