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首页> 外文期刊>Boundary-layer Meteorology >Effects of Mesoscale Surface Heterogeneity on the Afternoon and Early Evening Transition of the Atmospheric Boundary Layer
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Effects of Mesoscale Surface Heterogeneity on the Afternoon and Early Evening Transition of the Atmospheric Boundary Layer

机译：介质表面异质性对大气边界层的午后和初期过渡的影响

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摘要

Large-eddy simulation is used to examine the afternoon and early evening transition of the atmospheric boundary layer (ABL) over heterogeneous surfaces with respect to the decay of the turbulence kinetic energy (TKE). The heterogeneous surface sensible heat flux is prescribed based on the inverse transform of the Fourier spectrum whose slope is controlled to behave as kappa 0documentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$ kappa<^>{0} $$end{document}, kappa-1documentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$ kappa<^>{ - 1} $$end{document}, kappa-2documentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$ kappa<^>{ - 2} $$end{document}, and kappa-3documentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$ kappa<^>{ - 3} $$end{document} (where kappadocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$ kappa $$end{document} is the wavenumber) in the wavelength range from 18 to 0.2 km. The kappa 0documentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$ kappa<^>{0} $$end{document} slope spectrum corresponds to a randomly homogeneous field of surface flux, which is implicitly assumed in the grid cells of most large-scale models. The spectral slopes of negative exponents represent heterogeneous surface fields with a larger negative exponent describing stronger mesoscale heterogeneity. The results for a homogeneous surface flux are consistent with that of previous studies in which, during the transition period, the decay of the volume-averaged TKE normalized with the convective velocity scale follows the power law tau-ndocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$ au<^>{ - n} $$end{document} (where taudocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$ au $$end{document} is time normalized by the eddy turnover time scale) for exponents n = 1, 2, and 6.
机译：对于湍流动能（TKE）的衰减，大涡模拟用于检查大气边界层（ABL）的午后和傍晚过渡。基于傅立叶频谱的逆变换规定了异构表面明智的热通量，其斜率被控制为kappa 0 documentclass [12pt] {minimal} usepackage {ammath} usepackage {isysym} usepackage {amsfonts} usepackage {amssymb} usepackage {amsbsy} usepackage {mathrsfs} usepackage {supmeek} setLength { oddsideDemargin} {-69pt} begin {document} $$$ kappa <^> {0} $$ end {document }，kappa-1 documentclass [12pt] {minimal} usepackage {ammath} usepackage {isysym} usepackage {amsfonts} usepackage {amssys} usepackage {amsbsy} usepackage {mathrsfs} usepackage {supmeek} setLength { oddsidemargin} { - 69pt} begin {document} $$ kappa <^> { - 1} $$ end {document}，kappa-2 documentclass [12pt] {minimal} usepackage {ammath} usepackage {visysym} usepackage {amsfonts} usepackage {amssymb} usepackage {amsbsy} usepackage {mathrsfs} usepackage {supmeek} setLength { oddsideDemargin} { - 69pt} begin {document} $$ kappa <^> { - 2} $$ end {document}，和kappa-3 documentclass [12pt] {mi nimal} usepackage {ammath} usepackage {kyysym} usepackage {amsfonts} usepackage {amssymb} usepackage {amsbsy} usepackage {mathrsfs} usepackage {supmeek} setLength { oddsidemargin} {-69pt} begin {文档} $$ kappa <^> { - 3} $$ end {document}（其中kappa documentclass [12pt] {minimal} usepackage {ammath} usepackage {keysym} usepackage {amsfonts} usepackage {amsymb } usepackage {amsbsy} usepackage {mathrsfs} usepackage {supmeek} setLength { oddsidemargin} { - 69pt} begin {document} $$ kappa $$$$ end {document}是波浪长范围内的波浪数从18到0.2公里。 kappa 0 documentClass [12pt] {minimal} usepackage {ammath} usepackage {isysym} usepackage {amsfonts} usepackage {amssys} usepackage {mathrsfs} usepackage {supmeek} setLength { ODDSIDEMARGIN} { - 69pt} begin {document} $$ kappa <^> {0} $$ end {document}斜率对应于随机均匀的表面通量领域，其在大多数网格单元中隐含地假设大型模型。负口指数的光谱斜率表示具有更大的负指数的异质表面场，所述负指数描述较强的Mesoscale异质性。均匀表面通量的结果与先前的研究的结果一致，其中在过渡期间，在过渡期间，与对流速度级标准化的体积平均TKE的衰减遵循电力律Tau-n DocumentClass [12pt] {最小} usepackage {ammath} usepackage {asysym} usepackage {amsfonts} usepackage {amssymb} usepackage {amsbsy} usepackage {mathrsfs} usepackage {supmeek} setLength { oddsideDemargin} { - 69pt} begin {document $$ tau <^> { - n} $$ end {document}（其中tau documentclass [12pt] {minimal} usepackage {ammath} usepackage {isysym} usepackage {amsfonts} usepackage {amssymb} usepackage {amsbsy} usepackage {mathrsfs} usepackage {supmeek} setLength { oddsidemargin} { - 69pt} begin {document} $$$ tau $$ end {document}是由涡流周转时间尺度标准化的时间）对于指数n = 1,2和6。

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