利用塔克拉玛干沙漠北缘肖塘地区涡动相关系统三维方向风速（u，v，w）、气温、CO2、H2O等观测数据，分析了夏季典型晴天不同大气稳定度条件下湍流功率谱和协谱。结果表明：大部分情况下湍流速度谱分布满足-2/3幂指数率，垂直方向高频段惯性副区符合程度更高，水平方向次之；CO2和H2O浓度则符合程度较低；温度谱与无因次频率总体上都具有很好的相关性。垂直风速与径向风速u的协谱斜率拟合值大多数情况下更接近-1，而在近中性层结条件下更符合-4/5斜线。稳定层结条件下的协谱峰值比不稳定层结时更大，且约大一个量级；不稳定层结条件下高频段协谱近直线型下降。u谱对应的谱峰波长随稳定度增加而减小，v谱和T谱对应的谱峰波长随稳定度的增加没有规律性增减；u、v、w、T谱谱峰波长约67~827、69~2417、4~54、12~661 m。
By using three-dimensional wind speed (u, v, w), air temperature, CO2, H2O and other observation data from eddy covariance system in Xiaotang over the northern marginal zone of the Taklimakan Desert, this paper deal with the power spectra and cospectrum of turbulence under different atmospheric stability on typical sunny days in summer. The distribution of turbulent velocity mostly fitted the -2/3 power exponential rate well in Xiaotang, and the vertical high-frequency segment of inertia sub-region more significantly fitted the -2/3 power exponential rate, and then the horizontal direction. The fitting levels of CO2 and H2O were lower. The temperature spectrum has a good correlation with the dimensionless frequency in general. The cospectrum slope fitting values of vertical wind speed and radial wind speed u were large and were closer to -1 in most cases, and were more consistent with -4/5 slashes in the near neutral conditions. The cospectrum peak was larger under stable than that at unstable and it was about one magnitude larger. The cospectrum of high frequency segment decreased almost linearly under unstable conditions. The values of the peak wavelengths corresponding to the u spectrum decreased with the increase of stability, and the values of the peak wavelengths corresponding to the v spectrum and the T spectrum does not increased or decreased regularly with the increase of stability. The values of the peak wavelengths of u, v, w, T were about 67-827, 69-2417, 4-54,12-661 m, respectively.
[1] 张明达,张一平,孙晓敏,等.西双版纳热带季雨林林冠上方湍流谱特征[J].生态学杂志,2009,28(9):1779-1786.
[2] 王介民.山谷城市的近地层大气湍流谱特征[J].大气科学,1992,16(1):11-17.
[3] 刘明星,张宏升,宋星灼,等.不同下垫面温度和湿度湍流谱特征研究[J].北京大学学报(自然科学版),2008,44(3):391-398.
[4] 胡月宏,艾力·买买提明,宗飞,等.新疆戈壁地区近地面大气折射率结构常数观测对比[J].中国沙漠,2017,37(6):1237-1239.
[5] 张强,胡隐樵.大气边界层物理学的研究进展和面临的科学问题[J].地球科学进展,2001,16(4):526-532.
[6] 张强,王蓉,岳平,等.复杂条件陆-气相互作用研究领域有关科学问题探讨[J].气象学报,2017,75(1):39-56.
[7] 杨兴华,李红军,何清,等.塔克拉玛干沙漠荒漠过渡带春季风沙活动特征——以肖塘为例[J].中国沙漠,2012,32(4):915-920.
[8] Champogne F H,Friehe C A,Larue J C,et al.Flux measurements,flux estimation techniques and fine-scale turbulence measurements in the unstable surface layer over land[J].Journal of Atmospheric Science,1997,34:515-530.
[9] Stull R B.边界层气象学导论[M].杨长新,译.北京:气象出版社,1991:1-5.
[10] 刘树华,李洁,刘和平,等.在EBEX-2000实验资料中湍流谱和局地各向同性特征[J].大气科学,2005,29(2):213-224.
[11] 温雅婷,焦冰,缪启龙,等.塔克拉玛干沙漠腹地近地层湍流能谱特征分析[J].中国沙漠,2012,32(6):1716-1722.
[12] Cava D,Giostra U,Tagliazucca M.Spectral maxima in a perturbed stable boundary layer[J].Boundary-Layer Meteorology,2001,100:421-437.
[13] Högstrom U,Hunt J C R,Smedman A S.Theory and measurements for turbulence spectra and variances in the atmospheric neutral surface layer[J].Boundary-Layer Meteorology,2002,103:101-124.
[14] 郑新倩,彭冬梅,吴烨,等.巴丹吉林沙漠北缘拐子湖近地层湍流能谱特征分析[J].沙漠与绿洲气象,2017,11(5):63-69.
[15] 徐自为,刘绍民,宫丽娟,等.涡动相关仪观测数据的处理与质量评价研究[J].地球科学进展,2008,23(4),357-370.
[16] Wyngaar J C.On surface layer turbulence[C]//Haugen D A.Workshop on Micrometeorology.Boston,USA:American Meteorological Society,1973:101-149.
[17] Roth M,Oke T R.Turbulent transfer relationships over an urban surface,I:soectral characteristics[J].Quarterly Journal of the Royal Meteorology Society,1993,119:1071-1104.
[18] Kaimal J C,Wyngmard J C,Isumi Y,et al.Spectral characteristics of surface layer turbulence[J].Quarterly Journal of the Royal Meteorology,1972,98:563-589.
[19] Semdman-Högström A S.Temperature and humidity spectra in the atmospheric surface layer[J].Boundary-layer Meteorology,1973,3:329-347.
[20] 倪攀,金昌杰,王安志,等.科尔沁草地不同大气稳定度下湍流特征谱分析[J].生态学杂志,2009,28(12):2495-2502.
[21] Haugen D A,Kaimal J C,Bradley E F.An experimental study of Reynolds stress and heat flux in the atmospheric surface layer[J].Quarterly Journal of the Royal Meteorological Society,2010,97(412):168-180.
[22] 刘树华,刘和平,Mei X,等.森林冠层上下湍流谱结构和耗散率[J].中国科学(D辑),1998,28(5):469-480.
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