作　　者： ; ;

机构地区： 中国气象局广州热带海洋气象研究所

出　　处： 《热带气象学报》 1997年第1期32-39,共8页

摘　　要： 利用１９９０年在海南省海口市天尾村的一次观测的资料，分析了速度分量谱、湍流强度等湍流特征量。这批资料多是有云影响情况下，稳定度参数（Ｌ）与热通量（ｗｔ）没有日变化规律，但湍能、平均温度仍具有日变化规律；湍谱的基本特征与晴天天气的谱基本相似，在惯性副区接近局地各向同性，速度谱符合相似理论的“－２／３”次方规律；根据Ｍ－Ｏ相似理论，探讨了各分量湍强δｉ／Ｕ＊（ｉ＝ｕ，ｖ，ｗ）与稳定度Ｚ／Ｌ的关系，表明各分量湍强与稳定度Ｚ／Ｌ仍具有“１／３”次方规律。 Untill now, there isnt any report on the atmospheric turbulence over tropical coastal area. By use of the observed data collected at Tianwei village of Hainan province in 1990, this paper analyses the turbulence characteristic values such as the velocity spectra and turbulence intensity. Most of these data are influenced by the cloud, and the stability parameter (L) and heat flux ( wt ) are not of daily variation in sunny days, but the turbulence energy and mean temperature are of normal daily variation. The base features of turbulent spectra are similar to those in the sunny days.The result shows that in the near surface layer over tropical coastal area, the turbulent behaviour is nearly consistent with the laws of local isotropy in the inertial subrange, the velocity spectra conform to the “-2/3”law in the Kolmogorovs similarity theory. Based on M O similarity theory, the relationship of the component turbulence intensities δ i/U *(i=u ,v,w ) and stability parameter Z/L has been studied, showing that the relationship displays the “1/3”law, but the turbulence intensity and energy are larger than that over plat and homogeneous terrain.

关 键 词： 大气 湍流 湍流结构 热带 沿海

领　　域： [天文地球] [天文地球]