Turbulence parameters measured by the Beijing mesosphere–stratosphere–troposphere radar in the troposphere and lower stratosphere with three models: comparison and analyses
Turbulence parameters measured by the Beijing mesosphere–stratosphere–troposphere radar in the troposphere and lower stratosphere with three models: comparison and analyses
复制标题
北京中层-平流层-对流层雷达测量对流层和平流层下层湍流参数三种模型的比较与分析
DOI：
10.5194/amt-15-4785-2022
复制
发表时间：
2022
影响因子：
3.8
通讯作者：
Daren Lü
中科院分区：
文献类型：
--
作者：
Ze Chen;Yufang Tian;Yinan Wang;Yongheng Bi;Xue Wu;Juan Huo;Linjun Pan;Yong Wang;Daren Lü
抽象。基于2012 - 2014年北京MST雷达在3- 19.8km高度范围内的质量控制观测谱宽数据，本文分析了负湍动能比例（N-TKE）与湍流度的关系。以及水平风场的水平风速和垂直切变，给出了大气湍流参数的分布特征。使用不同的计算模型。本研究中使用了三种谱宽方法的计算模型-即H模型（Hocking，1985）、N-2D模型（Nastrom，1997）和D-H模型（Dehghan和Hocking，2011）。结果表明，在H模式、N-2D模式和D-H模式中，N-TKE所占比例随水平风速u和/或水平风速垂直切变的增大而增大，最大值分别为60%、45%和35%。当ε u ε z大于0.006 s-1时，H模型的N-TKE随ε u ε z急剧增加，增加率约为20%0.002s-1。对于这三个模型，除了水平风速的垂直切变大于0.006 s-1外，结果相似。当ε u ε z>0.006 s−1时，N-TKE在N-2D和H模型中的比例随ε u ε z的增加而增加，而在D-H模型中的比例小于10%且变化较小。但在某些大风天气过程中，仍需考虑N-2D模式和D-H模式的适用性。三种模式计算的湍动能耗散率ε和垂向涡动扩散系数Kz随高度的分布特征与前人的研究结果一致。尽管如此，湍流参数的值仍存在差异。雷达的距离分辨率对湍流参数取值范围的差异影响不大。H模型、N-2D模型和D-H模型中ε的中值分别为10−3.2-10−2.7、10−3.0-10−2.6和10−3.3-10−2.8 m2 s−3。这三个模型中Kz的中值分别为100.3-100.7、100.4-100.7和100.1-100.5 m2 s−1。
Abstract. Based on the quality-controlled observational spectral width data of the Beijing mesosphere–stratosphere–troposphere (MST) radar in the altitudinal range of 3–19.8 km from 2012 to 2014, this paper analyses the relationship between the proportion of negative turbulent kinetic energy (N-TKE) and the horizontal wind speed and the vertical shear of horizontal wind domain and gives the distributional characteristics of atmospheric turbulence parameters obtained by using different calculation models. Three calculation models of the spectral width method were used in this study – namely the H model (Hocking, 1985), N-2D model (Nastrom, 1997) and D–H model (Dehghan and Hocking, 2011). The results showed that the proportion of N-TKE in the H model, N-2D model and D–H model increases with the horizontal wind speed u and/or the vertical shear of horizontal wind speed ∂u∂z, and the maximum values are 60 %, 45 % and 35 %, respectively. When the∂u∂z is greater than 0.006 s−1, the N-TKE of the H model increases sharply with ∂u∂z; the increase rate is about 20%0.002s-1. For these three models, the results are similar except that the vertical shear of the horizontal wind speed is greater than 0.006 s−1. When ∂u∂z>0.006 s−1, the proportion of N-TKE in the N-2D and H models increases with ∂u∂z, while the proportion in the D–H model is less than 10 % and has slight variation. However, it is still necessary to consider the applicability of the N-2D model and D–H model in some weather processes with strong winds. The distributional characteristics with height of the turbulent kinetic energy dissipation rate ε and the vertical eddy diffusion coefficient Kz derived by the three models are consistent with previous studies. Still, there are differences in the values of turbulence parameters. Also, the range resolution of the radar has little effect on the differences in the range of turbulence parameters' values. The median values of ε in the H model, N-2D model and D–H model is 10−3.2–10−2.7, 10−3.0–10−2.6 and 10−3.3–10−2.8 m2 s−3, respectively. The median values of Kz in these three models are 100.3–100.7, 100.4–100.7 and 100.1–100.5 m2 s−1.