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DOI | 10.1016/j.atmosres.2020.105312 |
Characteristics of the turbulence intermittency and its influence on the turbulent transport in the semi-arid region of the loess plateau | |
Zhuorui Wei, Lei Zhang, Yan Ren, Wei Wei, ... Ling Kang | |
2020-10-15 | |
发表期刊 | Atmospheric Research |
出版年 | 2020 |
英文摘要 | In this study, observational data from the Semi-Arid Climate and Environment Observatory of Lanzhou University (SACOL) in July 2008 were used to analyze the characteristics of the turbulence intermittency and its influence on the land-atmosphere turbulent transport over the complex terrain of the semi-arid region of the Loess Plateau in summer. Using the Hilbert-Huang transform (HHT), the local intermittent strength of turbulence (LIST) was calculated based on pure dynamics through an automated algorithm to characterize the turbulence intermittency in this region. But LIST misjudged the actual turbulence intermittency under the condition of weak wind and strong radiation. The thermal effects cannot be ignored in this situation and a thermodynamic intermittency correction factor LISTThermal is suggested to modify LIST. Then a new intermittent strength index LISTRevise is proposed, which is assumed to be the weighted average of LIST and LISTThermal according to the stability parameter z/L. LIST (LISTThermal) is closely related to the near-surface wind-speed (sensible heat flux). Most misjudgments of LIST to turbulence intermittency are corrected, and LISTRevise is more consistent with the general diurnal variation of turbulence intermittency. There are overestimations in turbulent standard deviations and fluxes calculated by conventional eddy covariance (EC) method due to sub-mesoscale motions and turbulence intermittency, producing inaccurate quantifications of turbulent mixing and transport in the planetary boundary layer parameterization schemes. After eliminating the influence of it, the relationship between the normalized standard deviations of different meteorological variables and z/L is more consistent with the Monin-Obukhov similarity rule under stable and unstable stratification. |
领域 | 地球科学 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/299163 |
专题 | 地球科学 |
推荐引用方式 GB/T 7714 | Zhuorui Wei, Lei Zhang, Yan Ren, Wei Wei, ... Ling Kang. Characteristics of the turbulence intermittency and its influence on the turbulent transport in the semi-arid region of the loess plateau[J]. Atmospheric Research,2020. |
APA | Zhuorui Wei, Lei Zhang, Yan Ren, Wei Wei, ... Ling Kang.(2020).Characteristics of the turbulence intermittency and its influence on the turbulent transport in the semi-arid region of the loess plateau.Atmospheric Research. |
MLA | Zhuorui Wei, Lei Zhang, Yan Ren, Wei Wei, ... Ling Kang."Characteristics of the turbulence intermittency and its influence on the turbulent transport in the semi-arid region of the loess plateau".Atmospheric Research (2020). |
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