气候变化领域集成服务门户(CCPortal): Characteristics of the turbulence intermittency and its influence on the turbulent transport in the semi-arid region of the Loess Plateau

CCPortal

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
	Wei Z.; Zhang L.; Ren Y.; Wei W.; Zhang H.; Cai X.; Song Y.; Kang L.
发表日期	2021
ISSN	0169-8095
卷号	249
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. © 2020 The Author(s)
英文关键词	Loess Plateau; Thermodynamic; Turbulence intermittency; Turbulent transport
语种	英语
scopus关键词	Arid regions; Boundary layers; Heat flux; Landforms; Mathematical transformations; Sediments; Statistics; Turbulence; Wind; Hilbert Huang transforms; Meteorological variables; Monin obukhov similarities; Normalized standard deviations; Parameterization schemes; Planetary boundary layers; Turbulence intermittency; Turbulent transports; Atmospheric thermodynamics; atmosphere-biosphere interaction; semiarid region; thermodynamics; turbulence; turbulent flow; turbulent mixing; wind velocity; China; Loess Plateau
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/162286
作者单位	Laboratory for Climate and Ocean-Atmosphere Studies, Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, 100871, China; Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou, 730000, China; State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, 100871, China; State Key Joint Laboratory of Environmental Simulation and Pollution Control, Department of Environmental Science, Peking University, Beijing, 100871, China
推荐引用方式 GB/T 7714	Wei Z.,Zhang L.,Ren Y.,et al. Characteristics of the turbulence intermittency and its influence on the turbulent transport in the semi-arid region of the Loess Plateau[J],2021,249.
APA	Wei Z..,Zhang L..,Ren Y..,Wei W..,Zhang H..,...&Kang L..(2021).Characteristics of the turbulence intermittency and its influence on the turbulent transport in the semi-arid region of the Loess Plateau.Atmospheric Research,249.
MLA	Wei Z.,et al."Characteristics of the turbulence intermittency and its influence on the turbulent transport in the semi-arid region of the Loess Plateau".Atmospheric Research 249(2021).