干旱区生态环境知识资源中心(Arid): Characteristics of turbulence over the semi-fixed desert area north of Xinjiang, China

Arid

DOI	10.1002/esp.5182
	Characteristics of turbulence over the semi-fixed desert area north of Xinjiang, China
	Mamtimin, Ali; Wang, Yu; Sayit, Hajigul; Yang, Xing Hua; Yang, Fan; Huo, Wen; Zhou, Chenglong; Jin, Lili
通讯作者	Wang, Y (corresponding author), China Meteorol Adm, Inst Desert Meteorol, Taklimakan Desert Meteorol Field Expt Stn CMA, 327 Jianguo Rd, Urumqi 830002, Xinjiang, Peoples R China.
来源期刊	EARTH SURFACE PROCESSES AND LANDFORMS
ISSN	0197-9337
EISSN	1096-9837
出版年	2021
卷号	46 期号:12 页码:2365-2378
英文摘要	As the largest fixed and semi-fixed desert in China, the Gurbantunggut Desert undergoes a long period of snow cover in the winter and the rapid growth of ephemeral plants in the spring, presenting obvious seasonal changes in the underlying desert surface type, which can lead to variation in the turbulence of the near-surface boundary layer turbulence over the desert. In this study, gradient tower data and eddy covariance data from 2017 were analysed to investigate the turbulence characteristics of the different surface boundary layers in the hinterland of the Gurbantunggut Desert. The results indicate that stable atmospheric conditions in the desert occur exclusively during the early morning and at night in the desert, and the onset and duration of this stable state varies seasonally. Two regimes of intermittent turbulence occur during the night, a weak turbulent regime that occurs when the wind speed is less than the threshold and a strong turbulent regime when the wind speed exceeds the threshold, and different wind speed thresholds were observed at each level. These parameters follow a seasonal pattern of summer (July) > spring (April) > autumn (October) > winter (January) in terms of magnitude. The mean turbulence intensities of the along-wind, cross-wind and vertical wind are 0.5, 0.47 and 0.14, respectively, with I-u > I-v > I-w. The normalized standard deviation of the wind velocity components (sigma(u), sigma(v) and sigma(w)) generally satisfies a 1/3 power-law relation. Our results show that the night-time turbulence regime classification for the Gurbantunggut Desert strongly depends on meteorological and orographic features, and the intermittent turbulent events have the non-stationarity of the flow in common. The results can contribute to the study of land surface processes, climate change and desertification in inland arid desert areas.
英文关键词	Gurbantunggut Desert turbulence characteristics turbulence intensity turbulent kinetic energy turbulent regimes
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000677822600001
WOS关键词	BOUNDARY-LAYER ; SURFACE-LAYER ; REGIMES
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/362960
作者单位	[Mamtimin, Ali; Wang, Yu; Yang, Xing Hua; Yang, Fan; Huo, Wen; Zhou, Chenglong; Jin, Lili] China Meteorol Adm, Inst Desert Meteorol, Taklimakan Desert Meteorol Field Expt Stn CMA, 327 Jianguo Rd, Urumqi 830002, Xinjiang, Peoples R China; [Sayit, Hajigul] Newsroom Xinjiang Meteorol Bur, Urumqi, Peoples R China
推荐引用方式 GB/T 7714	Mamtimin, Ali,Wang, Yu,Sayit, Hajigul,et al. Characteristics of turbulence over the semi-fixed desert area north of Xinjiang, China[J],2021,46(12):2365-2378.
APA	Mamtimin, Ali.,Wang, Yu.,Sayit, Hajigul.,Yang, Xing Hua.,Yang, Fan.,...&Jin, Lili.(2021).Characteristics of turbulence over the semi-fixed desert area north of Xinjiang, China.EARTH SURFACE PROCESSES AND LANDFORMS,46(12),2365-2378.
MLA	Mamtimin, Ali,et al."Characteristics of turbulence over the semi-fixed desert area north of Xinjiang, China".EARTH SURFACE PROCESSES AND LANDFORMS 46.12(2021):2365-2378.