| 巴丹吉林沙漠北缘拐子湖近地层湍流能谱特征分析 |
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| 引用本文： | 郑新倩.巴丹吉林沙漠北缘拐子湖近地层湍流能谱特征分析[J].新疆气象,2017,11(5):63-69. |
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| 作者姓名： | 郑新倩 |
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| 作者单位： | 新疆兴农网信息中心 |
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| 基金项目： | 国家自然科学基金（41505008、41575008、41305107） |
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| 摘 要： | 利用2013年6月巴丹吉林沙漠拐子湖地区流沙下垫面的陆气通量观测资料,计算并分析了该研究区不同大气稳定层结条件下的湍流速度各分量谱和温度谱及湍流的局地各向同性特征。结果表明:该研究区风速各分量的湍流强度随平均风速的增加而逐渐减小,当平均风速2 m/s时,风速各分量的湍流强度逐渐稳定且基本限定在0.5以内。在不同大气稳定度下,湍流速度和温度能谱曲线在惯性副区内逐渐有合并趋势且遵循Kolmogorov提出的-2/3定律,速度各分量谱在高频段均满足各向同性且符合低频限制理论。随着稳定度的增加,风速分量的能谱曲线逐渐降低且向高频端移动,风速分量和温度能谱对应的谱峰长度则逐渐减小。该研究区水平湍流尺度范围为9.0~600 m,垂直湍流谱峰波长为10.79~75 m。该结果介于草地和森林下垫面之间,与塔克拉玛干沙漠腹地的试验结果较为接近。
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| 关 键 词： | 巴丹吉林沙漠 湍流 大气稳定度 能谱分析 局地各向同性 |
| 收稿时间： | 2017/3/1 0:00:00 |
| 修稿时间： | 2017/4/15 0:00:00 |
Characteristics of surface-layer turbulence spectra under different atmospheric stability in Guaizi lake region of BadainJaran desert |
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| zheng xinqian.Characteristics of surface-layer turbulence spectra under different atmospheric stability in Guaizi lake region of BadainJaran desert[J].Bimonthly of Xinjiang Meteorology,2017,11(5):63-69. |
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| Authors: | zheng xinqian |
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| Institution: | Xinjiang Agro-Meteorolical Observatory, Urumqi, China |
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| Abstract: | In this paper, we analyzed the turbulence spectral characteristics of wind speed (u, v, w) and temperature and the turbulence spectral local isotropy of the Guaizi lake shifting sandy land in different atmospheric stable stratification condition by use of land-atmosphere turbulent flux data in June 2013. The result indicated that the turbulence intensity of wind speed (u, v, w) decreased with the increase of wind speed, which was gradually stabilized and less than 0.5 when average wind speed > 2 m/s. Under different atmospheric stable stratification condition, the wind speed and temperature spectra had concentrated tendency and they followed the -2/3 law in the higher frequency. The wind speed (u, v, w) spectra fit lower frequency limit for isotropy. With the increase of atmospheric stable stratification condition, the curve of wind speed (u, v, w) spectra decreased gradually and then moved toward the region of higher frequency, and the peak wavelength of the wind speed and temperature spectra decreased gradually. In Guaizi lake shifting sandy land, the horizontal peak wavelength of the wind speed ranged from 9.01 to 600 m, and the vertical peak wavelength of the wind speed ranged from 10.79 to 75 m. The values of the peak wavelength were between the value in forest and in grassland, and they were similar to that of Taklimakan Desert. |
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| Keywords: | Badain Jaran desert turbulence atmospheric stability spectra analysis local isotropy |
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