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中国沙漠 ›› 2008, Vol. 28 ›› Issue (6): 1045-1049.

• 沙漠与沙漠化 • 上一篇    下一篇

干旱草原地区起沙通量的初步研究

沈建国1,3, 孙照渤1, 章秋英2, 牛生杰2   

  1. 1.南京信息工程大学大气科学学院, 江苏 南京 210044; 2.南京信息工程大学大气物理与大气环境重点实验室, 江苏 南京 210044; 3.内蒙古自治区气象局, 内蒙古 呼和浩特 010051
  • 收稿日期:2008-04-21 修回日期:2008-08-22 出版日期:2008-11-20 发布日期:2008-11-20

Preliminary Study on Dust Emission Rate over Arid Steppe Area

SHEN Jian-guo1,3, SUN Zhao-bo1, ZHANG Qiu-ying2, NIU Sheng-jie2   

  1. 1.The College of Meteorology Science, Nanjing University of Information Science & Technology( NUIST), Nanjing 210044, China; 2.Key Laboratory of Atmospheric Physics & Atmospheric Environment (LAPE), Nanjing University of Information Science & Technology( NUIST), Nanjing 210044, China; 3.Meteorological Bureau of Inner Mongolia, Hohhot 010051, China
  • Received:2008-04-21 Revised:2008-08-22 Online:2008-11-20 Published:2008-11-20

摘要: 通过宽范围颗粒谱仪WPS以及20 m梯度塔获得的观测资料,计算了朱日和地区沙尘天气下的起沙通量、摩擦速度以及临界摩擦速度,得到以下结论:①起沙通量大小与沙尘天气的强度呈一定的相关关系,随着沙尘天气强度的增大,起沙通量大小也增大。3月26日与4月6日两次沙尘天气下,沙尘暴和扬沙天气的平均起沙通量分别为6.0亿kg·m-2·s-1和4.14亿kg·m-2·s-1。②朱日和地区地表摩擦速度一般都在<1 m·s-1的范围内,n取1或2时,起沙率与Un*线性相关最好。③计算得到了观测粒子段的临界摩擦速度值。临界摩擦速度U*t随着粒径的增加呈先减小后增大趋势。

关键词: 干旱草原, 起沙通量, 摩擦速度, 临界摩擦速度

Abstract: The dust particle concentration data measured by Wide Range Particle Spectrometer and the data observed at a 20 m meteorological tower were used to calculate the dust emission rate, friction velocity and threshold friction velocity over Zhurihe area, Inner Mongolia. The result indicated that: ①The value of dust flux was in accordance with the intense of the dust weather. The average dust flux in dust-storm weather and blowing sand weather were 6.0×10-8 kg·m-2·s-1 and 4.14×10-8 kg·m-2·s-1, respectively. ②The friction velocity(U*) was almost less than 1 m·s-1. The relationship between dust emission rate and friction velocity was analyzed, when n is 1 or 2, the dust flux had the best linear correlation with U*n in Zhurihe area.③The threshold friction velocity of the observed dust diameter width was calculated—it firstly declined then ascended with diameter increasing.

Key words: arid grassland, dust flux, friction velocity, threshold friction velocity

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