| 沙漠地区大气扩散参数特征分析 |
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| 引用本文： | 桑建人,孙继明,牛生杰.沙漠地区大气扩散参数特征分析[J].中国沙漠,2000,20(3):301-304. |
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| 作者姓名： | 桑建人 孙继明 牛生杰 |
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| 作者单位： | 1. 南京大学 大气科学系, 江苏 南京 210093;2. 宁夏气象科学研究所, 宁夏 银川 750002 |
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| 基金项目： | 国家自然科学基金资助!(4 95 65 0 10 ) |
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| 摘 要： | 1996年4月和5月我们分别在内蒙古吉兰泰气象站和银川机场气象台用南京大学大气科学系研制的三分量风速仪,观测了各类不同天气条件下沙漠地区三维风速脉动量u、v和w,根据Taylor湍流统计理论及Hay和Pasquill的假设,统计计算了各湍流特征值,计算分析了湍流场中水平风向和垂直风向的大气扩散参数ey和ez,并结合美制APS-3310A型激光空气动力学气溶胶粒子谱仪的观测结果,初步分析了沙尘天气条件下扩散参数与近地层沙尘气溶胶粒子数浓度和质量浓度的关系。
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| 关 键 词： | 沙漠地区 扩散参数 特征分析 |
| 收稿时间： | 1999-09-06 |
| 修稿时间： | 1999-09-06 |
Features of Atmospheric Diffusion Coefficient in Desert Area |
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| SANG Jian-ren,SUN Ji-ming,NIU Sheng-jie.Features of Atmospheric Diffusion Coefficient in Desert Area[J].Journal of Desert Research,2000,20(3):301-304. |
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| Authors: | SANG Jian-ren SUN Ji-ming NIU Sheng-jie |
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| Institution: | 1. Department of Atmospheric Scienecs of Nanjing University, Nanjing 210093, China;2. Ninxia Institute of Meteorology, Yinchuan 750002, China |
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| Abstract: | The pulsations of the component of three-dimensions wind,u,v and w,under various weather conditions in desert area had been observed by means of the instrument made by Department of Atmospheric Sciences of Nanjing University at the Ji Lantai Station,Inner Mongolia,and the Yinchuan Airport Station on April and May,1996.We had calculated the turbulent features according to taylor's theory of Turbulent Statistic and Hay and Pasquill's hypotheses,and analyzed the horizontal ey and vertical ez of the diffusion coefficients in turbulent flow.Meanwhile,we had preliminarily analyzed the relation of the diffusion coefficient with the numerical density and mass density of surface layer's sand aerosol in sand dust weather combining the observed data by means of Air Dynamics Particle Sizer(spectrometer) Model 3310A made by U.S.A.The results are as follows:①There are the daily variation features ey and ez of turbulent diffusion coefficient apparently.Under clear air condition,both the horizontal ey and vertical ez of diffusion coefficients reach maximum value at 14 o'clock and minimum values from 3 o'clock to 6 o'clock respectively.Moreover,under sand dust weather the daily variations of ey and ez are clearly different from them under clear weather and they are mostly related to the beginning time of sand dust weather.②The vertical ez of diffusion coefficient is smaller than the horizontal ey of diffusion coefficient,and the horizontal ey of diffusion coefficient is more changeful than the vertical ez of diffusion coefficient. |
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| Keywords: | desert area diffusion coefficient feature analysis |
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