That means 4 , 594 fewer tons of airborne dust each year until at least 2009 这意味着至少到2009年，每年空气中浮尘每年减少4594吨。
3.
Nasa says it ' s prepared to launch shuttle discovery saturday despite some concern that flying foam may harm the space shuttle 美航天航空局说他们准备于周六发射探测号火箭，尽管有些人担心空中浮尘可能会危害到它。
4.
Behind , a cello played by two bows periodically strikes up ? a compelling lament , one year on , for the world trade centre ' s ghostly fallout 其后，两张琴弓共同拉着一把大提琴，演奏周而复始地进行着?牵动人心的哀悼，一年之后，献给世贸中心鬼魅般的浮尘。
5.
In globalization context , we should neither unreasoningly pursue globalization losing our tradition , nor adhere to our tradition and refuse advanced culture 全球化语境中，民族文化既不应盲目追求全球化，成为无根的浮尘；也不应敝帚自珍，固守本民族的传统，拒绝接纳先进的文化。
6.
In early 2001 , there were strong winds , flying dust , flying sand and sandstorms in hexi corridor and part of inner mongolia , which influenced part of the north china , including beijing 2001年年初，河西走廊、内蒙古部分地区出现大风、浮尘、扬沙和沙尘暴天气，并影响到包括北京在内的华北部分地区。
7.
2 ) from the analysis of the aerodynamic parameters and turbulent flux transfer under different synoptic conditions we achieve the conclusion that on sands raising and sandstorm days turbulent momentum and sensible - heat fluxes are important exchange factors in the boundary layer , with turbulent exchange stronger in sandstorm weather than both on fine and sand raising days . prior to the occurrence of such an event , in particular , the super - adiabatic instability in the near - surface boundary will reinforce sandstorm weather condition . 3 ) atmospheric turbulent diffusion parameters z and y have apparent daily variation 沙尘天气下以亲地壳元素为主的气溶胶元素浓度均高于背景大气和浮尘天气，而且沙尘天气强度愈强，元素浓度的增加愈显著；背景大气、浮尘天气条件下亲地壳元素的浓度一般在10 ~ ( - 1 ) 10 ~ 0 g m ~ 3量级，扬沙、沙尘暴时一般达10 ~ 1 g m ~ 3量级，特强沙尘暴时高达10 ~ 2 g m ~ 3量级。
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Abstract : according to the observation of the number concentration spectrum and the mass concentration of atmospheric aerosol , tsp and its particle size distribution , micrometeorology , and the solar spectroscopic radiation , even the neutron activation treatment of sand dust samples in helan mountainous area , the formation law of sandstrom , dust and sand blowing weather and the characteristics of climatic variation in this area and the influence of helan mountain are counted and analysed 文摘:利用贺兰山地区沙尘暴历史资料和综合观测资料，对大气背景、浮尘、扬沙和沙尘暴发生期间的大气气溶胶数浓度谱、质量谱、大气总悬浮颗粒( tsp )及粒径分布、微气象、分光日射观测以及沙尘样品进行中子活化处理，分析了该地区浮尘、扬沙和沙尘暴形成规律，气候变化特征和贺兰山的影响。
9.
Based on the spectral irradiance measured with the sun - atmosphere ultraviolet spectrum radiometer ( sauvs ) developed by the institute of atmosphere physics and the changchun institute of optics and fine mechanics , chinese academy of sciences , measuring the direct and scatter irradiance spectrum of ultraviolet waveband which arrives in beijing global surface , giving a method of retrieving the aerosol optical depth ( aod ) and put up with primary results that exponential function can fit the retrieval results according to its visibility , putting forth different coefficients and functions on variable visibility , also giving a primary analysis on the aod in dust - storm day and some contrast between sun - day and dust - storm day , analyzing the ratio between scatter and total irradiance , and its relationship with atmosphere mass and total atmosphere optical depth , lastly contrasting with the survey results by aeronet beijing station , the results of retrieval is in reason , this work gives some help in researching the co - effect of aerosol - radiance - climate and makes preparation for further survey on the radiance characteristics of dust 利用中国科学院大气物理研究所与长春光学精密机械研究所合作研制的太阳?大气紫外光谱辐射计( sauvs ) ，测量到达北京地表的太阳直接和散射紫外光谱辐射，导出了大气气溶胶的光学厚度。初步结果表明：北京紫外波段大气气溶胶的光学厚度在绝大部分情况下随波长的增加而单调减小，用指数函数可以较好地拟合反演结果，统计得到了三个水平能见度状况下拟合函数的系数值和公式表达式；初步分析了扬沙、浮尘、沙尘暴天气条件下气溶胶光学厚度的特点，并与一般晴朗天气条件下的气溶胶光学厚度特点做了比较分析；分析了太阳紫外谱辐射中散射辐射与大气质量、大气总光学厚度的定性关系和定量表达式；最后与全球气溶胶监测网络( aeronet )北京站的资料做比对，表明反演结果基本合理。
