| 基于器测能见度的沙尘暴分析 |
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| 引用本文： | 李红军,袁玉江,何清.基于器测能见度的沙尘暴分析[J].干旱区资源与环境,2007,21(6):142-145. |
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| 作者姓名： | 李红军 袁玉江 何清 |
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| 作者单位： | 中国气象局乌鲁木齐沙漠气象研究所,新疆乌鲁木齐,830002 |
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| 基金项目： | 科技部社会公益研究项目 |
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| 摘 要： | 本文通过分析塔克拉玛干沙漠腹地能见度仪、自动气象站观测沙尘暴的资料,得到:(1)在沙尘暴过程中,器测能见度越小,持续时间越短,随着器测能见度增大,持续时间呈波动增长,持续时间最长的等级是800m,时间为419min。(2)在沙尘暴过程中,器测能见度200m,500m是两个明显的分界点,在分界线左右的能见度持续时间变化较大,最大相差20倍,在<200m,200-500m,500-1000m三段范围内器测能见度持续时间变化不大,最大相差0.8倍,(3)沙尘暴过程中,平均风速的变化趋势是随着器测能见度增大而减小,平均风速最大值出现在能见度400m处,最小值出现在能见度接近1000m处,平均风速11.9m/s,最大风速21.1m/s。器测能见度从400m变化到500m风速有较大减小。气压和相对湿度以器测能见度500m为界,能见度<500m,数值较大,能见度>500m数值较小。(4)根据器测各能见度持续时间、气象要素变化和统计检验,沙尘暴中,在器测能见度500m处各气象要素变化很大,这对沙尘暴分级有积极意义。(5)器测能见度与人工观测值有较大差距,但它们之间有较好相关性,其相关系数是R=0.7993,通过了t检验(α=0.01)。它们之间拟合方程是y=5.746X0.8523。
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| 关 键 词： | 沙尘暴 器测能见度 风速 |
| 文章编号： | 1003-7578(2007)06-142-04 |
| 修稿时间： | 2006年4月27日 |
Analysis on Sandstorm Based on Visibility Observed by Apparatus |
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| LI Hong-jun,YUAN Yu-jiang,HE Qing.Analysis on Sandstorm Based on Visibility Observed by Apparatus[J].Journal of Arid Land Resources and Environment,2007,21(6):142-145. |
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| Authors: | LI Hong-jun YUAN Yu-jiang HE Qing |
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| Abstract: | It presents a study of sandstorm's classification based on data observed by visibility meter and auto-weather station.The results are following:the smaller visibility observed by apparatusis,the shorter the duration is and the smaller frequencyis.With theincreasing of visibility observed by apparatus,theduration increaseswavely.The longest duration grade is 800m,its duration is 419 minutes.(2) The great divide of visibility observed by apparatusis at 200m and 500m.The duration vary greatly near great divide,the maximal difference is 20 times,while in the other range,the maximal difference is 0.8 times.(3) With theincreasing of visibility observed by apparatus,the average wind speed decrease,the maximum is at 400m,the minimum is near 1000m.Theaverage wind speed is 11.9m/s;the maximal wind speed is 21.1m/s,the average wind speed decrease rapidly from 400m to 500m.The 500m is also great divide of air pressure and relative humidity,theirvalues are big before 500m and they are small after 500m.(4)The change ofweather factorsis obvious at 500m of visibility according the test.It is significativefor sandstorm's classification.(5)There is great difference between visibility observed by apparatusand visibility observed by man,but their correlation is good,correlation index is R=0.7993,it passed the t test(α=0.01),the equation is y=5.746X0.8523. |
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| Keywords: | sandstorm visibility apparatus wind speed |
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