作者：申彦波,沈志宝,杜明远,汪万福

机构：中国科学院寒区旱区环境与工程研究所,中国科学院寒区旱区环境与工程研究所,农业环境技术研究所,敦煌研究院保护研究所 甘肃兰州　730000 ,甘肃兰州　730000 ,日本筑波　305-8604 ,甘肃敦煌　736200

中文关键词：沙尘天气;;沙尘浓度指数;;粒子数浓度;;沙漠;;绿洲;;临界摩擦速度

英文关键词：Dusty weather; Dust Concentration Index; Particle number concentration; Desert; Oasis; Threshold friction velocity

中文摘要：利用中日合作"风送沙尘的形成、输送机制及其对气候与环境影响(ADEC)的研究"项目敦煌站的观测资料,分析了2001年和2002年春季沙尘天气过程中两个沙尘参量———沙尘浓度指数(DCI)和粒子数浓度(N(d))的变化以及摩擦速度(u )和风速(u)与地面风蚀起沙的关系。结果表明:可用DCI=0.2作为扬沙、浮尘等一般沙尘天气的临界值,DCI=0.4作为沙尘暴天气的临界值;沙地和农田上起沙的临界摩擦速度分别约为0.5m·s-1和0.3m·s-1,临界风速分别约为7m·s-1和3m·s-1。农田和沙地起沙临界摩擦速度的差异,导致绿洲站沙尘天气发生的频数比沙漠站大;与地面起沙量有关的总沙尘粒子数浓度N(d>0.5μm)近似与u2 成比例。

英文摘要：Using the observational data of Dunhuang from "Japan and China joint project on aeolian dust experiment on climate (ADEC) impact", the variation of two dusty parameters\_Dust Concentration Index(DCI)and Particle Number concentration(N(d)) and the relations of friction velocity(u*), wind speed(u) and dust outbreak from ground surface in spring of 2001, 2002 were analyzed. It concludes that the threshold DCI of common dusty weather is 0.2 and the threshold DCI of dust storm weather is 0.4; the thresholdfriction velocityis about 0.5 m·s-1 at desert and 0.3 m·s-1 at oasis and the thresholdwind speed is about 7 m·s-1 at desert and 3 m·s-1 at oasis. The difference of threshold friction velocity at desert and oasis results in that the occurring frequency of the dusty weather at oasis is more than that at desert. Last, it means that the total dust particle number concentrationN(d>0.5 μm) is proportional to u2* approximatively.

[中文刊名]：高原气象 [出版日期]：2003-08-28 [CN]：62-1061/P [ISSN]：1000-0534

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