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中国农学通报 ›› 2017, Vol. 33 ›› Issue (16): 123-128.doi: 10.11924/j.issn.1000-6850.casb16080011

所属专题: 农业气象

• 资源 环境 生态 土壤 气象 • 上一篇    下一篇

河西走廊东部大风日数时空分布及其对沙尘天气的影响

杨晓玲,周华   

  1. 甘肃省武威市气象局,甘肃省古浪县气象局
  • 收稿日期:2016-08-02 修回日期:2017-05-22 接受日期:2016-12-23 出版日期:2017-06-08 发布日期:2017-06-08
  • 通讯作者: 杨晓玲
  • 基金资助:
    甘肃省气象局第七批“十人计划”;公益性行业(气象)科研专项(重大专项)“我国北方干旱致灾过程及机理”(GYHY201506001-2)。

Gale Days in East of Hexi Corridor: Spatial-Temporal Distribution and Effect on Sand-Dust Weather

  • Received:2016-08-02 Revised:2017-05-22 Accepted:2016-12-23 Online:2017-06-08 Published:2017-06-08

摘要: 摘 要:为揭示大风日数的时空演变规律及其对沙尘天气的影响,更好地防御和减轻风沙灾害。笔者利用1971—2010年河西走廊东部4个气象站大风、沙尘暴、扬沙观测资料,采用气候统计学方法,对河西走廊东部大风日数时空演变及与沙尘暴和扬沙日数的关系进行分析。结果表明:近40年河西走廊东部年大风日数以10.77 d/10 a的速率显著减少;四季年大风日数亦均呈显著减少,递减率夏季最大,冬季最小;年、季节大风日数随年代增加呈减少趋势;大风日数春季最多,秋季最少,4月最多,9月最少。大风日数的空间分布与海拔高低、地形地貌有很大关系,高海拔山区大风日数最多,北部荒漠区以及浅山区较多,绿洲平原区最少。近40年河西走廊东部年沙尘暴和扬沙日数均显著减少。年大风日数与年沙尘暴和扬沙日数呈极显著正相关,其相关系数分别为0878和0.888;大风日数随时间的变化对沙尘日数随时间的变化具有显著正作用,大风日数的减少可能是沙尘日数减少的主要原因之一。

关键词: 红毛丹, 红毛丹, 滴灌施肥, 产量, 果实品质

Abstract: Abstract: The paper aims to reveal temporal and spatial evolution of gale days and it effect on sand-dust weather and defend and mitigate the wind and sand disasters better. Based on gale, sandstorm and flying sand observational data from 4 meteorological stations in east of Hexi corridor from 1971 to 2010, the temporal and spatial evolution of gale days and the relationships between gale days and sandstorm, flying sand days were analyzed. The results show that the annual gale days decrease significantly with the rate of 10.77d/ decade in east of Hexi corridor in recent 40 years, so are the seasonal gale days and the decreasing rate is the largest in summer and is the smallest in winter. The gale days of year and season show decreasing trend with increased of age. The gale days is the most in spring and is the least in autumn, and the maximum occurs in April and the minimum appears in September. The spatial distributions of gale days are related to altitude and topography, the gale days is the most in high altitude mountain and is more in northern desert area and shallow mountain area and is the least in oasis plain. The annual sandstorm and flying sand days decrease significantly in east of Hexi corridor in recent 40 years. The annual sandstorm and flying sand days are significant positive correlations with annual gale days, and the correlation coefficients are 0.878 and 0.888 respectively. The variation of gale days has a remarkable positive effect to the variation of sand-dust days with time, and the decrease of gale days may be one of main reasons for the decrease of sand-dust days.