中国北方沙尘暴与地温场的相关分析

Correlation Analysis on Soil Temperature Field and Dust-storms in Northern China

利用1954—2003年历年沙尘暴实测资料,分析了沙尘暴与3.2 m深度地温场及降水场的关系。结果表明:强沙尘暴多发年与少发年地温场分布差异明显;多发年地温偏低,少发年地温偏高。4月多雨时,沙尘暴频数少,反之频数多。3.2 m地温具有很好的季际连续性,故可以利用冬季甚至上年秋季的地温场来预测春季沙尘暴频次的多寡。

Based on the meteorological data of representative stations from 1954 to 2003, we analyzed the relationship between sand-dust storms and the soil temperature field at 3.2 m depth and precipitation field. Some conclusions have been obtained： the soil temperature fields showed remarkable differentiation between that in years with more sand-dust storms and that in years with less sand-dust storms; lower soil temperature appeared in more sand-dust storm years, but higher soil temperature appeared in less sand-dust storm years; less sand-dust storms happed in year with more precipitation during April, but more sand-dust storms happed in year with less precipitation during April. It was proved that the soil temperature at 3. 2 m had good seasonal continuity, so that soil temperature in winter even in last autumn can be used to forecast the sand-dust frequency during next spring.