摘要
沙尘暴作为多种因素共同作用的产物,其成因机制的研究不可忽视地球外部环境的影响。通过对49年间(1954-2002)中国北方223例典型强沙尘暴事件分析,计算出了沙尘暴发生日期的月球黄经λm、太阳黄经λs,得到月相角D=(λm-λs)。运用统计分析的方法,发现沙尘暴发生的频次与月相角有明显的相关关系。研究结果发现∶(1)沙尘暴发生的频次的极大值区在〔30°,42°〕和〔306°,318°〕的月相角区间内,低值区在〔78°,90°〕和〔258°,270°〕的月相角区间内;(2)沙尘暴发生有明显的小周期(1/4月波),同时,文章还分析了月相对沙尘暴发生的调制机制,探讨月相影响下固体潮、重力场、大气压等对沙尘暴影响的数量级。
The co- relationship between Typical Strong Sandstorm and lunar phase angles is investigated in this paper. Time of each sandstorm event is change into lunar astronomic longitude（kin） and solar longitude（ks）, and the lunar phase angle of event is calculated with D = λm- λs. Frequency of event withD ±6° is investigated and we find that optimal angles for frequency over double standard deviation are around [ 30°, 42°] and [306°, 318°]. we try to analysis the relation by Tide Theory. The earth tide has changed the superficial property and the motion characteristic of sand, which makes the geotexture of sand loose. In the influence of moon , the atmospheric tide and the increase temperature reinforce the vertical instablility of atmosphere. These facts acting on jointly induce sandstorm to give rise to. Significant response of typical strong sandstorm to lunar phase in special areas might provide background for sandstorm forecasting, but also get puzzle of sandstorm prediction into a narrow way.
出处
《干旱区地理》
CSCD
北大核心
2006年第2期201-206,共6页
Arid Land Geography
基金
国家自然科学基金项目(4981008)
关键词
中国北方
典型强沙尘暴
月相
调制
North China
sandstorm
modulation
co-relation analysis
