【摘要】 基于沙尘数值预报模式针对不同区域地面起沙的敏感性试验结果,分析讨论了蒙古气旋沙尘暴过程中沙尘传输的特点及形成原因。结果表明:蒙古气旋沙尘暴过程的沙尘传输表现为:沙源区纬度越高,沙尘向东传输越强,纬度越低,向南传输越强;同时,高度越高,沙尘向东传输越强,高度越低,向南传输越强。其形成原因是萨彦岭山地背风坡效应、青藏高原东北侧地形强迫绕流等自然地理因素和蒙古气旋的动力、热力结构共同造成的,具有一定程度的普遍性。更多还原

【Abstract】 By using the output data of numerical simulation based on a dusty weather numerical prediction model and sensitive test about the surface dust rising coefficient at different areas,the dust transportation characteristics and its formation causes in the dusty weather process induced by Mongolia cyclone were analyzed.The result showed that in the process the dust particles eastward transportation enhanced while the latitude of the dust resource area increased.Contrariwise,the southward transportation enhanced.Meanwhile,the eastward transportation enhanced while the altitude of dust particles increased.Contrariwise,the southward transportation enhanced.This phenomenon is caused by collective effect of the Sayan mountain’s lee affection,the air stream forced by the Qinghai-Tibet plateau north-eastern boundary and the dynamic and thermodynamic structure of Mongolia cyclone.Most of these elements are natural and so these results are universal.更多还原