内蒙古中西部地面感热通量影响沙尘暴的观测分析

利用内蒙古中西部不同地表类型的16个测站2005—2006年3—5月逐小时地面观测资料和逐日沙尘暴资料,计算了地面感热通量、地面位温并分析它们与沙尘暴的关系,结果发现:在内蒙古中西部春季地面感热通量表现为净加热,且沙尘暴发生次数多的年份净地面感热加热强度反而较小。在沙尘暴发生前,沙漠区和高平原区地面感热通量达到最大,而丘陵和平原地区反而开始降低。对于沙尘暴发生前12 h累积的地面感热加热强度及导致的地面位温上升幅度,高平原和丘陵平原区要强于沙漠区。但相对而言,沙漠和高平原地区地面感热加热影响沙尘暴的“效率”更高。

Observational Analysis on Relationship between Surface Sensible Heating Flux and Dust Storm in Midwestern Inner Mongolia

Based on the hour-to-hour surface observational data and day-to-day dust storm data in midwestern Inner Mongolia from Mar. to May in 2005 and 2006, the surface sensitive heating flux and surface potential temperature were calculated and the relationship between them and dust storm was analyzed. The results show that a net surface heating appears at the midwestern part of Inner Mongolia in Spring; The surface sensitive heating flux is smaller in dust storm occurring years. Before dust storm occurrence the surface sensitive heating flux in high plain areas and desert areas reached the maximum while that in hill and plain areas began to decrease. The accumulative surface sensitive heating flux in high plain areas and hill areas is larger than that in desert areas. But the influence of surface sensitive heating flux on the dust storm in desert areas and high plain areas is more efficient than that in hill areas.