云南昆洛高速峨山段典型山地雾的诊断分析  

Diagnostic Analysis of Typical Mountainous Fog Process in Eshan along Kunming-Daluo High Way in Yunnan

作　　者：尤红[1] 杨明[2] 郭荣芬[1] 白学文[3] 

机构地区：[1]云南大学大气科学系 [2]云南省气象台 [3]云南省玉溪市气象台

出　　处：《气象》2008年第8期87-94,共8页Meteorological Monthly

基　　金：国家科技攻关计划项目:"云南雾的监测及预报预警"资肋

摘　　要：利用常规观测资料和NCEP1°×1°的逐6小时格点资料，对2005年12月29—31日云南昆洛高速公路峨山段一次典型的强山地雾过程进行天气动力学诊断分析，探讨了本次山地雾形成和维持的机理。结果表明：雾区上空850～800hPa层间存在逆温层或中性层，逆温层越强，山地雾越浓；近地层小于1m·s^-1的微风有利于成雾；分析还指出这次强山地雾发生在久雨转晴和地面强变性冷高压西南侧的天气背景下，地面强辐射冷却效应对山地雾有触发和增强作用，地形背风坡有明显增雾作用。By using the NCEP 1°×1° grid point material and the convention observed data, a heavy fog process in the mountainous region occurred in Kunming-Daluo high way in Yunnan in the end of December 2005 was diagnostically analyzed. The result shows that this fog ever happened at the southwest side of strong cold high pressure of ground in the weather background when the continuous and incessant rain stopped and turned to clear day. The ground radiation cooling effect triggered and strengthened the mountainous region fog, and the topography leeward slope obviously strengthened the effect on the fog of mountain region. When fog formed, 850 800hPa level has an obvious inversion layer or the neutrosphere. The stronger the inversion layer, the heavier the mountainous region fog. The breeze in the surface layer is advantageous in forming the fog.

关 键 词：山地雾 诊断分析 辐射冷却 逆温层 

分 类 号：P432[天文地球—大气科学及气象学] S831.4[农业科学—畜牧学]