海洋气象条件变化对青岛平流雾过程的影响分析

Analysis on Impact of Marine Meteorology Condition on One Advection Sea Fog in Qingdao

利用风廓线资料、探空资料和地面气象观测资料对青岛夏季的一次平流雾过程进行了分析,探讨了雾的演变与气象条件的关系。研究表明：雾的强度和厚度与风的垂直结构密切相关,风向为稳定的东南风,90%以上的相对湿度层有一定厚度时,3 m/s以内的风速层内容易成雾,雾顶高度在240~530 m之间。雾顶可以在逆温层底,也可能低于逆温层底。逆温层抬升有利于雾层向上发展,突破混合层高度。稳定的向岸风有利于海风的形成,造成比湿持续增加和大气中粗粒子增多,能见度下降和雾的出现。

One advection sea fog happened in Qingdao summer was analyzed to investigate the relation- ship between the meteorology condition and the fog evolution. Data obtained by wind profiler radar, ra- diosonde and surface based meteorology instruments were used for the analysis. It was shown that the strength and depth of the fog were highly dependent on the vertical structure of the wind. When the pre- vailing wind was steady southeastly and there was deep layer of the relative humidity larger than 90~, the fog was easily developed in the layer with wind speed less than 3 m/s. The fog top layer might be at 240 m to 530 m altitude, which might be at or lower than the base of the inversion layer. If the inversion layer was rised, the fog will develop upward and breaks through the mixed layer. Steady on shore wind was fa- vorable to the development of sea breeze, made the increase of the specific humidity and coarse mode aerosol particulates, resulted the decrease of the visibility and the formation of sea fog.