次级环流在两次辽宁沿海大风过程中的作用分析

环黄渤海地区经济发展迅速，同时灾害性天气频发，灾害性大风天气对于沿海地区的交通运输、渔业等造成了严重的影响。所以，提高沿海大风的预报能力，对于减少或避免经济损失和人员伤亡具有非常重要的意义。通过分析2012年8月28日（台风“布拉万”）和2009年2月13日辽宁沿海地区两次大风天气过程中次级环流的作用，发现：（1）急流次级环流下沉支所在区域是地面大风加强的区域，为预报大风落区提供了理论依据；（2）垂直速度引发的动力次级环流的强弱变化对地面大风的强弱变化有明显的指示作用；大风过程中的成对的垂直速度中心的阶梯状分布有利于高空动量下传，对地面大风有促进作用；（3）热力次级环流对地面大风也有一定的影响，但是不能对大风的形成起到决定性作用。

The Effect of Secondary Circulation on Two Coastal Windy Weather Processes in Liaoning

With the rapid economic development of central yellow sea region，severe weather occurs frequently and have serious influence on transportation, fishery, etc. So, it is of significant importance to improve the forecast ability of coastal winds, and reduce or avoid economic losses and casualties. Through the analysis of secondary circulation of two windy weather processes on August 28, 2012 (Typhoon bolaven) and February 13, 2009, in coastal region of Liaoning, the authors found: (1) jet secondary circulation subsidence area was ground winds strengthen region, providing a theoretical basis for forecasting strong wind; (2)intensity variation of dynamic secondary circulation caused by the vertical velocity had an obvious indication role on the intensity change of surface gale, ladder like distribution of vertical velocity center in pairs in the process of the wind benefited the downward transport of momentum and had a promoting effect on surface wind; (3)thermal secondary circulation also had certain effect on the ground gale, but not a decisive role in the formation of the wind.