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2007年12月下旬,河北省中南部平原地区的日光温室蔬菜大面积受灾,损失惨重。灾情发生的主要气象环境因素为:长期高湿、寡照、低温,系高空平直西风环流不利于较强冷空气南下和地面冷高压东南部弱冷空气不断扩散的稳定形势下形成持续大雾天气所致。大雾前期低层偏南气流持续输送水汽、水汽通量的连续辐合、低层切变过境为持续大雾天气的形成创造了有利的低层湿度条件,逆温层的形成与维持为持续大雾天气的产生创造了有利的层结条件,夜间偏北微风少云的天气利于雾滴的形成,而强冷空气的入侵是持续大雾天气结束的主要原因。提出了持续大雾天气预报的着眼点及日光温室蔬菜的防灾措施。
In late December 2007, a large area of greenhouse vegetables in the central-southern plains of Hebei Province suffered a large loss and suffered heavy losses. The main meteorological environmental factors of the disaster are as follows: long-term high humidity, low light, low temperature, high altitude straight westerly circulation is not conducive to strong cold air south and the ground cold high pressure southeast weak air continues to spread the steady situation of the formation of continuous foggy weather Due. In the early stage of the heavy fog, continuous flow of water vapor and water vapor flux continued from the lower part of the south-facing airstream and the low-level shear transition created favorable low-level humidity conditions for the formation of a continuous heavy foggy weather. The formation and maintenance of the inversion layer continued to be a foggy weather The formation of favorable stratification conditions, the night breeze breeze weather is conducive to the formation of droplet, and strong cold air intrusion is the main reason for the end of the foggy weather. Put forward the focus of continuous fog forecast weather and solar greenhouse vegetable disaster prevention measures.