摘要
利用常规气象观测资料和NCEP 1°×1°的再分析资料,对2009年12月1—2日南京地区一次浓雾天气过程产生的大尺度天气背景、气象要素及各种物理量进行分析,结果表明:高空弱脊和地面弱高压的控制有效抑制对流的发展,为这次浓雾的形成提供有利的环流形势;地面弱冷空气的影响,低层弱的辐合上升及中高层下沉增温作用,促使多层逆温存在,为雾的形成提供有利的层结条件;前期降水条件、近地层偏东风场及暖干盖作用为雾的形成提供了丰富的水汽条件;另外污染物集聚,也为雾的形成提供了丰富的凝结核。
Large-scale weather background,meteorological factors and various physical quantity of a dense fog event occurred in Nanjing on 1-2 Dec 2009 were analyzed by using routine observation and NCEP 1°×1° re-analysis data.The results showed that a weak high ridge at the high level and surface weak high pressure inhibited the development of convection and provided a good condition for the formation of fog.The impact of weak surface cold air,weak convergence at lower level and subsidence flow at the middle and high levels led to multi-layer inversion,and provided favorable stratification for the formation of fog.The presence of pre-precipitation,easterly winds near ground field as well as the role of warm-dry cover provided the water vapor for the fog event.In addition,the concentration of pollutants also provided plenty of nuclei for the formation of fog.
出处
《气象科学》
CSCD
北大核心
2012年第1期94-100,共7页
Journal of the Meteorological Sciences
基金
国家自然科学基金资助项目(40975085)
江苏省重大科技支撑与自主创新示范工程项目(BE2008618)
中国气象局气象关键技术集成与应用面上项目(CAMGJ2012M20)
关键词
平流雾
环流背景
物理量
Advection fog
Circulation background
Physical quantity
Nanjing
