2013年11月30日—12月9日，江苏出现持续10 d 的强浓雾天气。利用秒级探空资料、能见度资料、江苏省高速公路沿线高时空密度的交通气象观测站资料以及 NCEP／NCAR 的1°×1°的分析资料，结合天气形势、气象要素、物理量场，对这次持续性强浓雾的特点和形成、维持机制进行分析。结果表明，（1）此次雾过程持续时间长、范围广、强度大、污染重。（2）在大陆高压控制下，江苏长时间处于高压带的均压区内是这次连续性强浓雾过程的重要天气条件。（3）地面辐射冷却、低空下沉气流以及东南暖湿气流是强浓雾形成的重要原因。（4）双层逆温和深厚的逆温层是出现强浓雾的重要热力条件。（5）弱冷空气入侵，是雾体爆发增强的促发因子。
A discussion on the reason for a rare persistent heavy fog event in Jiangsu Province
Using the atmospheric boundary layer gradient observations,the second level radiosonde data,visibility observa-tions,high temporal and spatial density of meteorological observation data along the highway,and NECP 1°×1°reanalysis da-ta,the formation and maintenance mechanism for the persistent heavy fog during 31 November to 9 December 2013 are ana-lyzed.The results show that the process is characterized by long duration,wide range,and low visibility with high concentra-tions of pollutants.Analysis of the synoptic weather pattern shows that Jiangsu province was under the control of continental high pressure,which sustained there for a long time.The fog occurred over the uniform and high pressure zone.Apparently such a synoptic pattern provides an important condition for the formation and continuance of the fog.Surface layer inversion, low-level downdraft and southeasterly flow of warm and wet air are also important reasons for the formation of this heavy fog. The double inversion layers with a large depth provide important thermal conditions favorable for the formation of heavy fog, while the intrusion of weak cold airmass directly triggered the outbreak and intensification of the fog.
国家科技期刊平台
NSTL
万方数据
维普
