渤海湾一次罕见持续性海雾过程的成因分析

发布时间：2018-06-07 13:32

本文选题：渤海湾 + 海雾　；参考：《环境科学与技术》2017年04期

【摘要】：利用常规气象观测资料、NCEP/NCAR日平均再分析资料、NCEP提供的FNL客观分析资料以及NOAA提供的最优海温插值资料,诊断分析了2013年1月27-31日渤海湾罕见持续性海雾的成因。结果表明:这次罕见海雾发生在中纬度高空暖性高压脊、大气层结稳定的气象背景下。渤海湾位于中国东部海域高压后部,有利于低纬度暖湿水汽向渤海湾输送和汇合,为海雾的形成、发展提供有利水汽条件。低空西南急流迅速发展,近海面层大气湍流发展加强,渤海湾位于急流左侧的辐合气流中,导致大量水汽和暖湿平流往渤海湾输送、聚集,渤海湾海气温差出现明显的由正向负转折,由平流蒸发雾转为冷却雾,边界层内逆温发展加强且逆温层高度增高,上述因素是海雾发展加强和长时间维持的重要原因。31日白天水汽通量、温度平流、水汽辐合及垂直运动的空间配置达到最好,特强浓雾天气因而形成。
[Abstract]:Based on the FNL objective analysis data provided by NCEP / NCAR daily average reanalysis data and the optimal SST interpolation data provided by NOAA, the causes of rare persistent sea fog in Bohai Bay from January 27-31, 2013 are diagnosed and analyzed by using conventional meteorological observation data and NCEP / NCAR daily average reanalysis data. The results show that the rare sea fog occurred in the mid-latitude warm ridge with stable atmospheric stratification. The Bohai Bay is located at the back of the high pressure in eastern China, which is favorable for the transport and confluence of warm and wet water vapor from low latitude to the Bohai Bay, which provides favorable water vapor conditions for the formation and development of sea fog. With the rapid development of the southwest jet stream at low altitude and the enhancement of atmospheric turbulence in the offshore surface layer, the Bohai Bay is located in the convergent airflow on the left side of the jet stream, resulting in a large amount of water vapor and warm and wet advection being transported and accumulated into the Bohai Bay. The temperature difference between sea and air in the Bohai Bay has changed from positive to negative, from advection evaporative fog to cooling fog. The development of inversion temperature in the boundary layer has been strengthened and the height of the inversion layer has been increased. The above factors are the important reasons for the development of sea fog to strengthen and maintain for a long time. The spatial configuration of water vapor flux, temperature advection, water vapor convergence and vertical motion is the best on the 31st day, resulting in the formation of extremely strong fog weather.
【作者单位】：天津市气象台;天津市气象服务中心;
【基金】：天津市科技兴海项目(KJXH2014-20) 天津市科技计划项目(15ZCZDSF00210) 中国气象局预报预测核心业务发展专项(CMAHX20160204)
【分类号】：P732

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