摘要
针对华南粤西沿海出现的一次海雾过程,采用现场观测试验获取的数据,结合NCEP再分析数据,分析了此次南海北部海雾的大尺度环流背景、边界层结构以及雾的微物理特征。分析结果表明:这一海雾过程发生在春季西南低涡发展南下的天气背景下,大气底层有明显暖湿气流输送、而高层层结稳定;在西南低涡特殊的天气背景下,白天雾层较浅薄,夜间雾层向上发展;雾的微物理结构与雾层的发展有密切关系,在雾的初始阶段大水滴明显较多,而在雾层向上发展、垂直混合阶段,雾滴有明显的蒸发现象,雾滴具有局地特征。
The large scale synoptic background, boundary layer structure and microphysical characteristics of a sustained sea fog event that occurred in the north part of the South China Sea are analyzed by using field observation and NCEP re-analysis data. The results show that this sea fog event is accompanied by a southwest vortex that develops and moves to the south, when a warm and humid air flow continuously transports into the South China Sea with stable stratification in high level. Under such special synoptic situation, the fog is thinner in the daytime than in the nighttime. Fog microphysics structure is closely related to fog development, and fog droplets are much larger in the initial stage. During the period of upward development and vertical mixing of fog, fog droplets have local features and begin evaporating.
出处
《热带气象学报》
CSCD
北大核心
2008年第5期490-496,共7页
Journal of Tropical Meteorology
基金
国家自然科学基金项目(40675013)
中国气象局新技术推广项目(华南沿海海雾预报方法研究及系统开发)
广东省科技计划项目(2006B37202005)共同资助
关键词
海雾
边界层结构
微物理结构
sea fog
boundary structure
microphysical structure
