一次高压型海雾中的液态含水量演变特征  

EVOLUTION CHARACTERISTICS OF LIQUID WATER CONTENT FOR A HIGH-PRESSURE PATTERN OF SEA FOG

作　　者：李晓娜[1,2] 黄健[2] 申双和[1] 刘寿东[1] 吕卫华 

机构地区：[1]南京信息工程大学应用气象学院,江苏南京210044 [2]中国气象局广州热带海洋气象研究所,广东广州510080 [3]茂名市气象局,广东茂名525000

出　　处：《热带气象学报》2010年第1期79-85,共7页Journal of Tropical Meteorology

基　　金：国家自然科学基金资助项目(40675013);中国气象局新技术推广项目(CMATG2007M23);广东省科技厅计划项目(2006B36702005)共同资助

摘　　要：2008年3月16—17日在粤西电白出现了一次在高压天气系统控制下的海雾过程。利用这次海雾的综合观测数据,分析了这一高压型海雾的液态含水量演变特征,讨论了液态含水量与雾滴平均直径和数密度以及气温、风速、湍流交换等的关系。结果显示:(1)海雾有发展-消散-再发展的准周期性变化特征;(2)海雾过程中的雾滴数有显著的变化,而雾滴平均直径的变化较小;雾滴数变化对海雾的发展、消散起主要作用;(3)在海雾生成和发展阶段,空气的冷却机制起主要作用;而在海雾的维持阶段冷却机制的作用并不明显;(4)在雾的生成阶段,弱湍流交换有利于雾的生成;而在雾的发展和维持阶段,湍流交换减弱,液态水增长,反之液态水减少。湍流交换的强、弱与海雾发展-消散-再发展的周期性变化有密切关系。Between 16^th and 17^th of March this year, an event of sea fog occurred in Dianbai in the west of Guangdong, under the control of a high-pressure synoptic system. Comprehensive observation data were used to analyze the evolution of liquid water content characteristics of this high-pressure pattern of sea fog and discuss the relationship between LWC and the average diameter and number density of fog droplets, air temperature, wind speed and turbulent exchange. The results have the following indication. （1） The sea fog event shows a quasi-periodic process in which it developed, disappeared and then developed again. （2） During the sea fog process the count of fog droplets changed significantly while the average diameter of fog droplets changed little. The development and disappearance of the sea fog was seriously affected by fog droplet count. （3） The cooling-down mechanism of air played a significant role in the forming and developing stages. However, the effect of this mechanism was insignificant in the persisting stage. （4） In the forming stage of the sea fog, weak turbulent exchange helped it form; in the developing and persisting stages LWC increased when the turbulent exchange diminished, and on the contrary, LWC decreased. There is a close relationship between the level of turbulent exchange and oscillatory change of the sea fog.

关 键 词：高压型海雾 液态含水量 雾滴数密度 雾滴平均直径 湍流交换 

分 类 号：X16[环境科学与工程—环境科学]