2021年涠洲岛4次海雾外场观测数据分析

Analysis of four outfield observation data of sea fog on Weizhou Island in 2021

利用2021年2—4月广西涠洲岛雾滴谱仪得到的海雾综合观测资料,对涠洲岛海雾的总体特征及典型个例进行了分析。结果表明:(1)涠洲岛海雾持续时间较短,平均为1.1h,海雾过程中地表维持较高湿度,平均风速不大于3m·s^(-1),地面以偏北、偏东风为主;涠洲岛海雾的平均雾滴数浓度为79.5cm^(-3),平均液态含水量为0.01g·m^(-3),平均直径为4.3μm。(2)2021年2月28日涠洲岛海雾微结构特征:能见度与雾滴数浓度和液态含水量的变化趋势相反,海雾发展越旺盛,能见度越低,微物理参量越大;海雾的雾滴谱分布呈单调递减特征,符合Junge分布。

Using comprehensive observation data of sea fog obtained by fog droplet spectrometer on Weizhou Island in Guangxi from February to April 2021,the general characteristics and typical cases of sea fog on Weizhou Island were studied.Results show that the duration of sea fog on Weizhou Island is short,with an average of 1.1h.During the fog events,the humidity is relatively high,the average wind speed is not greater than 3m·s^(-1),and the ground is dominated by northerly and easterly winds..The average number of fog droplets number concentration(N),liquid water content(LWC),and average radius is 79.5cm^(-3),0.01g·m^(-3),and 4.3μm,respectively.In a typical case on 28 February,2021,the change trend of visibility was opposite to N and LWC.The more vigorous the development of sea fog,the lower the visibility and the larger the microphysical parameters.The droplet spectral distribution is monotonically decreasing,which conforms to the Junge distribution.