辐射雾微结构精细化观测研究

High-resolution observation of radiation fog microstructure

为研究FM-120雾滴谱仪不同采样频率(5 Hz、1 Hz)对辐射雾微结构观测的影响,2020年冬季在连云港东海县开展了为期58 d的雾外场精细化观测。在2020年12月28日一次辐射雾过程中使用5 Hz和1 Hz两台不同频率的雾滴谱仪开展辐射雾精细化观测研究。研究发现,相较于1 Hz的观测结果,5 Hz更容易观测到雾的微物理量的极值。从整个雾过程来看,5 Hz雾滴谱仪平均成1 Hz后的结果在雾的形成和消散阶段与1 Hz雾滴谱仪的原始结果的相似度较低,但在雾的成熟和发展阶段相似度较高。从谱型来看,5 Hz和1 Hz观测到的谱型基本类似,主要差别出现在峰值。5 Hz和1 Hz均能反映此次雾过程中不同阶段微物理之间的关系,主要差别出现在雾的形成阶段,这可能是5 Hz在此阶段观测到的活化并凝结增长的新雾滴相对较少所导致。

To study the differences and similarities between high-resolution and conventional observations of fog microstructure,we conducted an extensive 58-day field observation of fog during the winter of 2020 in Donghai,Lianyungang.Two fog monitors operating at different frequencies(5 Hz and 1 Hz)were employed simultaneously to measure radiation fog on December 28,2020.Our observations revealed that the 5 Hz measurements exhibited a greater range of extreme values compared to the 1 Hz data.Over the entire fog process,the 5 Hz fog droplet spectrometer measurements,when averaged to 1 Hz,demonstrated less similarity to the original 1 Hz results during the fog s generation and dissipation stages,while showing more similarity during the maturation and development stages.Concerning spectral patterns,both 5 Hz and 1 Hz measurements exhibited similarities,with notable differences occurring at the peaks.Both 5 Hz and 1 Hz measurements effectively depicted the relationship between microphysics at different stages of the fog process,with primary differences emerging during the fog generation stage.This divergence may be attributed to the relatively limited activation and condensation growth of new fog droplets observed by the 5 Hz instrument during this stage.