祖繁,袁成松,吴泓,王宏斌,朱毓颖,朱承瑛. 2020. 江苏北部不同等级雾的微物理结构及个例分析[J]. 气象学报, (0):-, doi:10.11676/qxxb2020.040
江苏北部不同等级雾的微物理结构及个例分析
Microphysical structure of fog droplets at different fog grades and a case study in northern Jiangsu Province
投稿时间:2019-07-22  修订日期:2020-01-09
DOI:10.11676/qxxb2020.040
中文关键词:  能见度,雾等级,微物理结构,物理过程,江苏北部
英文关键词:Visibility, Fog grades, Microphysical structure, Physical process, Northern Jiangsu
基金项目:国家自然科学基金项目(41575135),江苏省重点研发计划(社会发展)项目(BE2016810),江苏省自然科学基金项目(BK20161073),江苏省气象局北极阁基金项目(BJG201701、BJG201703、BJG201606)
作者单位E-mail
祖繁 中国气象局交通气象重点开放实验室
江苏省气象科学研究所 
zufan123@yeah.net 
袁成松 中国气象局交通气象重点开放实验室
江苏省气象科学研究所 
jsnjycs@vip.sina.com 
吴泓 中国气象局交通气象重点开放实验室
江苏省气象科学研究所 
Wu58238@163.com 
王宏斌 中国气象局交通气象重点开放实验室
江苏省气象科学研究所 
kaihren@163.com 
朱毓颖 中国气象局交通气象重点开放实验室
江苏省气象科学研究所 
yyzhu1985@126.com 
朱承瑛 中国气象局交通气象重点开放实验室
江苏省气象科学研究所 
cathyzhu6@qq.com 
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中文摘要:
      [资料]利用2015年秋季、2016年冬季在江苏北部观测到12次雾过程的雾滴谱仪数据及常规气象资料,[目的]统计分析了轻雾、大雾、浓雾、强浓雾和特强浓雾等级下的微物理特征量及雾滴谱分布,并通过一次雾过程的分析,探讨了不同雾等级下的主要微物理过程。[结果和结论]结果表明:随着雾等级的提升,雾滴数浓度、含水量增长明显,而轻雾、大雾和浓雾的平均直径和最大直径差异不大,但当能见度小于200 m时,平均直径和最大直径显著提升;能见度下降时,平均数浓度谱和含水量谱的谱型均产生抬升现象,从浓雾到强浓雾,粒径大于10 μm的大雾滴增长明显;雾滴数浓度主要由小雾滴控制,雾滴含水量受大雾滴影响;东海县郊的雾滴平均含水量与南京观测结果相差不大,但雾滴数浓度仅为南京的一半左右,平均直径大约是南京的2.3倍;个例分析中,能见度从1000 m下降到50 m,液滴活化并凝结增长是主要微物理过程,但可凝结水汽是影响该过程效果的一个重要因子,可使雾滴数浓度和平均直径呈现不同的相关性;能见度降到50 m以下时,碰并过程效果显著;日出后雾滴蒸发退活化作用显现并逐步增强。
英文摘要:
      Using the fog droplet spectrometer data and conventional meteorological elements of 12 fog events observed in northern Jiangsu Province during the fall of 2015 and the winter of 2016, the microphysical characteristics and fog droplet spectra were analyzed in the grades of light fog, fog, heavy fog, dense fog and extremely dense fog. Subsequently, the dominant microphysical processes during different fog grades were discussed by the analysis of a long-lasting fog case. The results indicate that the droplet concentration and liquid water content increase significantly with the enhancement of fog grades, while the mean diameter and maximum diameter are similar during light fog, fog and heavy fog until the visibility decrease below 200 m, after which mean diameter and maximum diameter show an obvious improvement. When the visibility is degraded, the average droplet spectra of number concentration and liquid water content are both uplifted, and the big droplets with diameter greater than 10 μm grow notably from heavy fog to dense fog. The number concentration of fog droplets is mainly controlled by small droplets, and the liquid water content is affected by large droplets. The average liquid water content of fog droplets in Donghai County suburb is comparable to that in Nanjing, but the number concentration is only about half of Nanjing and the mean diameter is about 2.3 times of Nanjing. In the case study, droplet activation with subsequent condensational growth is the dominant microphysical process during the period of visibility decreasing from 1000 m to 50 m, however, the condensable water vapor is an important factor affecting the effect of the process, which can make the number concentration and the mean diameter show different correlations. When the visibility drops below 50 m, the effect of collision–coalescence process is remarkable, but after sunrise, droplet deactivation via evaporation appears and gradually reinforces.
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