Acta Scientiarum Naturalium Universitatis Pekinensis ›› 2019, Vol. 55 ›› Issue (5): 899-906.DOI: 10.13209/j.0479-8023.2019.056

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Meteorological Characteristics of Prolong Low-Visibility Events in Haikou during February 2018

YAN Yan, MIAO Yucong†, LI Jian, GUO Jianping   

  1. State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081
  • Received:2018-10-08 Revised:2019-05-01 Online:2019-09-20 Published:2019-09-20
  • Contact: MIAO Yucong, E-mail: miaoyucong(at)yeah.net

海口地区2018年2月持续低能见度过程的气象条件分析

艳艳, 缪育聪†, 李建, 郭建平   

  1. 中国气象科学研究院灾害天气国家重点实验室, 北京 100081
  • 通讯作者: 缪育聪, E-mail: miaoyucong(at)yeah.net
  • 基金资助:
    国家重点研发计划(2017YFA0603501, 2017YFC1501701)、国家自然科学基金(41705002, 41771399, 41875181)和中国气象科学研究院基本科研业务费专项基金(2017Y002, 2017Z005)资助

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Abstract:

To understand the meteorological characteristics associated with the prolong low-visibility events occurring in Haikou and Qiongzhou Strait during February 2018, we systematically analyzed the visibility data, surface meteorological observations, sounding data and reanalysis data. It’s found that the low-visibility events in winter in Haikou typically occurred under relatively warmer and moister conditions. In winter, the visibility of Haikou was significantly anti-correlated with relative humidity, temperature and thermal stability, and was significantly correlated with wind speed and boundary layer height. No significant correlation was found between visibility and PM2.5 concentration. At the 925 hPa level, when Haikou was located to the south of high-pressure system, good visibility could be observed associated with the northeasterly winds; in contrast, when Haikou was controlled by the southeasterly winds, the warm and moisture air mass could be brought to Haikou, favoring the occurrence of low-visibility events.

Key words: Haikou, low-visibility, synoptic patterns, planetary boundary layer

摘要：

利用海口地区的能见度资料、地表气象观测、探空数据和再分析资料, 对2018年2月发生在海口和琼州海峡地区的持续低能见度过程的气象学成因进行分析。结果表明, 海口地区冬季的低能见度事件通常出现在暖湿条件下; 能见度与相对湿度、温度和热力稳定度呈显著的负相关关系, 与风速和边界层高度呈显著的正相关关系。海口地区空气质量良好, 其能见度与PM2.5浓度间无显著的相关性, 这一特点与我国其他污染较重的地区有所不同。在925 hPa 高度上, 当海口处于高压系统的南侧, 受到东北风控制时, 能见度状况较好; 当受东南风控制时, 来自海上的暖湿气流有利于低能见度事件的出现和维持。

关键词: 海口, 低能见度, 环流场, 大气边界层

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