Journal of Arid Meteorology

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Aerosols Characteristics Beneath the Clouds Based on Airborne Observation in Early Summer over Sichuan Basin

WANG Weijia1,2, GUO Xueliang2,3, LI Hongyu3, DONG Xiaobo4   

  1. 1.Sichuan Meteorological Disaster Prevention Technology Center, Chengdu 610072, China;
    2. Key Laboratory for Cloud Physics of China Meteorological Administration, Beijing 100081, China;
    3. Weather Modification Center, CMA, Beijing 100081, China;
    4. Weather Modification Office of Hebei Province, Shijiazhuang 050021, China
  • Online:2018-04-30 Published:2018-04-30

基于飞机观测的四川盆地初夏云下气溶胶特征

王维佳1,2郭学良2,3李宏宇3董晓波4   

  1. 1. 四川省气象灾害防御技术中心,四川 成都 610072;
    2. 中国气象局云雾物理环境重点实验室,北京 100081;
    3. 中国气象局人工影响天气中心,北京 100081;
    4. 河北省人工影响天气办公室,河北 石家庄 050021
  • 作者简介:王维佳(1980— ),女,高级工程师,从事大气环境研究与灾害评估业务. E-mail:wjwang999@sohu.com。
  • 基金资助:

    中国气象局云雾物理环境重点实验室开放课题(2017Z01610)、公益性行业(气象)科研专项(GYHY201406032)共同资助

Abstract:

With the purpose of studying the clouds and aerosols over Sichuan Basin, two observation experiments were performed with the PMS probes mounted on a Cheyenne ⅢA aircraft on June 23, 2009.  Based on the in-situ airborne observation data, CERES SYN1deg-3Hour Ed3A data, aerosols optical depth of MODIS and backward and forward trajectories simulated by HYSPLIT model, the vertical distribution, size spectrum distribution and source of aerosols beneath the clouds over Sichuan Basin were analyzed. The results show that the number concentration magnitude of atmospheric aerosol particles observed by the airborne over cities of Sichuan Basin was 108 to 109 m-3, which was identical to the number concentration magnitude of aerosol particles over greatly polluted cities of Hebei Province, Beijing and its surrounding areas. The aerosols over Sichuan Basin were impacted mostly by the regional pollutants, while the long-distance transportation had a little contribution to aerosol particles over Sichuan Basin.  After the generation, the aerosol particles concentrated mainly over Sichuan Basin, which intensified the regional air pollution.  On overcast days of early summer, the atmospheric aerosols were mainly below 2 800 meters AMSL over Sichuan Basin.  The aerosol particles were nearer to the ground, and the number concentration was higher. In additional, the aerosol particles beneath the clouds were majorly accumulation mode, and Angstrm exponents of aerosol particles were 1.2 to 1.4, which obviously demonstrated the urban-industry aerosol characteristics.

Key words: aerosol, size spectrum distribution, airborne observation, Sichuan Basin

摘要:

利用2009年6月23日夏延飞机搭载的云粒子测量系统(PMS)对四川盆地上空云和气溶胶的2次观测试验资料和MODIS光学厚度产品及云和辐射资料(CERES SYN1deg-3Hour Ed3A),结合HYSPLIT模式模拟的气团后向轨迹和前向轨迹,分析四川盆地云下气溶胶数浓度垂直分布、谱分布和来源特征。结果表明:飞机观测的四川盆地大气气溶胶数浓度量级为108~109 m-3,与河北省、北京及周边城市飞机观测的气溶胶数浓度量级相同,污染较重。远距离输送对四川盆地气溶胶贡献小,说明气溶胶主要受盆地区域内污染物影响,同时气溶胶生成后主要在盆地区域内聚集,使得区域内空气污染居高不下。初夏阴天天气条件下,四川盆地的大气气溶胶主要分布在2 800 m以下,气溶胶粒子数浓度越靠近地面越大,且云下气溶胶粒子较多是积聚模态,粒子Angstrm波长指数介于1.2~1.4之间,城市-工业气溶胶的特征明显。

关键词: 气溶胶, 谱分布, 飞机观测, 四川盆地

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