研究报告

  • 张一炜,赵天良,胡未央,白永清,段婧,陆春松.两湖盆地襄阳地区PM2.5重污染过程区域传输的观测和模拟分析[J].环境科学学报,2022,42(11):318-329

  • 两湖盆地襄阳地区PM2.5重污染过程区域传输的观测和模拟分析
  • Observation and simulation analysis of regional PM2.5 transport in heavy air pollution process in Xiangyang Area over the Twain-Hu Basin
  • 基金项目:国家自然科学基金(No.42075186, 41830965, 91744209)
  • 作者
  • 单位
  • 张一炜
  • 南京信息工程大学,中国气象局气溶胶-云-降水重点开放实验室,气象灾害预报预警与评估协同创新中心,南京 210044
  • 赵天良
  • 南京信息工程大学,中国气象局气溶胶-云-降水重点开放实验室,气象灾害预报预警与评估协同创新中心,南京 210044
  • 胡未央
  • 南京大学环境学院,污染控制与资源化研究国家重点实验室,南京 210023
  • 白永清
  • 中国气象局武汉暴雨所,武汉 430205
  • 段婧
  • 中国气象局人工影响天气中心,北京 100081
  • 陆春松
  • 南京信息工程大学,中国气象局气溶胶-云-降水重点开放实验室,气象灾害预报预警与评估协同创新中心,南京 210044
  • 摘要:两湖盆地位于华中地区,横跨湖北、湖南两省,海拔高度低于200 m.襄阳为华中地区两湖盆地的“风口”,PM2.5污染严重.为认识襄阳地区大气环境变化特征,对其2016年1月的大气污染过程进行研究分析,研究气象条件对PM2.5浓度的影响.结果表明:冷空气南下入侵对两湖盆地襄阳地区产生PM2.5重污染有重要驱动作用.强风是驱动大气污染物区域传输的主要因素,受东亚冬季风影响,上风方的PM2.5跨区域传输到下风方两湖盆地,导致襄阳地区的PM2.5污染水平上升.基于FLEXPART-WRF模式,定量估算了2016年1月襄阳地区4次PM2.5重污染过程的区域传输贡献,估算发现4次大气重污染过程的外源贡献率均高于50.0%,最高达80.3%,体现了大气污染物区域传输对两湖盆地大气重污染事件的主导作用.两湖盆地襄阳地区PM2.5污染主要潜在源来自东北路径,以华北平原为主.
  • Abstract:The Twain-Hu basin (THB) is located in Central China, covering the lowland (mainly less than 200 m a. s. l.) acorss Hubei and Hunan provinces. Xiangyang is the "tuyere" in the northwestern mouth of THB in Central China with serious PM2.5 pollution. In order to understand the variations of atmospheric environment in Xiangyang, the PM2.5 pollution processes in January 2016 were analyzed to explore the effects of meteorological conditions on PM2.5 concentrations. The results showed that the southward cold air mass droven regional transport of PM2.5 from upwind regions to the THB. Strong wind is the main factor in driving the regional transport of air pollutants. Governed by the East Asian winter monsoon, PM2.5 emitted from the upstream regions was transported to the downwind areas (Xiangyang), leading to the rising PM2.5 concentrations in Xiangyang. Based on the FLEXPART-WRF model, we quantitatively estimated the contribution of regional PM2.5 transport to four heavy PM2.5 pollution processes over Xiangyang in January 2016. The contribution rates of four heavy PM2.5 pollution events all exceeded 50.0%, with maximum contribution of 80.3%, indicating the leading role of regional PM2.5 transport in worsening air quality of the THB. The main sources of PM2.5 pollutant in Xianguyang, the THB were from the northeasterly direction, mainly the North China Plain.

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