林楠,蒋荣复,何宇晖,任赛赛,庄小阳.莆田地区一次臭氧污染过程分析[J].环境科学学报,2021,41(7):2569-2576
莆田地区一次臭氧污染过程分析
- A case study of ozone pollution in Putian
- 基金项目：国家自然科学基金（No.U1405235）；华东区域气象科技协同创新基金项目（No.QYHZ201813）；福建省气象局开放式研究基金（No.2019KX04）
- 林楠
- 1. 秀屿区气象局, 莆田 351100;2. 福建省灾害天气重点实验室, 福州 350001
- 任赛赛
- 1. 莆田市气象局, 莆田 351100;2. 福建省灾害天气重点实验室, 福州 350001
- 摘要：利用2018年7月28日—8月5日莆田地区4个环境监测站臭氧逐小时浓度观测资料、莆田国家气象站逐小时资料、莆田地区风廓线雷达站逐小时资料对7月29日—8月4日的臭氧污染过程进行分析.结果表明，除7月30日臭氧最大浓度为193 μg·m-3外，其余日期莆田市监测站的臭氧浓度小时最大值均超过200 μg·m-3.本次污染过程在气象条件上臭氧浓度与温度呈正相关，与湿度呈负相关，臭氧浓度与两者的相关系数绝对值均大于0.77.边界层上的偏西风和西南风在此次过程中表现出有利于本地区臭氧污染的形成和维持.结合污染物排放资料和后向轨迹分析表明，污染主要成因以外来源输送为主，后向轨迹经过漳州、泉州排放区，本地区排放对污染的贡献较少.莆田市监测站的NOx与O3浓度呈正相关的特殊现象是海陆风和山谷风配合地形造成的O3和NOx共同堆积和扩散所导致的.
- Abstract：This paper analyzes the ozone pollution process between July 29th and August 4th by using the hourly ozone concentration observation data of four environmental monitoring stations in Putian, hourly data from the Putian National Meteorological Station, and hourly wind profiles of the Putian radar station from July 28 to August 5, 2018. Except for the maximum ozone concentration of 193 μg·m-3 on July 30th, the hourly maximum ozone concentration of the Putian monitoring station in the remaining days exceeded 200 μg·m-3. The ozone concentration is positively correlated with temperature and negatively correlated with humidity. The absolute value of the correlation coefficient between ozone concentration and temperature (humidity) is greater than 0.77 (0.77). Westerly and southwesterly winds in the planet boundary layer helped form and maintain ozone pollution in the region during this process. Combined with pollutant emission data and backward trajectory analysis, transmitted pollution from other areas is the main cause of pollution in this study; the backward trajectory of pollution passes through the Zhangzhou and Quanzhou emission areas; the local pollutant emissions contribute less to the pollution process. The special phenomenon of a positive correlation between NOx and O3 is forming by the co-accumulation and co-diffusion of O3 and NOx caused by Sea-land breeze, mountain-valley breeze, and topography.
