Classification characteristics, circulation background and its effect on O3 of land and sea breeze in Shanghai
MAO Zhuo-cheng1,2, XU Jian-ming1,2, QU Yuan-hao1,2, YIN Chang-qin1,2, YANG Dan-dan1,2, ZHOU Guang-qiang1,2
1. Yangtze River Delta Center for Environmental Meteorology Prediction and Warning, Shanghai 200030, China; 2. Shanghai Key Laboratory of Meteorology and Health, Shanghai 200030, China
Abstract:A comparative analysis was made from meteorological factors (temperature, humidity and wind), six circulation backgrounds that formed sea land breeze and their impacts on O3 concentration of three types of land and sea breeze (North Branch, South Branch and Double Branch) in Shanghai from 2013 to 2019. The results show that there were 237 days of land and sea breeze in Shanghai from 2013 to 2019, of which the North Branch had the most days (209d) and the Double Branch had the least days(88d).The proportion of Double Branch land and sea breeze with the South Branch was the highest (75.9%);Among the three types of land and sea breeze, the North Branch had the earliest starting time, the longest maintenance time and the strongest sea breeze intensity. The South Branch had the highest average temperature, lower average humidity, and the most dispersed wind field; Compared with no sea and land breeze condition, O3 concentration in North Branch, South Branch and Double Branch increased by 20.5, 26.4 and 25.1μg/m3 respectively. O3 pollution concentration in South Branch was the same as that in no sea and land breeze condition, while that in North Branch and Double Branch were slightly lower than that in no land and sea breeze condition. Among the six weak circulation backgrounds forming Shanghai land and sea breeze, the high-pressure central type, the unsystematic type and the pressure equalizing field type were the most important three types, accounting for 70% in total; The results of the combination of circulation backgrounds and land and sea breeze types show that the highest probability of O3 pollution was the South Branch land and sea breeze of pressure equalization field type, reaching 40.0%. The highest combination of O3 concentration and O3 pollution concentration was South Branch land and sea breeze with the unsystematic type and the Double Branch land and sea breeze with the high pressure front type, with the average concentration of 146.6μg/m3 and 211.3μg/m3, respectively.
毛卓成, 许建明, 瞿元昊, 殷长秦, 杨丹丹, 周广强. 上海海陆风分类特征、环流背景及对O3的影响[J]. 中国环境科学, 2023, 43(3): 1002-1013.
MAO Zhuo-cheng, XU Jian-ming, QU Yuan-hao, YIN Chang-qin, YANG Dan-dan, ZHOU Guang-qiang. Classification characteristics, circulation background and its effect on O3 of land and sea breeze in Shanghai. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(3): 1002-1013.
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