上海地区AQI变化特征及与气象因素的相关性

doi:10.3969/j.issn.1673-503X.2019.05.007

Abstract

Abstract: Based on the daily individual air quality index (IAQI) of PM_2.5,PM₁₀,CO,O₃,SO₂,and NO₂,observations of meteorological parameters (including wind speed,precipitation,temperature,relative humidity,total cloud cover,and low cloud cover),temperature inversion and upper-level atmospheric circulation data from 2012 to 2016,we analyzed the temporal variation of air quality index and the impact of climatic elements on air quality in Shanghai.We also compared the differences in atmospheric circulation during PM_2.5 and O₃ pollution events and clean days nearby.The results showed that the PM_2.5,PM₁₀,and NO₂ pollution events occur frequently in winter,with day numbers of 31.4 d,10.0 d and 14.8 d,respectively,while O₃ pollution events occur most frequently in summer (18.8 d).Wind speed and low cloud cover greatly affect PM_2.5 pollution,with the correlation coefficient of -0.313 and -0.261,respectively.O₃ pollution is closely related to air temperature and sunshine duration,with the correlation coefficient of 0.449 and 0.363,respectively.The formation of PM_2.5 and O₃ pollution also have a high correlation with a temperature inversion on the day and the former day.During PM_2.5 pollution events,Shanghai is located ahead of a high behind a trough,accompanied by strong northwesterly winds at 850 hPa,while for clean days,Shanghai is behind a high and the southeasterly flows are dominated at 850 hPa.For O₃ pollution events and clean days,the anomaly of outgoing longwave radiation (OLR) over eastern China is positive and negative,respectively.O₃ pollution is easy to occur under a clear sky and low cloud cover conditions due to the subtropical high,and it hardly occurs in the presence of high cloud cover in Shanghai.

Key words: Air quality index, Meteorological parameter, Weather pattern

CLC Number:

P458.1⁺24

ZHENG Qing-feng, SHI Jun, DONG Guang-tao, HUANG Wen-juan, XU Wei-zhong, WANG Quan-yuan. Characteristics of air quality index and its correlation with meteorological parameters in Shanghai[J]. Journal of Meteorology and Environment, 2019, 35(5): 53-62.

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Characteristics of air quality index and its correlation with meteorological parameters in Shanghai

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