2015年上海地区空气质量状况及其与气象条件的关系

doi:10.3969/j.issn.1673-503X.2018.02.007

Abstract

Abstract: Using the air quality data from 2001 to 2015 and the meteorological data from 2014 to 2015,the air quality status,variation characteristics,and the corresponding meteorological factors in Shanghai in the context of strong El Niño atmospheric circulation in 2015 were analyzed.The results show that average annual concentrations of PM 10 and SO₂ in 2015 in Shanghai reach the lowest values during the recent 15 years,and that of NO₂ reaches its second lowest value.The air pollution situation in Shanghai has shifted from the traditional coal burning pollutants,such as sulfur,nitrogen,and PM₁₀,to a compound pollution represented by PM_2.5 and photochemical pollution represented by O₃.Among the three firsttier cities,the excellent and good rate of air quality and average concentrations of PM_2.5 and PM₁₀ in 2015 in Shanghai are all between those in Beijing and Guangzhou.The average annual concentrations of NO 2 and O₃ in Shanghai are the lowest,and that of SO₂ in Shanghai is the highest.The concentration of PM_2.5 in Shanghai in 2015 is higher than that in 2014.Compared with 2014,the concentration of PM_2.5 in Shanghai decreases significantly in spring and summer in 2015,and those in the easily-polluted seasons including January,February,October,November and December increase significantly.This is mainly due to the lower wind speed,fewer times of continuous small winds,stronger in the inversion intensity,more times of inverse temperature,and increasing intensity in the west wind transport in the easily-polluted seasons in 2015.Influenced by the strong El Niño event,a weaker cold air activity is formed due to the polar vortex contraction in the northern hemisphere,strengthening in the Eurasian Zonal Circulation,and weakening and eastward in the East Asia Trough in the pollution season.It provides an atmospheric circulation background for the bad air quality condition in 2015 in Shanghai.

Key words: Easily-polluted season, Air quality, Meteorological condition, El Niño event, Atmospheric circulation

CLC Number:

MAO Zhuo-cheng, MA Jing-hui, QU Yuan-hao, YU Zhong-qi, ZHOU Guang-qiang, XU Jian-ming. Relationships between air quality and meteorological conditions in Shanghai in 2015[J]. Journal of Meteorology and Environment, 2018, 34(2): 52-60.

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Relationships between air quality and meteorological conditions in Shanghai in 2015

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