Weather Impacts on Air Quality of the World Expo in Shanghai

Chen Min; Ma Leiming; Wei Haiping; Shi Hong; Ma Jinghui; Zhou Guangqiang; Gu Songqiang; Zhang Guolian

Vol.24, NO.2, 2013

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2013 > 24(2): 140-150

Chen Min, Ma Leiming, Wei Haiping, et al. Weather impacts on air quality of the World Expo in Shanghai. J Appl Meteor Sci, 2013, 24(2): 140-150.

Citation:

Chen Min, Ma Leiming, Wei Haiping, et al. Weather impacts on air quality of the World Expo in Shanghai. J Appl Meteor Sci, 2013, 24(2): 140-150.

Chen Min, Ma Leiming, Wei Haiping, et al. Weather impacts on air quality of the World Expo in Shanghai. J Appl Meteor Sci, 2013, 24(2): 140-150.

Citation:

Chen Min, Ma Leiming, Wei Haiping, et al. Weather impacts on air quality of the World Expo in Shanghai. J Appl Meteor Sci, 2013, 24(2): 140-150.

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Weather Impacts on Air Quality of the World Expo in Shanghai

1.
Shanghai Center of Urban Environmental Meteorology, Shanghai 200135
2.
Shanghai Typhoon Institute of CMA, Shanghai 200030
3.
Shanghai Environmental Monitoring Center, Shanghai 200030

Received Date: 2012-04-21
Rev Recd Date: 2012-12-28
Publish Date: 2013-04-30

Abstract

Abstract

From the statistics of environmental observations, it shows that the air quality in Shanghai during the 2010 World Expo (1 May to 31 Oct) is the best for the same period since 2001. The number with good air quality days adds up to 181, accounting for 98.4% of the total 184 days. From the integrated data of the near-surface meteorological observation in Shanghai in recent 10 years, NCEP/NCAR reanalysis data from 1981, and the circulation indices of National Climate Center of CMA since 1951, the phenomenon is preliminary investigated, revealing the near-surface meteorological situation and the atmospheric circulation characteristics which affect the dispersion and deposition of air pollution during the 2010 World Expo and the same period in history. The detailed mechanisms for the impact of atmospheric condition on air quality are further investigated, and the major results are as follows.The greatly enhanced easterly winds, less calm wind days, significantly less near-surface temperature inversion and more precipitation favor the dispersion and deposition of air particles and the improvement of air quality in Shanghai during the 2010 World Expo.Subtropical high over the western Pacific during the 2010 World Expo is more intensive and extensive, and extending further west compared to that of recent years. As a result, the easterly airflow to the south of subtropical high is strengthened which leads to the prevailing easterly winds in Shanghai.During the 2010 World Expo in Shanghai under the same situation of various dominant wind, e.g., calm wind, NNE-SSE wind, or NNW-SSW wind, corresponding API indices are lower than the value of the same period in 2001—2009, which reflects the effect of pollution reduction due to "Joint Implementation of Air Quality Regulating and Controlling over the Yangtze River Delta Region during the World Expo" carried out by Jiangsu, Zhejiang and Shanghai.Although, with the joint action and its advantage, it is noticed that there are three heavy pollution episodes occurred in Shanghai during the World Expo due to the depressed weather conditions of transportation and dispersion. This result depicts that weather situation plays one of the major roles which decide the good air quality during the World Expo in Shanghai.
- the World Expo in Shanghai;
- air quality;
- atmospheric circulation;
- meteorological elements

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References(20)

Figures and Tables

Fig. 1 Distribution of daily API during the 2010 World Expo in Shanghai

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Fig. 2 Interannual distribution of the average API index and the good air quality rate during the same World Expo period of 2001—2010 in Shanghai

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Fig. 3 Interannual distribution of pollution days and its average API index during the same World Expo period of 2001—2010 in Shanghai

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Fig. 4 Distribution of the prevailing winds and average API index during the same World Expo period of 2001—2009 in Shanghai

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Fig. 5 Interannual distribution of ground inversion days at 0800 BT in Shanghai during 2001—2009

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Fig. 6 Interannual distribution of the cumulative precipitation and rain days in Shanghai during 2001—2009

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Fig. 7 Prevailing wind rose of the 2010 World Expo in Shanghai

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图 8 2010年4月26日—5月1日上海宝山站高空风时序图

(图中等值线为等风速线，单位：m·s^-1)

Fig. 8 The time profile of upper wind at Baoshan Station in Shanghai from 26 Apr to 1 May in 2010

(the isoline denotes the isotad, unit:m·s^-1)

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Fig. 9 500 hPa average circulation in summer during 1981—2010(a) and the circulation in 2010(b) with its anomaly (c)(unit:gpm)

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Table 1 The good air quality rate during the same World Expo period of 2001—2010 in Shanghai (unit:%)

年份	5月	6月	7月	8月	9月	10月
2001	80.65	100.00	100.00	96.77	100.00	96.77
2002	87.10	93.33	93.55	100.00	80.00	77.42
2003	96.77	86.67	100.00	100.00	96.67	83.87
2004	90.32	83.33	96.77	93.55	100.00	80.65
2005	96.77	96.67	100.00	96.77	100.00	80.65
2006	83.87	93.33	100.00	96.77	100.00	90.32
2007	74.19	96.67	100.00	96.77	100.00	100.00
2008	93.55	100.00	100.00	96.77	100.00	90.32
2009	100.00	90.00	100.00	100.00	100.00	83.87
2010	93.55	100.00	100.00	100.00	100.00	96.77

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References

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