Observational studies of the meteorological characteristics associated with poor air quality over the Pearl River Delta in China

Wu, Meixia; Wu, Dui; Fan, Qingxia; Wang, B. M.; Li, H. W.; Fan, Saijun

doi:10.5194/acp-13-10755-2013

Cited by 94 publications

(64 citation statements)

References 35 publications

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“…Anticyclonic synoptic systems can often lead to a low-level subsidence inversion, inhibit the vertical dispersion of pollutants (i.e., NO x , SO 2 , CO, O 3 , PM 10 , PM 2.5 ), and subsequently influence local or regional air quality [8,9]. A stable weather condition with a high relative humidity also easily causes an accumulation of the regional air pollutants [10].…”

Section: Introductionmentioning

confidence: 99%

Effects of Strong East Asian Cold Surges on Improving the Air Quality over Mainland China

2016

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Abstract:A strong East Asian cold surge (SEACS) is one of the most distinct extreme weather events that can promote an improvement in local air quality. Combining East Asian atmospheric circulation with the air pollution index (API) datasets of 47 major cities throughout mainland China in 11 winter half-years (November-March) during 2001/2002-2011/2012, we investigated the influence of 39 SEACSs in conjunction with air pollution episodes on air quality over mainland China. The results showed that SEACS can cause considerable improvement in air quality and a remarkable decrease in the API over mainland China in up to 4 days after the SEACS outbreak day. The removal efficiency of air pollutants by SEACSs was greater than 30% in north central China, eastern southwest China, and southeast China. The occurrence date of the lowest value of the local API (indicating the best local air quality) can be observed as late day by day from northwest to southeast over mainland China after the SEACS outbreak, indicating a process of gradual improvement in Chinese air quality after the SEACS outbreak. When clean cold air originating from Siberia moves southward into coastal areas of southeastern China, the increase in sea level pressure, the drop in temperature and the enhancement in the northerly wind also tend to progress gradually from north to south over SEACS-affected East Asia. Thus, the "early in the north and late in the south" feature of air quality improvement by SEACSs over mainland China results from the southward movement of cold air masses from high to low latitudes after cold surge outbreaks.

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Section: Introductionmentioning

confidence: 99%

Effects of Strong East Asian Cold Surges on Improving the Air Quality over Mainland China

2016

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“…The uplift flows of TC also transport O 3 from the surface to the middle and upper troposphere (Fadnavis et al, 2011). Under the influence of frequent typhoon activities, O 3 episodes occurred over coastal areas in southeast China (Feng et al, 2007;Wu et al, 2013). The stagnant meteorological conditions with strong subsidence and stable stratification in the boundary layer resulted in pollutant accumulations with high O 3 before typhoon landings over southeast China (Feng et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Why does surface ozone peak before a typhoon landing in southeast China?

et al. 2015

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Abstract. A high O 3 episode with the large increases in surface ozone by 21-42 ppbv and the nocturnal surface O 3 levels exceeding 70 ppbv was observed in the region between Xiamen and Quanzhou over the southeastern coast of China during 12-14 June 2014, before the Typhoon Hagibis landing. Variations in the surface O 3 , NO 2 , CO and meteorology during the Typhoon Hagibis event clearly suggest a substantial impact of the peripheral downdrafts in the large-scale typhoon circulation on such an O 3 episode excluding the contributions of photochemical production and the horizontal transport. The influence of vertical O 3 transport from the upper troposphere and lower stratosphere (UTLS) region on high surface O 3 levels is further confirmed by a negative correlation between surface O 3 and CO concentrations as well as dry surface air observed during the O 3 episode. This study provides observational evidence of typhoon-driven intrusion of O 3 from the UTLS region to surface air, revealing a significant effect of such a process of stratosphere-troposphere exchange (STE) of O 3 on tropospheric O 3 and ambient air quality.

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“…Dabberdt et al (2004) have listed the meteorological research needs for improving air quality forecasting, one of which is to provide the model uncertainty information through ensemble prediction capabilities and quantify uncertainties and feedbacks between meteorological and air quality modeling components. Numerous studies have been performed in China to explore the role of meteorological conditions in the air pollution formation (e.g., Gao et al, 2011;Zhang et al, 2012Zhang et al, , 2015Wu et al, 2013;Wang et al, 2014;Bei et al, 2016a, b). Most recently, Liu et al (2017) have investigated the meteorological impacts on the PM 2.5 concentrations over Beijing-TianjinHebei (BTH) in December 2015.…”

Section: Introductionmentioning

confidence: 99%

Impacts of meteorological uncertainties on the haze formation in Beijing–Tianjin–Hebei (BTH) during wintertime: a case study

Bei

Elser

et al. 2017

Atmos. Chem. Phys.

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Abstract. In the present study, a persistent heavy haze episode from 13 to 20 January 2014 in Beijing-TianjinHebei (BTH) is simulated using the WRF-CHEM model through ensemble simulations to investigate impacts of meteorological uncertainties on the haze formation. Model results show that uncertainties in meteorological conditions substantially influence the aerosol constituent simulations at an observation site in Beijing, and the ratio of the ensemble spread to the ensemble mean (RESM) exceeds 50 %. The ensemble mean generally preforms well in reproducing the fine particles' (PM 2.5 ) temporal variations and spatial distributions against measurements in BTH. The meteorological uncertainties do not alter the PM 2.5 distribution pattern in BTH principally or dominate the haze formation and development, but remarkably affect the simulated PM 2.5 level, and the RESM for the simulated PM 2.5 concentrations can be up to 30 % at the regional scale. In addition, the rather large RESM in PM 2.5 simulations at the city scale also causes difficulties in evaluation of the control strategies. Therefore, our results suggest that the ensemble simulation is imperative to take into account the impact of the meteorological uncertainties on the haze prediction.

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Observational studies of the meteorological characteristics associated with poor air quality over the Pearl River Delta in China

Cited by 94 publications

References 35 publications

Effects of Strong East Asian Cold Surges on Improving the Air Quality over Mainland China

Effects of Strong East Asian Cold Surges on Improving the Air Quality over Mainland China

Why does surface ozone peak before a typhoon landing in southeast China?

Impacts of meteorological uncertainties on the haze formation in Beijing–Tianjin–Hebei (BTH) during wintertime: a case study

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