Regional characteristics of spring Asian dust and its impact on aerosol chemistry over northern China

Sun, Yifei; Zhuang, Guoshun; Wang, Z. F.; Wang, Yu; Zhang, W. J.; Tang, Aohan; Zhao, Xiaobing; Jia, Lü

doi:10.5194/acpd-6-12825-2006

Cited by 6 publications

(3 citation statements)

References 35 publications

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“…Firstly, due to the long sampling duration of our study (∼1 week), NO − 3 in each sample had formed from both homogenous and heterogeneous reactions, and thus a good correlation between 2− 4 ], NO − 3 tends to partition into coarse particles with abundant alkaline mineral components (Pakkanen et al, 1996;Zhuang et al, 1999). Consequently there is a decrease in [NO − 3 ]/[SO 2− 4 ] that is positively correlated with [NH + 4 ]/[SO 2− 4 ] in fine particles (Sun et al, 2006).…”

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confidence: 56%

Spatial and seasonal variability of PM2.5 acidity at two Chinese megacities: insights into the formation of secondary inorganic aerosols

et al. 2012

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Abstract. Aerosol acidity is one of the most important parameters influencing atmospheric chemistry and physics. Based on continuous field observations from January 2005 to May 2006 and thermodynamic modeling, we investigated the spatial and seasonal variations in PM2.5 acidity in two megacities in China, Beijing and Chongqing. Spatially, PM2.5 was generally more acidic in Chongqing than in Beijing, but a reverse spatial pattern was found within the two cities, with more acidic PM2.5 at the urban site in Beijing whereas the rural site in Chongqing. Ionic compositions of PM2.5 revealed that it was the higher concentrations of NO3− at the urban site in Beijing and the lower concentrations of Ca2+ within the rural site in Chongqing that made their PM2.5 more acidic. Temporally, PM2.5 was more acidic in summer and fall than in winter, while in the spring of 2006, the acidity of PM2.5 was higher in Beijing but lower in Chongqing than that in 2005. These were attributed to the more efficient formation of nitrate relative to sulfate as a result of the influence of Asian desert dust in 2006 in Beijing and the greater wet deposition of ammonium compared to sulfate and nitrate in 2005 in Chongqing. Furthermore, simultaneous increase of PM2.5 acidity was observed from spring to early summer of 2005 in both cities. This synoptic-scale evolution of PM2.5 acidity was accompanied by the changes in air masses origins, which were influenced by the movements of a subtropical high over the northwestern Pacific in early summer. Finally, the correlations between [NO3−]/[SO42−] and [NH4+]/[SO42−] suggests that under conditions of high aerosol acidity, heterogeneous reactions became one of the major pathways for the formation of nitrate at both cities. These findings provided new insights in our understanding of the spatial and temporal variations in aerosol acidity in Beijing and Chongqing, as well as those reported in other cities in China.

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confidence: 56%

Spatial and seasonal variability of PM2.5 acidity at two Chinese megacities: insights into the formation of secondary inorganic aerosols

et al. 2012

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“…The ]/[SO 2− 4 ], NO − 3 tends to partition into coarse particles with abundant alkaline mineral components (Pakkanen et al, 1996;Zhuang et al, 1999). Consequently there is a decrease in [NO − 3 ]/[SO 2− 4 ] that is positively correlated with [NH + 4 ]/[SO 2− 4 ] in fine particles (Sun et al, 2006).…”

Section: K He Et Al: Insights Into the Formation Of Secondary Inorganic Aerosolsmentioning

confidence: 99%

Spatial and seasonal variability of PM2.5 acidity at two Chinese megacities: insights into the formation of secondary inorganic aerosols

He¹,

Zhao²,

Ma³

et al. 2011

Preprint

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Aerosol acidity is one of the most important parameters influencing atmospheric chemistry and physics. Based on continuous field observation from January 2005 to May 2006, both spatial and seasonal variation in PM_2.5 acidity was investigated at Beijing and Chongqing, two megacities in northern and southwestern China, respectively. PM_2.5 was generally more acidic at urban and rural sites in Chongqing than Beijing, but a reverse spatial pattern was found within the two cities, with more acidic PM_2.5 at urban Beijing and rural Chongqing comparing to their rural and urban sites, respectively. PM_2.5 was more acidic in summer and fall than in winter, while large inter-annual variations were evident during the springs of 2005 and 2006, with Beijing and Chongqing exhibiting opposite trends, however. The higher acidity of PM_2.5 in the spring of 2006 in Beijing was attributed to the influence of Asian desert dust which significantly enhanced the formation of nitrate relative to sulfate; in contrast, the more acidic aerosols found during the spring of 2005 in Chongqing was mainly due to the greater wet deposition of ammonium, and precipitation was probably one of the key factors that controlled the partition of ammonium in PM_2.5 and rain water over the surrounding region. Meanwhile, PM_2.5 became more acidic at both cities from spring into early summer of 2005. The synoptic-scale evolution of its acidity was found to be closely associated with the greater contribution of air masses from between the Northern China Plain to the south of Beijing, and from central China to the east of Chongqing, and was ended by the northward movement of a subtropical high over the northwestern Pacific, a major element of the Asian summer monsoon. Under conditions of high aerosol acidity, heterogeneous reactions may become one of the major pathways for the formation of nitrate at both cities. These findings may also explain the significant variation in inter-annual aerosol acidity observed during other seasons at Beijing, Chongqing and many other cities in China, as reported in previous studies

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“…Besides anthropogenic pollution sources like industrial production, transportation and human domestic activities, the air pollution sources also include natural sources, especially aeolian dust. As a type of aerosol, aeolian dust is not only an important source of atmospheric particulate matter (PM), a natural factor influencing the concentration of air pollutants through a series of chemical reactions in the downstream areas [7,8], but also a significant risk factor for human health, which is closely associated with the morbidity of respiratory and cardiovascular diseases [9][10][11]. Under the condition of a favorable large-scale circulation background and superimposed weather systems of different scales in arid and semi-arid regions, severe dust storms can develop into disastrous events and have seriously affected the air quality of the source and downstream regions [12][13][14], human health [15][16][17], cloud microphysics [18], climate system [19,20], and even marine ecosystems [21,22].…”

Section: Introductionmentioning

confidence: 99%

The Impacts of Taklimakan Dust Events on Chinese Urban Air Quality in 2015

Liu

Yin

2018

Atmosphere

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Aerosols are an important factor affecting air quality. As the largest source of dust aerosol of East Asia, the Taklimakan Desert in Northwest China witnesses frequent dust storm events, which bring about significant impacts on the downstream air quality. However, the scope and timing of the impacts of Taklimakan dust events on Chinese urban air quality have not yet been fully investigated. In this paper, based on multi-source dust data including ground observations, satellite monitoring, and reanalysis products, as well as air quality index (AQI) and the mass concentrations of PM10 and PM2.5 at 367 urban stations in China for 2015, we examined the temporal and spatial characteristics of the impacts of the Taklimakan dust events on downstream urban air quality in China. The results show that the Taklimakan dust events severely affected the air quality of most cities in Northwest China including eastern Xinjiang, Hexi Corridor and Guanzhong Basin, and even northern Southwest China, leading to significant increases in mass concentrations of PM10 and PM2.5 in these cities correlating with the occurrence of dust events. The mass concentrations of PM10 on dust days increased by 11–173% compared with the non-dust days, while the mass concentration of PM2.5 increased by 21–172%. The increments of the mass concentrations of PM10 and PM2.5 on dust days decreased as the distances increased between the cities and the Taklimakan Desert. The influence of the Taklimakan dust events on the air quality in the downstream cities usually persisted for up to four days. The mass concentrations of PM10 and PM2.5 increased successively and the impact duration shortened gradually with increasing distances to the source area as a strong dust storm progressed toward the southeast from the Taklimakan Desert. The peaks of the PM10 concentrations in the downstream cities of eastern Xinjiang, the Hexi Corridor and the Guanzhong Basin occurred on the second, third and fourth days, respectively, after the initiation of the Taklimakan dust storm.

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Regional characteristics of spring Asian dust and its impact on aerosol chemistry over northern China

Cited by 6 publications

References 35 publications

Spatial and seasonal variability of PM<sub>2.5</sub> acidity at two Chinese megacities: insights into the formation of secondary inorganic aerosols

Spatial and seasonal variability of PM<sub>2.5</sub> acidity at two Chinese megacities: insights into the formation of secondary inorganic aerosols

Spatial and seasonal variability of PM<sub>2.5</sub> acidity at two Chinese megacities: insights into the formation of secondary inorganic aerosols

The Impacts of Taklimakan Dust Events on Chinese Urban Air Quality in 2015

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Regional characteristics of spring Asian dust and its impact on aerosol chemistry over northern China

Cited by 6 publications

References 35 publications

Spatial and seasonal variability of PM&lt;sub&gt;2.5&lt;/sub&gt; acidity at two Chinese megacities: insights into the formation of secondary inorganic aerosols

Spatial and seasonal variability of PM&lt;sub&gt;2.5&lt;/sub&gt; acidity at two Chinese megacities: insights into the formation of secondary inorganic aerosols

Spatial and seasonal variability of PM&lt;sub&gt;2.5&lt;/sub&gt; acidity at two Chinese megacities: insights into the formation of secondary inorganic aerosols

The Impacts of Taklimakan Dust Events on Chinese Urban Air Quality in 2015

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Spatial and seasonal variability of PM<sub>2.5</sub> acidity at two Chinese megacities: insights into the formation of secondary inorganic aerosols

Spatial and seasonal variability of PM<sub>2.5</sub> acidity at two Chinese megacities: insights into the formation of secondary inorganic aerosols

Spatial and seasonal variability of PM<sub>2.5</sub> acidity at two Chinese megacities: insights into the formation of secondary inorganic aerosols