Number concentration and size distributions of submicron particles in Jinan urban area: Characteristics in summer and winter

Gao, Jian; Wang, Jin; Cheng, Sainan; Xue, Likun; Yan, Huiping; Hou, Lijun; Jiang, Yuquan; Wang, Wenxing

doi:10.1016/s1001-0742(07)60239-3

Cited by 37 publications

(13 citation statements)

References 28 publications

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“…About 67 % of particles fell in the size range of 10-100 nm, and the percent further increased to 91 % when enlarged to 10-200 nm. This result is in good agreement with the early observations that urban ambient aerosols mainly distribute in ultrafine size section (Woo et al, 2001;Gao et al, 2007), slightly higher than 62 % reported in Nanjing and 61 % in Atlanta, a little lower than 72 % in Eastern Germany and significantly lower than 94 % in Taicang (Woo et al, 2001;Tuch et al, 1997;Gao et al, 2009;Kang et al, 2013). Cloud condensation nuclei (CCN) constitute an important fraction of atmospheric aerosol population, and can indirectly influence global climate change through modifying the microphysical and radiative properties and lifetime of cloud (IPCC, 2013).…”

Section: Condensation Nuclei and Cloud Condensation Nucleisupporting

confidence: 92%

Insights into a historic severe haze event in Shanghai: synoptic situation, boundary layer and pollutants

Leng

Duan

et al. 2016

Atmos. Chem. Phys.

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Abstract. A historic haze event, characterized by lengthy, large-scale and severe pollution, occurred in the Yangtze River Delta (YRD) of China from 1 to 10 December 2013. This haze event significantly influenced air quality throughout the region, especially in urban areas. Aerosol physical, chemical and optical properties were measured in Shanghai. Sometimes the 1 h average particle concentration (e.g., PM 2.5 ) exceeded 600 µg m −3 . Inorganic water-soluble ions in particles, trace gases and aerosol optical coefficients had a similar tendency to increase evidently from clear to hazy episodes. A combination of various factors contributed to the formation and evolution of the haze event, among which meteorological conditions, local anthropogenic emissions and pollutants are the major factors. High pressure system, calm surface wind and subsidence airflow were responsible for the decrease of planetary boundary layer (PBL) and the accumulation of pollutants. Atmospheric visibility correlated strongly with relative humidity (RH), particle number in size of 600-1400 nm other than particulate water-soluble species and particle mass (PM 2.5 ). The particle hygroscopicity plays an important role in atmospheric visibility reduction. The results are somewhat helpful to forecast and eliminate regional atmospheric pollution in China.

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Section: Condensation Nuclei and Cloud Condensation Nucleisupporting

confidence: 92%

Insights into a historic severe haze event in Shanghai: synoptic situation, boundary layer and pollutants

Leng

Duan

et al. 2016

Atmos. Chem. Phys.

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“…Table 1 is the overview of particle number concentrations measured in different urban, rural, and remote environments in China. The mean total number concentration at SDZ is much lower than that in Beijing, 32 800 cm −3 , Shanghai suburban site, 30187 cm −3 (Gao et al, 2009), also lower than that in Jinan city, 10 685-17 387 cm −3 (Gao et al, 2007) and some rural sites like Yufa, 17000 cm −3 (Yue et al, 2009) and Xinken, 16 300 cm −3 , but much higher than that at a remote background station, Mt. Waliguan, a global GAW sites in China, 2030 cm −3 (Kivekäs et al, 2009).…”

Section: Overview Of the Particle Number Concentrationmentioning

confidence: 69%

First long-term study of particle number size distributions and new particle formation events of regional aerosol in the North China Plain

et al. 2011

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Abstract. Atmospheric particle number size distributions (size range 0.003-10µm) were measured between March 2008 and August 2009 at Shangdianzi (SDZ), a rural research station in the North China Plain. These measurements were made in an attempt to better characterize the tropospheric background aerosol in Northern China. The mean particle number concentrations of the total particle, as well as the nucleation, Aitken, accumulation and coarse mode were determined to be 1.2 ± 0.9 × 10 4 , 3.6 ± 7.9 × 10 3 , 4.4 ± 3.4 × 10 3 , 3.5 ± 2.8 × 10 3 and 2 ± 3 cm −3 , respectively. A general finding was that the particle number concentration was higher during spring compared to the other seasons. The air mass origin had an important effect on the particle number concentration and new particle formation events. Air masses from northwest (i.e. inner Asia) favored the new particle formation events, while air masses from southeast showed the highest particle mass concentration. Significant diurnal variations in particle number were observed, which could be linked to new particle formation events, i.e. gas-to-particle conversion. During particle formation events, the number concentration of the nucleation mode rose up to maximum value of 10 4 cm −3 . New particle formation events were observed on 36% of the effective measurement days. The formation rate ranged from 0.7 to 72.7 cm −3 s −1 , with a mean value of 8.0 cm −3 s −1 . The value of the nucleation mode growth rate was in the range of 0.3-14.5 nm h −1 , with a mean value of 4.3 nm h −1 . It was anCorrespondence to: J. Y. Sun (jysun@cams.cma.gov.cn) essential observation that on many occasions the nucleation mode was able to grow into the size of cloud condensation nuclei (CCN) within a matter of several hours. Furthermore, the new particle formation was regularly followed by a measurable increase in particle mass concentration and extinction coefficient, indicative of a high abundance of condensable vapors in the atmosphere under study.

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“…During recent years, efforts have been made to characterize particle number size distributions and NPF events in developing countries as well, because their air pollution problems are of significant local and even regional concern, such as in New Delhi, Pune and Kanpur [36,37]. In China, the systematic analysis for NPF events and particle size distribution are conducted at some locations, such as urban and rural sites of Beijing [38][39][40], Pearl River Delta [41,42], Yangtze River Delta [43][44][45][46][47], Shandong [48], Shanghai [49], and Lanzhou [50] and Xi'an [51]. All these observations reveal that NPF is a common phenomenon that can occur in clean and polluted environments, but the nucleation and growth property of the process vary by a great margin due to the difference of the precursors and the complexity of the meteorological conditions.…”

Section: Introductionmentioning

confidence: 99%

Different Characteristics of New Particle Formation Events at Two Suburban Sites in Northern China

Yan

Dong

et al. 2017

Atmosphere

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Abstract:The formation of new atmospheric aerosol particles and their subsequent growth have been observed under different environmental conditions globally; such observations are few over northwest China. Here, we present an analysis of some case studies for new particle formation (NPF) events from two distinct suburban locations in northern China during May and June of two consecutive years, and provide more information to understand the characteristics of NPF events in North China. Particle number size distribution was measured at suburbs of Beijing (39.75 • N, 116.96 • E) during 1 June to 2 July 2013 and at suburbs of Xi'an (34.09 • N, 108.55 • E) during 1 to 25 May 2014. The average of total particle number concentration in the similar size range of 10-487 nm at the suburbs of Beijing (9.0 × 10 3 cm −3 ) was about two times higher than those observed at Xi'an (4.7 × 10 3 cm −3 ), and the mean particle mode diameter at Beijing was 1.4-fold higher than that at Xi'an. The estimated total condensation sink (CS) at Beijing (3.11 × 10 −2 s −1 ) was also higher than at Xi'an (1.13 × 10 −2 s −1 ). The frequency of NPF events at suburb of Beijing was 24%, lower than that in Xi'an (50%), and also lower than urban site of Beijing (35% in June) and another suburb of Beijing (over 50% in June). The NPF events with (Class I) or without (Class II) subsequent growth were both observed at the two suburb sites. The derived GR at the suburb of Beijing (range from 4.6 to 8.6 nm h −1 ) was a little higher than that at Xi'an (range from 3.3 to 6.7 nm h −1 ), which are generally comparable to typical values in mid-latitude reported in previous studies. The air masses coming from north or northwest China favor the occurrence of NPF event under low condensation sink and clear days. The number size distributions of freshly nucleated particles showed clear bimodal distributions on both sites. Additionally, Mode D p of nucleated particles at the two sites was 17 ± 1 nm and 22 ± 4 nm, respectively during the periods with NPF events. The case study of NPF events at the two suburb sites shows that the surface area concentration and total scattering coefficient (SC) was significant decreased during the NPF events at both sites. High temperature, low condensation sink and low relative humidity furthered the occurrence of NPF events, and wind direction shifts were important for the subsequent growth of particles. NPF events in the suburbs of Beijing usually occurred when relative humidity (RH) < 55%, CS < 0.02 s −1 , or 55% < RH < 68%, CS < 0.01 s −1 . However, there is no clear range for Xi'an. Furthermore, we observed that some NPF events occurred at higher RH and very low CS in this study on both sites, which means that low CS may be more important than low RH for the particle formation on clear days.

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Number concentration and size distributions of submicron particles in Jinan urban area: Characteristics in summer and winter

Cited by 37 publications

References 28 publications

Insights into a historic severe haze event in Shanghai: synoptic situation, boundary layer and pollutants

Insights into a historic severe haze event in Shanghai: synoptic situation, boundary layer and pollutants

First long-term study of particle number size distributions and new particle formation events of regional aerosol in the North China Plain

Different Characteristics of New Particle Formation Events at Two Suburban Sites in Northern China

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