A two-year study of carbonaceous aerosols in ambient PM2.5 at a regional background site for western Yangtze River Delta, China

To investigate the characteristics of size distributions and water-soluble ions compositions of atmospheric aerosol in different weather conditions in the area of Yangtze River delta in China, aerosol samples were collected with Andersen cascade sampler on typical clear and hazy days at Lin’an regional background station. The water-soluble ionic concentrations were analyzed by the ion chromatography (IC). Results showed the concentrations of SO42-, NO3-, NH4+ and K+ on hazy days were 20.14, 17.45, 10.30, and 1.27µg m-3 in fine particles, respectively, and the concentrations of NO3-, NH4+ and K+ were 14.50, 2.35 and 0.50µg m-3 in coarse particles, respectively. This was 1.1-2.9 times higher than on clear days. The concentrations of Ca2+, Na+, Mg2+ and Cl- on hazy days were 2.67, 1.33, 0.37, and 1.03µg m-3 in fine particles, respectively, and the concentrations of Ca2+, Na+, Mg2+, Cl- and SO42- were 4.34, 1.27, 0.41, 0.89 and 2.08µg m-3 in coarse particles, respectively. This was 0.6-0.9 times lower than on clear days. K+ and secondary particles including sulfate, nitrate and ammonium came from the long-range transport which mainly from the area of Yangtze River delta, which was the main cause of formation of haze.

Download Full-text

Seasonal variation of urban carbonaceous aerosols in a typical city Nanjing in Yangtze River Delta, China

Atmospheric Environment ◽

10.1016/j.atmosenv.2015.01.064 ◽

2015 ◽

Vol 106 ◽

pp. 223-231 ◽

Cited By ~ 57

Author(s):

Bing Li ◽

Jie Zhang ◽

Yu Zhao ◽

Siyu Yuan ◽

Qiuyue Zhao ◽

...

Keyword(s):

Seasonal Variation ◽

Yangtze River ◽

Yangtze River Delta ◽

River Delta ◽

Carbonaceous Aerosols

Download Full-text

Chemical characteristics of PM 2.5 during summer at a background site of the Yangtze River Delta in China

Atmospheric Research ◽

10.1016/j.atmosres.2017.08.012 ◽

2017 ◽

Vol 198 ◽

pp. 163-172 ◽

Cited By ~ 17

Author(s):

Linlin Liang ◽

Guenter Engling ◽

Xiaoye Zhang ◽

Junying Sun ◽

Yangmei Zhang ◽

...

Keyword(s):

Yangtze River ◽

Yangtze River Delta ◽

River Delta ◽

Chemical Characteristics ◽

The Yangtze River ◽

Pm 2.5 ◽

Background Site ◽

The Yangtze River Delta

Download Full-text

Characterization and Source Apportionment of Fine Particles during a Heavy Pollution Episode over the Yangtze River Delta, China

Atmosphere ◽

10.3390/atmos11070720 ◽

2020 ◽

Vol 11 (7) ◽

pp. 720

Author(s):

Li Xia ◽

Bin Zhu ◽

Honglei Wang ◽

Hanqing Kang ◽

Junlin An

Keyword(s):

Yangtze River ◽

Fine Particles ◽

Yangtze River Delta ◽

River Delta ◽

Chemical Components ◽

The Yangtze River ◽

Air Masses ◽

Regional Background ◽

The Yangtze River Delta ◽

Rainy Days

Regional-scale field observations of fine particles (PM2.5) were carried out at urban, suburban and regional background sites across the Yangtze River Delta (YRD) from 15–30 January 2015. The coefficients of divergence (CD) values reveal the similarity of dataset at the three sites. The PM2.5 concentrations and meteorological data exhibit temporal synchronization. From January 15 to 26, the YRD experienced severe PM2.5 pollution resulting from a cold front moving through and high-pressure control. Then, a 4-day intermittent rain event from 27–30 January significantly scavenged PM2.5. For the chemical components in PM2.5, secondary inorganic ions were dominant, and they accounted for larger proportions at the urban and suburban sites than at the regional background site. The OC/EC ratios were higher in daytime than at night, and were lower on polluted days than on clean (rainy) days. The principal sources of PM2.5 were secondary nitrate (38%) and sulfate (23%) formation, biomass burning (14%), and marine source (8%). Marine (16%) and sulfate (30%) sources were enhanced on clean (rainy) days, indicating the notable effect of marine air masses on PM2.5 chemical components. The open burning source contribution at the regional site was the largest during the polluted period because more air masses arrived from combustion zones.

Download Full-text