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Atmospheric particulate mercury in the megacity Beijing: Spatio-temporal variations and source apportionment
https://orcid.org/0000-0003-2631-908X
Abstract Particulate mercury (HgP) concentrations in weekly aerosol samples (PM2.5 and TSP) from Beijing, China, were measured for a complete year. In addition, spatial differences were measured for a shorter time period at four different sites and potential source materials were analyzed. Average HgP concentrations in PM2.5 samples were 0.26 ng/m3 for day-time PM2.5, 0.28 ng/m3 for night-time PM2.5, and 0.57 ng/m3 for TSP samples, respectively. Coal combustion was identified as the major source of HgP in Beijing. Other sources included industrial activities as well as red color on historical buildings as a minor contribution. Spatial differences were pronounced with highest concentrations in the inner city (inside the 3rd ring road). The results further showed a strong seasonality with highest concentrations in winter and lowest in summer due to local meteorological conditions (precipitation in summer and stagnant conditions and low mixing layer height in winter) as well as seasonal sources, such as coal combustion for heating purposes. Day–night differences also showed a seasonal pattern with higher night-time concentrations during summer and higher day-time concentrations during winter. Compared to other cities worldwide, the HgP concentrations in Beijing were alarmingly high, suggesting that airborne particulate Hg should be the focus of future monitoring activities and mitigation measures.
Highlights Particulate mercury (HgP) in aerosols (PM2.5/TSP) was studied in the megacity Beijing. HgP was measured at four sites and day- and night-time samples were distinguished. HgP was highest in winter due to meteorological conditions and heating activities. Coal combustion was identified as the major source for HgP in Beijing. HgP was highest in the inner city due to the additional input from local sources.
Atmospheric particulate mercury in the megacity Beijing: Spatio-temporal variations and source apportionment
https://orcid.org/0000-0003-2631-908X
Abstract Particulate mercury (HgP) concentrations in weekly aerosol samples (PM2.5 and TSP) from Beijing, China, were measured for a complete year. In addition, spatial differences were measured for a shorter time period at four different sites and potential source materials were analyzed. Average HgP concentrations in PM2.5 samples were 0.26 ng/m3 for day-time PM2.5, 0.28 ng/m3 for night-time PM2.5, and 0.57 ng/m3 for TSP samples, respectively. Coal combustion was identified as the major source of HgP in Beijing. Other sources included industrial activities as well as red color on historical buildings as a minor contribution. Spatial differences were pronounced with highest concentrations in the inner city (inside the 3rd ring road). The results further showed a strong seasonality with highest concentrations in winter and lowest in summer due to local meteorological conditions (precipitation in summer and stagnant conditions and low mixing layer height in winter) as well as seasonal sources, such as coal combustion for heating purposes. Day–night differences also showed a seasonal pattern with higher night-time concentrations during summer and higher day-time concentrations during winter. Compared to other cities worldwide, the HgP concentrations in Beijing were alarmingly high, suggesting that airborne particulate Hg should be the focus of future monitoring activities and mitigation measures.
Highlights Particulate mercury (HgP) in aerosols (PM2.5/TSP) was studied in the megacity Beijing. HgP was measured at four sites and day- and night-time samples were distinguished. HgP was highest in winter due to meteorological conditions and heating activities. Coal combustion was identified as the major source for HgP in Beijing. HgP was highest in the inner city due to the additional input from local sources.
Atmospheric particulate mercury in the megacity Beijing: Spatio-temporal variations and source apportionment
https://orcid.org/0000-0003-2631-908X
Abstract Particulate mercury (HgP) concentrations in weekly aerosol samples (PM2.5 and TSP) from Beijing, China, were measured for a complete year. In addition, spatial differences were measured for a shorter time period at four different sites and potential source materials were analyzed. Average HgP concentrations in PM2.5 samples were 0.26 ng/m3 for day-time PM2.5, 0.28 ng/m3 for night-time PM2.5, and 0.57 ng/m3 for TSP samples, respectively. Coal combustion was identified as the major source of HgP in Beijing. Other sources included industrial activities as well as red color on historical buildings as a minor contribution. Spatial differences were pronounced with highest concentrations in the inner city (inside the 3rd ring road). The results further showed a strong seasonality with highest concentrations in winter and lowest in summer due to local meteorological conditions (precipitation in summer and stagnant conditions and low mixing layer height in winter) as well as seasonal sources, such as coal combustion for heating purposes. Day–night differences also showed a seasonal pattern with higher night-time concentrations during summer and higher day-time concentrations during winter. Compared to other cities worldwide, the HgP concentrations in Beijing were alarmingly high, suggesting that airborne particulate Hg should be the focus of future monitoring activities and mitigation measures.
Highlights Particulate mercury (HgP) in aerosols (PM2.5/TSP) was studied in the megacity Beijing. HgP was measured at four sites and day- and night-time samples were distinguished. HgP was highest in winter due to meteorological conditions and heating activities. Coal combustion was identified as the major source for HgP in Beijing. HgP was highest in the inner city due to the additional input from local sources.
Atmospheric particulate mercury in the megacity Beijing: Spatio-temporal variations and source apportionment
Schleicher, N.J. (author) / Schäfer, J. (author) / Blanc, G. (author) / Chen, Y. (author) / Chai, F. (author) / Cen, K. (author) / Norra, S. (author)
Atmospheric Environment ; 109 ; 251-261
2015-03-09
11 pages
Article (Journal)
Electronic Resource
English
Spatio-temporal variations of black carbon concentrations in the Megacity Beijing
| Online Contents | 2013