Till sidans topp

Sidansvarig: Webbredaktion
Sidan uppdaterades: 2012-09-11 15:12

Tipsa en vän
Utskriftsversion

Size distributions of aer… - Göteborgs universitet Till startsida
Webbkarta
Till innehåll Läs mer om hur kakor används på gu.se

Size distributions of aerosol sulfates and nitrates in Beijing during the 2008 Olympic Games: Impacts of pollution control measures and regional transport

Artikel i vetenskaplig tidskrift
Författare X. F. Wang
T. Wang
Ravi K. Pathak
Mattias Hallquist
X. M. Gao
W. Nie
L. K. Xue
J. Gao
R. Gao
Q. Z. Zhang
W. X. Wang
S. L. Wang
F. H. Chai
Y. Z. Chen
Publicerad i Advances in Atmospheric Sciences
Volym 30
Nummer/häfte 2
Sidor 341-353
ISSN 0256-1530
Publiceringsår 2013
Publicerad vid Institutionen för kemi och molekylärbiologi
Sidor 341-353
Språk en
Länkar dx.doi.org/10.1007/s00376-012-2053-...
Ämnesord size distribution, aerosol, sulfate, nitrate, control effect, Olympic Games, air-quality, ionic compositions, ambient air, china, particles, pm2.5, pollutants, summer, guangzhou, climate
Ämneskategorier Meteorologi och atmosfärforskning

Sammanfattning

For the 2008 Olympic Games, drastic control measures were implemented on industrial and urban emissions of sulfur dioxide (SO2), nitrogen oxides (NO (x) ) and other pollutants to address the issues of poor air quality in Beijing. To investigate the effects of SO2 and NO (x) reductions on the particulate sulfate and nitrate concentrations as well as their size distributions, size-segregated aerosol samples were collected using micro-orifice uniform deposit impactors (MOUDIs) at urban and downwind rural sites in Beijing before and after full-scale controls. During the sampling period, the mass concentrations of fine particles (PM1.8) at the urban and rural sites were 94.0 and 85.9 mu g m(-3), respectively. More than 90% of the sulfates and similar to 60% of nitrates formed as fine particles. Benefiting from the advantageous meteorological conditions and the source controls, sulfates were observed in rather low concentrations and primarily in condensation mode during the Olympics. The effects of the control measures were separately analyzed for the northerly and the southerly air-mass-dominated days to account for any bias. After the control measures were implemented, PM, sulfates, and nitrates were significantly reduced when the northerly air masses prevailed, with a higher percentage of reduction in larger particles. The droplet mode particles, which dominated the sulfates and nitrates before the controls were implemented, were remarkably reduced in mass concentration after the control measures were implemented. Nevertheless, when the polluted southerly air masses prevailed, the local source control measures in Beijing did not effectively reduce the ambient sulfate concentration due to the enormous regional contribution from the North China Plain.

Sidansvarig: Webbredaktion|Sidan uppdaterades: 2012-09-11
Dela:

På Göteborgs universitet använder vi kakor (cookies) för att webbplatsen ska fungera på ett bra sätt för dig. Genom att surfa vidare godkänner du att vi använder kakor.  Vad är kakor?