Size distributions of elemental carbon, organic carbon, and polycyclic aromatic hydrocarbons in ambient aerosols of the Pearl River Delta region

2009 ◽  
Author(s):  
Huan Yu
Keyword(s):  
Aromatic Hydrocarbons ◽  
Pearl River Delta ◽  
Elemental Carbon ◽  
Pearl River ◽  
Size Distributions ◽  
Pearl River Delta Region ◽  
Ambient Aerosols ◽  
The Pearl River Delta ◽  
Polycyclic Aromatic ◽  
The Pearl River

scholarly journals Size distributions of elemental carbon and its contribution to light extinction in urban and rural locations in the pearl river delta region, China

2010 ◽  
Vol 10 (11) ◽  
pp. 5107-5119 ◽  
Author(s):  
H. Yu ◽  
C. Wu ◽  
D. Wu ◽  
J. Z. Yu
Keyword(s):  
Pearl River Delta ◽  
Elemental Carbon ◽  
Light Extinction ◽  
Pearl River ◽  
Size Distributions ◽  
Pearl River Delta Region ◽  
The Pearl River Delta ◽  
Condensation Mode ◽  
Mode Size ◽  
The Pearl River

Abstract. Elemental carbon (EC) in size-segregated aerosol samples were determined at five urban, one suburban, and one rural locations in the Pearl River Delta region in South China during 2006–2008 period. The size modal characteristics of EC were different at the urban and suburban/rural locations. The urban EC had a dominant condensation mode with a mass median aerodynamic diameter (MMAD) in the 0.36–0.43 μm range and a slightly less abundant mode in the droplet mode size (MMAD: 0.8–1.1 μm), while the suburban/rural EC had a prominent mode in the droplet mode size (MMAD: 0.7–1.1 μm) and a minor condensation mode (MMAD: 0.22–0.33 μm). Calculations using Mie theory and the measured size distributions of EC, organic carbon, and major inorganic ions indicate that EC-containing particles contributed 76±20% of the observed light extinction at the urban sites. Among the EC-containing particles, EC mass alone contributed 21±11% of the observed light extinction while non-EC materials on the EC particles (i.e., organic matter, ammonium sulfate, and water) contributed 55±15%. At the suburban/rural locations, EC-containing particles contributed 37–48% of the measured light extinction, with EC mass contributing 4–10% and non-EC coating materials contributing the remaining light extinction. Our results suggest that EC-containing particles were important to the overall light extinction in the urban atmospheres due to their more abundant presence from vehicular emissions. The EC-containing particles in the suburban/rural locations had a reduced but still significant contribution to light extinction budget.

scholarly journals Size distributions of elemental carbon and its contribution to light extinction in urban and rural locations in the Pearl River Delta region, China

2009 ◽  
Vol 9 (5) ◽  
pp. 23021-23050
Author(s):  
H. Yu ◽  
C. Wu ◽  
D. Wu ◽  
J. Z. Yu
Keyword(s):  
Pearl River Delta ◽  
Elemental Carbon ◽  
Light Extinction ◽  
Pearl River ◽  
Size Distributions ◽  
Pearl River Delta Region ◽  
The Pearl River Delta ◽  
Condensation Mode ◽  
Mode Size ◽  
The Pearl River

Abstract. Elemental carbon (EC) in size-segregated aerosol samples were determined at five urban, one suburban, and one rural locations in the Pearl River Delta region in South China during 2006–2008 period. The size modal characteristics of EC were different at the urban and suburban/rural locations. The urban EC had a dominant condensation mode with a mass median aerodynamic diameter (MMAD) in the 0.36–0.43 μm range and a slightly less abundant mode in the droplet mode size (MMAD: 0.8–1.1 μm), while the suburban/rural EC had a prominent mode in the droplet mode size (MMAD: 0.7–1.1 μm) and a minor condensation mode (MMAD: 0.22–0.33 μm). Calculations using Mie theory and the measured size distributions of EC, organic carbon, and major inorganic ions indicate that EC-containing particles contributed 76% of the observed light extinction at the urban sites. Among the EC-containing particles, EC mass alone contributed 21% of the observed light extinction while non-EC materials on the EC particles (i.e. organic matter, ammonia sulfate, and water) contributed 55%. At the suburban/rural locations, EC-containing particles contributed 37–41% of the measured light extinction, with EC mass contributing 4–8% and non-EC coating materials contributing the remaining light extinction. Our results suggest that EC-containing particles were important to the overall light extinction in the urban atmospheres due to their more abundant presence from vehicular emissions. The EC-containing particles in the suburban/rural locations made a reduced but still significant contribution to light extinction budget.

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