Size Resolved Aerosol OC, EC at a Regional Background Station in the Suburb of Beijing

Yan Peng; Huan Ning; Zhang Yangmei; Zhou Huaigang

Vol.23, No.3,

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Journal of Applied Meteorological Science > 2012 > 23(3): 285-293.

Yan Peng, Huan Ning, Zhang Yangmei, et al. Size resolved aerosol OC, EC at a regional background station in the suburb of Beijing. J Appl Meteor Sci, 2012, 23(3): 285-293. .

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Yan Peng, Huan Ning, Zhang Yangmei, et al. Size resolved aerosol OC, EC at a regional background station in the suburb of Beijing. J Appl Meteor Sci, 2012, 23(3): 285-293. .

Citation:

Yan Peng, Huan Ning, Zhang Yangmei, et al. Size resolved aerosol OC, EC at a regional background station in the suburb of Beijing. J Appl Meteor Sci, 2012, 23(3): 285-293. .

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Size Resolved Aerosol OC, EC at a Regional Background Station in the Suburb of Beijing

1.
CMA Meteorological Observation Center, Beijing 100081
2.
Chinese Academy of Meteorological Sciences, Beijing 100081
3.
Beijing Municipal Environmental Bureau, Beijing 100080
4.
Shangdianzi Atmospheric Background Station, Beijing 101507

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Abstract

Abstract

Carbonaceous aerosols constitute major component of atmospheric aerosols. In Feburay, May, July and September of 2004, size resolved aerosol sampling measurements are conducted respectively at Shangdianzi Regional Atmospheric Background Monitoring Station which is in the suburb of Beijing, to represent the four seasons of the year. OC, EC are analyzed in the lab with Sunset OC/EC Analyzer (NIOSH TOT method, Sunset Lab, USA). The seasonal variations and size distributions of OC and EC composition are characterized, and correlations between OC and EC are discussed as well. The analysis shows that the mean concentration of OC for TSP (Total Suspend Particles) at Shangdianzi Station in the four seasons ranges from 7.5 μg·m^-3 to 31.5 μg·m^-3, and EC ranges from 1.4 μg·m^-3 to 6.6 μg·m^-3. As to PM_2.1 (particles with aerodynamic diameter less than 2.1 μm), the mean concentrations are from about 4.0 μg·m^-3 to 19.1 μg·m^-3 for OC, and from about 0.8 μg·m^-3 to 4.3 μg·m^-3 for EC. The significant seasonal variations of mean OC, EC at Shangdianzi are found with the highest OC and EC concentration appearing in winter and lowest in summer. The size distributions of OC and EC at the Shangdianzi Station shows obvious seasonal differences, with OC and EC peak size at 0.65—2.1 μm during the winter, summer and fall time, and shifts to 2.1—4.7 μm during the spring time. In summer and fall, the OC and EC are mostly concentrated in the fine particles (with particle size less than 2.1 μm). In spring, the size distributions of OC and EC are quite different, where there is a significant enhancement OC, EC mass contents in the coarse particles, which is related to the collision of carbonaceous aerosols with dust particles rich in the spring atmosphere. The mass of organic matter ([OM]=1.4[OE]) in PM_2.1 accounts for about 43%—80% of the total mass of OM, and EC in PM_2.1 accounts for 54%—70% of total EC. The average ratio of OC and EC for the whole period of sampling is about 4.0—6.0, which is similar with the reported values obtained at many urban sites of China, when considering the difference between the OC, EC laboratory analysis methods. The square correlation coefficients (R²) between OC and EC in winter, spring and fall are 0.84, 0.81, and 0.73 respectively. However, the correlation coefficient is lowest in summer, with R² about 0.49. This seasonal pattern of correlations indicates the complications for sources and production or removal processes of the carbonaceous aerosols in summer time in that region.
- aerosol,
- organic carbon (OC),
- elemental carbon (EC),
- size distributions

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Fig 1. Map of Shangdianzi Station and the major cities in the region

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Fig 2. Size distributions of aerosol mass concentrations with OC and EC in different seasons in 2004

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Fig 3. The size spectra of OC and EC mass concentrations in different seasons in 2004

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Fig 4. The ratios (r) of OC to EC mass concentrations with their correlations in different seasons in 2004

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Table 1 Mass concentrations and ratios of OC and EC, and percentages of OC and OM in their respective total mass for TSP, PM₁₁, and PM_2.1 in different seasons at Shangdianzi Station

气溶胶粒子	采样日期	平均值 (标准差)/(μg·m^-3)	OC平均值 (标准差)/(μg·m^-3)	EC平均值 (标准差)/(μg·m^-3)	TC平均值 (标准差)/(μg·m^-3)	OC质量百分比/%	OM质量百分比/%
TSP	2004-02	155.96(105.75)	31.52(20.85)	6.64(5.53)	38.17(26.27)	20.2	28.3
	2004-05	110.44(54.38)	9.50(3.35)	1.44(0.82)	10.95(4.13)	8.6	12.0
	2004-07	91.42(55.58)	7.56(3.43)	1.90(1.09)	9.47(4.26)	8.3	11.6
	2004-09	143.57(68.29)	20.51(11.25)	3.92(1.46)	24.43(12.51)	14.3	20.0
PM₁₁	2004-02	135.15(98.04)	26.87(18.71)	5.93(5.29)	32.80(23.83)	19.9	27.8
	2004-05	85.38(48.25)	7.05(2.55)	1.28(0.78)	8.33(3.29)	8.3	11.6
	2004-07	85.10(53.68)	6.77(3.04)	1.66(0.87)	8.43(3.71)	8.0	11.1
	2004-09	133.95(66.31)	19.36(11.04)	3.54(1.37)	22.90(12.22)	14.5	20.2
PM_2.1	2004-02	76.86(65.59)	19.11(14.45)	4.33(3.81)	23.44(18.17)	24.9	34.8
	2004-05	33.40(20.92)	4.09(1.60)	0.78(0.43)	4.88(2.00)	12.3	17.2
	2004-07	66.01(44.46)	5.07(2.66)	1.26(0.66)	6.33(3.16)	7.7	10.8
	2004-09	92.77(51.25)	16.37(10.36)	2.74(1.12)	19.11(11.27)	17.6	24.7

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Table 2 The correlations between OC and EC for PM_2.1 at Shangdianzi Station and the comparisons with the results (for PM_2.5) observed in other regions of China

地点	时间	R²	比值	分析方法	文献来源
广州新垦	2002-04	0.57	7.38	NIOSH TOT	刘新民等^[41]
广州新垦	2002-11	0.83	5.08	NIOSH TOT	刘新民等^[41]
广州	2002-04	0.81	5.46
广州	2002-11	0.95	8.69
北京	1999-07—2000-06		2.72	IMPROVE TOR	Yang等^[18]
上海	1999-03—2000-03		2.39
北京	2003-01	0.94	1.87	R & P 5400	Yu等^[19]
北京	2003-08	0.81	2.39	R & P 5400	Yu等^[19]
北京	2004年冬季	0.82	4.36	NIOSH TOT	郇宁等^[40]
珠江三角洲	2002年冬季	0.82	2.5	IMPROVE TOR	Cao等^{[17, 30]}
珠江三角洲	2002年夏季	0.63	2.5	IMPROVE TOR	Cao等^{[17, 30]}
太原	2005-12—2006-02		7.0	NIOSH TOT	孟昭阳等^[23]
北京上甸子	2004-02	0.94	4.4	NIOSH TOT	本研究
	2004-05	0.81	5.2
	2004-07	0.49	4.0
	2004-09	0.63	6.0

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Received : 2011-09-15
Accepted : 2012-02-03
Published : 2012-06-29

Size Resolved Aerosol OC, EC at a Regional Background Station in the Suburb of Beijing

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