Characteristics of Black Carbon at Wuqing Observed by Single Particle Soot Photometer

An Linchang; Sun Junying; Zhang Yangmei; Shen Xiaojing; Wang Tingting; Liang Wende; Chen Lili

Vol.22, NO.5, 2011

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2011 > 22(5): 577-583

An Linchang, Sun Junying, Zhang Yangmei, et al. Characteristics of black carbon at wuqing observed by single particle soot photometer. J Appl Meteor Sci, 2011, 22(5): 577-583.

Citation:

An Linchang, Sun Junying, Zhang Yangmei, et al. Characteristics of black carbon at wuqing observed by single particle soot photometer. J Appl Meteor Sci, 2011, 22(5): 577-583.

An Linchang, Sun Junying, Zhang Yangmei, et al. Characteristics of black carbon at wuqing observed by single particle soot photometer. J Appl Meteor Sci, 2011, 22(5): 577-583.

Citation:

An Linchang, Sun Junying, Zhang Yangmei, et al. Characteristics of black carbon at wuqing observed by single particle soot photometer. J Appl Meteor Sci, 2011, 22(5): 577-583.

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Characteristics of Black Carbon at Wuqing Observed by Single Particle Soot Photometer

1.
Key Laboratory for Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing 100081
2.
Wuqing Meteorological Administration of Tianjin, Tianjin 301700

Received Date: 2010-12-13
Rev Recd Date: 2011-06-15
Publish Date: 2011-10-31

Abstract

Abstract

Black carbon (BC) plays a significant role in climate change, which has attracts increasing research interest. Single Particle Soot Photometer (SP2) is used at Wuqing Meteorological Station in Tianjin. SP2 utilizes the high optical power available intra-cavity from a Nd:YAG laser as the analytical technique. Light absorbing particles, mainly BC in atmosphere, absorb sufficient energy and are heated to the point of incandescence. The energy emitted in this incandescence is measured, and quantitatively determine the mass of the particle. SP2 operates in a single particle mode, measuring the light scattering and incandescence of each particle. Through the time delay between the two signals, the mixing state of BC particles can be obtained. SP2 is different from the traditional filter-based method which could provide more accurate information on single BC particle properties. First, SP2 could count the BC particles individually, so BC number concentration could be given; second, SP2 measures the mass of each BC particle, which could be converted to particle size; finally, SP2 could give the information on BC mixing state, which is important for estimating the aerosol effect on climate change.The observation taken at Wuqing in December 2009 shows that the average number concentration of BC is 1504 cm^-3, with the maximum 5050 cm^-3and the minimum 46.8 cm^-3. The number of BC particles occupies 57.2% of the aerosol particles measured by SP2. The average number concentration of non-absorbing aerosol is 1124 cm^-3, with the maximum 3311 cm^-3and the minimum 70.7 cm^-3. The average mass concentration of BC is 8.15 μg/m³. 51.5% of BC particles are thickly coated. On a clear windy day, the daily average number concentration is 215 cm^-3, the mass concentration is 1.17 μg/m³, and 40.2% of them are mixed. However in the seriously polluted case, the daily average number concentration is 3169 cm^-3, the mass concentration reaches 17.2 μg/m³, and the ratio of mixed BC also increases to 78.7%.
- black carbon;
- single particle soot photometer;
- mixing aerosol;
- air pollution

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References(33)

Figures and Tables

图 1 SP2 LII光信号宽通道峰值与黑碳粒子质量关系标定结果

Fig. 1 Calibration curve of BC mass and the peak height of LII signal of the broadband channel

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图 2 2009年12月武清黑碳气溶胶和非光吸收性气溶胶数浓度变化 (a) 逐日变化, (b) 日变化

Fig. 2 Number concentrations of BC and non-light absorbing aerosols at Wuqing in Dec 2009

(a) daily variation, (b) diurnal variation

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图 3 2009年12月武清黑碳气溶胶粒子粒径分布

Fig. 3 Size distribution of BC at Wuqing in Dec 2009

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图 4 2009年12月武清黑碳气溶胶Δt分布

Fig. 4 Δt distribution of BC at Wuqing in Dec 2009

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图 5 黑碳气溶胶和非光吸收性气溶胶数浓度变化 (a) 个例1，(b) 个例2

Fig. 5 Number concentrations of BC and non-light absorbing aerosols (a) case 1, (b) case 2

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图 6 不同个例黑碳气溶胶粒子粒径分布 (a) 个例1, (b) 个例2

Fig. 6 Size distribution of BC (a) case 1, (b) case 2

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图 7 不同个例黑碳气溶胶Δt分布 (a) 个例1, (b) 个例2

Fig. 7 Δt Distribution of BC (a) case 1, (b) case 2

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