MEASUREMENTS OF PARTICLE NUMBER SIZE DISTRIBUTIONS AND NEW PARTICLE FORMATION EVENTS DURING WINTER IN THE PEARL RIVER DELTA REGION, CHINA

TAN Hao-bo; YIN Yan; LI Fei; LIU Xian-tong; CHAN Pak-wai; DENG Tao; DENG Xue-jiao; WAN Qi-lin; WU Dui

doi:10.16555/j.1006-8775.2016.02.009

Abstract:

Particle number size distribution (PNSD) between 10 nm and 20 μm were measured in the Pearl River Delta(PRD) region in winter 2011. The average particle number concentration of the nucleation mode (10-20 nm), Aitken mode (20-100 nm), accumulation mode (100 nm-1 μm) and coarse mode (1-20 μm) particles were 1 552, 7 470, 4 012, and 19 cm-3, respectively. The volume concentration of accumulation mode particles with peak at 300 nm accounted for over 70% of the total volume concentration. Diurnal variations and dependencies on meteorological parameters of PNSD were investigated. The diurnal variation of nucleation mode particles was mainly influenced by new particle formation events, while the diurnal variation of Aitken mode particles correlated to the traffic emission and the growth process of nucleation mode particles. When the PRD region was controlled by a cold high pressure, conditions of low relative humidity, high wind speed and strong radiation are favorable for the occurrence of new particle formation (NPF) events. The frequency of occurrence of NPF events was 21.3% during the whole measurement period. Parameters describing NPF events, including growth rate (GR) and source rate of condensable vapor (Q), were slightly larger than those in previous literature. This suggests that intense photochemical and biological activities may be the source of condensable vapor for particle growth, even during winter in the PRD.

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TAN Hao-bo, YIN Yan, LI Fei, et al. MEASUREMENTS OF PARTICLE NUMBER SIZE DISTRIBUTIONS AND NEW PARTICLE FORMATION EVENTS DURING WINTER IN THE PEARL RIVER DELTA REGION, CHINA [J]. Journal of Tropical Meteorology, 2016, 22(2): 191-199, https://doi.org/10.16555/j.1006-8775.2016.02.009

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MEASUREMENTS OF PARTICLE NUMBER SIZE DISTRIBUTIONS AND NEW PARTICLE FORMATION EVENTS DURING WINTER IN THE PEARL RIVER DELTA REGION, CHINA

Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction, CMA, Guangzhou 510080 China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing Univers

Rev Recd Date: 2016-02-03

Abstract: Particle number size distribution (PNSD) between 10 nm and 20 μm were measured in the Pearl River Delta(PRD) region in winter 2011. The average particle number concentration of the nucleation mode (10-20 nm), Aitken mode (20-100 nm), accumulation mode (100 nm-1 μm) and coarse mode (1-20 μm) particles were 1 552, 7 470, 4 012, and 19 cm-3, respectively. The volume concentration of accumulation mode particles with peak at 300 nm accounted for over 70% of the total volume concentration. Diurnal variations and dependencies on meteorological parameters of PNSD were investigated. The diurnal variation of nucleation mode particles was mainly influenced by new particle formation events, while the diurnal variation of Aitken mode particles correlated to the traffic emission and the growth process of nucleation mode particles. When the PRD region was controlled by a cold high pressure, conditions of low relative humidity, high wind speed and strong radiation are favorable for the occurrence of new particle formation (NPF) events. The frequency of occurrence of NPF events was 21.3% during the whole measurement period. Parameters describing NPF events, including growth rate (GR) and source rate of condensable vapor (Q), were slightly larger than those in previous literature. This suggests that intense photochemical and biological activities may be the source of condensable vapor for particle growth, even during winter in the PRD.

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MEASUREMENTS OF PARTICLE NUMBER SIZE DISTRIBUTIONS AND NEW PARTICLE FORMATION EVENTS DURING WINTER IN THE PEARL RIVER DELTA REGION, CHINA

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