Aerosol size distribution and new particle formation in the western Yangtze River Delta of China : 2 years of measurements at the SORPES station

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Qi , X M , Ding , A J , Nie , W , Petäjä , T , Kerminen , V -M , Herrmann , E , Xie , Y N , Zheng , L F , Manninen , H , Aalto , P , Sun , J N , Xu , Z N , Chi , X G , Huang , X , Boy , M , Virkkula , A , Yang , X -Q , Fu , C B & Kulmala , M 2015 , ' Aerosol size distribution and new particle formation in the western Yangtze River Delta of China : 2 years of measurements at the SORPES station ' , Atmospheric Chemistry and Physics , vol. 15 , no. 21 , pp. 12445-12464 . https://doi.org/10.5194/acp-15-12445-2015

Title: Aerosol size distribution and new particle formation in the western Yangtze River Delta of China : 2 years of measurements at the SORPES station
Author: Qi, X. M.; Ding, A. J.; Nie, W.; Petäjä, T.; Kerminen, V. -M.; Herrmann, E.; Xie, Y. N.; Zheng, L. F.; Manninen, H.; Aalto, P.; Sun, J. N.; Xu, Z. N.; Chi, X. G.; Huang, X.; Boy, M.; Virkkula, A.; Yang, X. -Q.; Fu, C. B.; Kulmala, M.
Contributor organization: Department of Physics
Aerosol-Cloud-Climate -Interactions (ACCI)
Date: 2015
Language: eng
Number of pages: 20
Belongs to series: Atmospheric Chemistry and Physics
ISSN: 1680-7316
DOI: https://doi.org/10.5194/acp-15-12445-2015
URI: http://hdl.handle.net/10138/161553
Abstract: Aerosol particles play important roles in regional air quality and global climate change. In this study, we analyzed 2 years (2011-2013) of measurements of submicron particles (6-800 nm) at a suburban site in the western Yangtze River Delta (YRD) of eastern China. The number concentrations (NCs) of particles in the nucleation, Aitken and accumulation modes were 5300 +/- 5500, 8000 +/- 4400, 5800 +/- 3200 cm(-3), respectively. The NCs of total particles are comparable to those at urban/suburban sites in other Chinese megacities, such as Beijing, but about 10 times higher than in the remote western China. Long-range and regional transport largely influenced number concentrations and size distributions of submicron particles. The highest and lowest accumulation-mode particle number concentrations were observed in air masses from the YRD and coastal regions, respectively. Continental air masses from inland brought the highest concentrations of nucleation-mode particles. New particle formation (NPF) events, apparent in 44% of the effective measurement days, occurred frequently in all the seasons except winter. The frequency of NPF in spring, summer and autumn is much higher than other measurement sites in China. Sulfuric acid was found to be the main driver of NPF events. The particle formation rate was the highest in spring (3.6 +/- 2.4 cm(-3) s(-1)), whereas the particle growth rate had the highest values in summer (12.8 +/- 4.4 nm h(-1)). The formation rate was typically high in relatively clean air masses, whereas the growth rate tended to be high in the polluted YRD air masses. The frequency of NPF events and the particle growth rates showed a strong year-to-year difference. In the summer of 2013, associated with a multi-week heat wave and strong photochemical processes, NPF events occurred with larger frequency and higher growth rates compared with the same period in 2012. The difference in the location and strength of the subtropical high pressure system, which influences the air mass transport pathways and solar radiation, seems to be the cause for year-to-year differences. This study reports, up to now, the longest continuous measurement records of submicron particles in eastern China and helps to achieve a comprehensive understanding of the main factors controlling the seasonal and year-to-year variation of the aerosol size distribution and NPF in this region.
Subject: CONDENSATION NUCLEI PRODUCTION
CONTINENTAL BOUNDARY-LAYER
PARTICULATE AIR-POLLUTION
LONG-TERM OBSERVATIONS
BOREAL-FOREST
FORMATION EVENTS
EASTERN CHINA
ATMOSPHERIC NUCLEATION
GROWTH-RATES
NUMBER
114 Physical sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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