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| Physical and chemical characteristics and potential source region distribution of aerosols over the northern suburb of Nanjing, during autumn |
| GONG Yu-lin1,2, YIN Yan1,2, CHEN Kui2, WANG Hong-lei1, AN Jun-lin1, HU Rui1,2 |
1. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China;
2. Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing 210044, China |
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Abstract Single particle aerosol mass spectrometry (SPAMS) was deployed to continuously observe the ambient aerosols over the suburb of Nanjing during the autumn of 2015. 4groups of particles were selected:EC-rich particles (EC), OC-rich particles (OC), K-rich particles (K-rich) and Metal-rich particles (Metal), accounting for 29.39%, 9.53%, 26.55% and 8.54% of total number, respectively. The particle number and size distribution of 4groups were analyzed under different weather conditions. Backward trajectory model and concentration weighted trajectory method were employed to obtain the potential source region of particles. The results showed that, the average number of total particles were about 2900, 1300, 6450 and 5950h-1, for clean, rainy clean, polluted, and rainy polluted days. The number of all groups of particles increased significantly and their size distribution shifted to larger size, except for OC. Heavy precipitation have obvious scavenging effects on all groups of particles, especially for the large size. However, the effects varied with particle size and were not notable in the rainy polluted days. Particles carried by the air mass from different source regions have different number and categories of fine particles. Oceanic air mass was mainly cleaner than continental air mass. Air mass was significantly influenced by the local emissions when it passed through the land. The potential source region of the fine particles were mainly located locally in Nanjing and southwest areas, around Ma'anshan of Anhui Province. The potential source region of 4groups of particles had distinct spatial distribution.
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Received: 02 May 2017
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