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| Insights into characteristics of carbonaceous particles during haze and fog events in Nanjing |
| HU Rui1,2, YIN Yan1,2, CHEN Kui2, WANG Hong-lei1,2, JIANG Hui2, ZHU Bin1,2, HAO Jian2 |
1. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing 210044, China;
2. Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & Technology, Nanjing 210044, China |
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Abstract This study discussed the physicochemical properties of carbonaceous particles in Nanjing from August to September, 2014, using a real-time single particle aerosol mass spectrometry (SPAMS). Single carbonaceous particle mass spectra were grouped into 8types, including EC-fresh, EC-SN, NaK-EC, OC, ECOC, ECOC-S, ECOC-SN and Ammonium. The number fraction of OC in total particles decreased in fog and haze periods while EC-SN and NaK-EC showed the opposite trend, about 2times larger than clean episodes. The reduced rate of the total number fraction of carbonaceous particles in clean episodes > fog > haze.Most particles mixed with more nitrate in fog, meantime, more OC with small diameter were produced in these episodes. The relative acidity ratios (Rva) of EC-SN and NaK-EC in clean episodes < haze < fog, while for OC and ECOC-SN, the Rva reached the maximum during clean episodes. This study is important for further understanding of the sources and evolution of carbonaceous particles under different weather conditions in Nanjing.
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Received: 15 November 2016
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