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Outline
A two-month observation of atmospheric PM1 in suburban Guangzhou in autumn 2022 was conducted using a Soot-Particle High Resolution Time-of-Flight Aerosol Mass Spectrometer (SP-AMS). Sources apportionment of organic aerosol (OA) was performed using Positive Matrix Factorization (PMF). OA's characteristic component particulate organic nitrates (pON) were quantified and explored. During the observation period, PM[(15.90 ± 12.28) μg/m3] was dominated by organics (57.8%), with major components (excluding sulfate) exhibiting higher nocturnal concentrations than diurnal concentrations. OA was mainly contributedby local secondary formation (28.3%), long-range transport (23.9%), and primary emissions such as cooking, vehicle exhaust, and biomass burning (collectively 47.8%). pON contributed significantly to OA (24.7%), increasing markedly under low total nitrate concentrations. Its nocturnal increase may enhance next-day atmospheric oxidation capacity. pON mainly derived from local secondary formation (51.5%) and vehicle exhaust (39.8%). During high PM events, OA was dominated by local secondary formation and vehicle emissions; during high ozone conditions, organics and sulfate showed pronounced midday peaks (photochemical oxidation), secondary OA contribution rose to 59.8%, and pON was primarily from local secondary formation (60.8%).
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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