Zhang Xinghua, Zhang Yangmei, Sun Junying, Yu Yangchun, Canonaco Francesco, Prévôt Andre S H, Li Gang
Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Key Laboratory of Arid Climatic Change and Disaster Reduction of CMA, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China; State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China.
State Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing 100081, China.
Environ Pollut. 2017 Mar;222:567-582. doi: 10.1016/j.envpol.2016.11.012. Epub 2017 Jan 9.
An Aerodyne quadrupole aerosol mass spectrometry (Q-AMS) was utilized to measure the size-resolved chemical composition of non-refractory submicron particles (NR-PM) from October 27 to December 3, 2014 at an urban site in Lanzhou, northwest China. The average NR-PM mass concentration was 37.3 μg m (ranging from 2.9 to 128.2 μg m) under an AMS collection efficiency of unity and was composed of organics (48.4%), sulfate (17.8%), nitrate (14.6%), ammonium (13.7%), and chloride (5.7%). Positive matrix factorization (PMF) with the multi-linear engine (ME-2) solver identified six organic aerosol (OA) factors, including hydrocarbon-like OA (HOA), coal combustion OA (CCOA), cooking-related OA (COA), biomass burning OA (BBOA) and two oxygenated OA (OOA1 and OOA2), which accounted for 8.5%, 20.2%, 18.6%, 12.4%, 17.8% and 22.5% of the total organics mass on average, respectively. Primary emissions were the major sources of fine particulate matter (PM) and played an important role in causing high chemically resolved PM pollution during wintertime in Lanzhou. Back trajectory analysis indicated that the long-range regional transport air mass from the westerly was the key factor that led to severe submicron aerosol pollution during wintertime in Lanzhou.
2014年10月27日至12月3日，在中国西北部兰州市的一个城市站点，使用一台Aerodyne四极杆气溶胶质谱仪（Q-AMS）来测量非难熔亚微米颗粒物（NR-PM）的粒径分辨化学成分。在AMS收集效率为1的情况下，NR-PM的平均质量浓度为37.3 μg/m³（范围为2.9至128.2 μg/m³），其成分包括有机物（48.4%）、硫酸盐（17.8%）、硝酸盐（14.6%）、铵（13.7%）和氯化物（5.7%）。使用多线性引擎（ME-2）求解器的正定矩阵因子分解（PMF）识别出六个有机气溶胶（OA）因子，包括类烃有机气溶胶（HOA）、煤炭燃烧有机气溶胶（CCOA）、烹饪相关有机气溶胶（COA）、生物质燃烧有机气溶胶（BBOA）以及两个氧化有机气溶胶（OOA1和OOA2），它们分别平均占总有机物质量的8.5%、20.2%、18.6%、12.4%、17.8%和22.5%。一次排放是细颗粒物（PM）的主要来源，并且在造成兰州冬季高化学分辨PM污染方面发挥了重要作用。后向轨迹分析表明，来自西风带的长距离区域输送气团是导致兰州冬季严重亚微米气溶胶污染的关键因素。
