Meng De-You, Cao Fang, Zhai Xiao-Yao, Zhang Shi-Chun, Zhang Yan-Lin
School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China.
International Joint Laboratory on Climate and Environment Change(ILCEC), Yale-NUIST Center on Atmospheric Environment, Nanjing 210044, China.
Huan Jing Ke Xue. 2020 Jun 8;41(6):2547-2554. doi: 10.13227/j.hjkx.201911026.
To investigate the effect of biomass burning in Changchun in autumn on the absorbance of water-soluble organic carbon (WSOC) on PM, PM samples were collected from October to November 2017. The light absorption characteristics of WSOC, carbonaceous components, and carbohydrate content in PM were analyzed. The study showed that the average concentrations of WSOC, organic carbon (OC), and elemental carbon (EC) in PM in Changchun were (10.12±3.47), (17.07±5.64), and (1.34±0.75) μg·m, respectively; the average contribution rate of secondary organic carbon (SOC) to OC was 38.93%. The total sugar concentration in Changchun is (1049.39±958.85) ng·m, of which the content of anhydroglucose (L-glucan, galactan, and mannan), as a biomass burning tracer in total sugar, was 91.69%. The results of sugar correlation analysis showed that biomass combustion was the main source of contribution to carbohydrates in the autumn of Changchun. The light absorption wavelength index of WSOC in autumn was 5.75±1.06, and the unit mass absorption efficiency was (1.23±0.28) m·g, indicating that biomass combustion has an important influence on WSOC absorbance. The biomass combustion characteristic source parameter was used to quantify the contribution of biomass burning to WSOC concentration, which was found to be 58.82%, while the contribution to total WSOC light absorption was 40.92%.
为研究秋季长春市生物质燃烧对细颗粒物（PM）中水溶性有机碳（WSOC）吸光度的影响，于2017年10月至11月采集了PM样本。分析了PM中WSOC的光吸收特性、碳质成分及碳水化合物含量。研究表明，长春市PM中WSOC、有机碳（OC）和元素碳（EC）的平均浓度分别为（10.12±3.47）、（17.07±5.64）和（1.34±0.75）μg·m；二次有机碳（SOC）对OC的平均贡献率为38.93%。长春市总糖浓度为（1049.39±958.85）ng·m，其中作为生物质燃烧示踪剂的脱水葡萄糖（左旋葡聚糖、半乳聚糖和甘露聚糖）含量占总糖的91.69%。糖类相关性分析结果表明，生物质燃烧是长春市秋季碳水化合物的主要贡献来源。秋季WSOC的光吸收波长指数为5.75±1.06，单位质量吸收效率为（1.23±0.28）m·g，表明生物质燃烧对WSOC吸光度有重要影响。利用生物质燃烧特征源参数量化生物质燃烧对WSOC浓度的贡献，发现其贡献率为58.82%，而对WSOC总光吸收的贡献率为40.92%。
