Guan Lu, Ding Cheng, Zhang Yu-Xiu, Hu Jian-Lin, Yu Xing-Na
Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing 210044, China.
Jiangsu Key Laboratory of High Technology for Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China.
Huan Jing Ke Xue. 2022 Jun 8;43(6):2888-2894. doi: 10.13227/j.hjkx.202110026.
The seasonal variation characteristics of water-soluble organic nitrogen (WSON) in PM were analyzed in the Nanjing Jiangbei new area. The relationship between WSON and water-soluble inorganic nitrogen (WSIN) was also discussed. The results showed that the variation range of WSON in PM was 0.446 to 4.200 μg·m, with an average value of 2.04 μg·m. This value was slightly higher than the observed results in Beijing, Shanghai, and Changzhou. The average value of WSON was the highest in autumn[(2.967±0.643) μg·m], which was approximately 1.7 times that of the other three seasons. The average contribution ratio of WSON to water-soluble total nitrogen (WSTN) in fine particles of Nanjing accounted for 25%, with high ratios in summer-autumn and low ratios in winter-spring. For example, the proportion of WSON/WSTN in winter was only approximately 50% of that in summer and autumn. WSON had the highest correlation with NO-N and the lowest correlation with NO-N in WSIN, which may be related to the volatilization of NO-N caused by high temperatures in summer. Principal component analysis (PCA) showed that WSON of PM in Nanjing was mainly derived from secondary transformation, sea salt, dust, and biomass combustion.
对南京江北新区大气颗粒物中水溶性有机氮（WSON）的季节变化特征进行了分析，并探讨了WSON与水溶性无机氮（WSIN）之间的关系。结果表明，大气颗粒物中WSON的变化范围为0.446至4.200μg·m，平均值为2.04μg·m。该值略高于北京、上海和常州的观测结果。WSON平均值在秋季最高[（2.967±0.643）μg·m]，约为其他三个季节的1.7倍。南京细颗粒物中WSON对水溶性总氮（WSTN）的平均贡献率为25%，夏秋季节比例较高，冬春季节比例较低。例如，冬季WSON/WSTN的比例仅约为夏秋季节的50%。WSON与WSIN中的NO-N相关性最高，与NO-N相关性最低，这可能与夏季高温导致的NO-N挥发有关。主成分分析（PCA）表明，南京大气颗粒物中的WSON主要来源于二次转化、海盐、扬尘和生物质燃烧。
