光谱学与光谱分析, 2011, 31 (3): 789, 网络出版: 2011-08-16
基于扫描DOAS系统对北京城市大气中甲醛的梯度测量与分析
Atmospheric HCHO Gradient Monitoring and Analysis in Beijing City with a Scanning DOAS System
摘要
利用扫描长程DOAS(差分吸收光谱技术)系统结合气象高塔于2009年7月28日至8月13日开展了测量大气污染物廓线的外场实验, 对北京市大气中的SO2, NO2, O3, HCHO, HONO五种痕量气体进行实时监测, 获得了HCHO等污染物的浓度时间序列及垂直梯度时间序列。 通过分析HCHO气体的垂直分布频率特征, 并结合其他气体及气象数据讨论了大气中HCHO主要来源问题, 监测站点附近大气HCHO的来源中交通排放的一次来源占了很大的比重, 而光化学反应产生的二次来源在每天的特定时段(中午左右的几个小时)对环境HCHO的浓度有较大的贡献。
Abstract
Scanning differential optical absorption spectroscopy (DOAS) technique combined with meteorological tower was used for monitoring vertical profiles of SO2, NO2, O3, HCHO and HONO along three light paths in Beijing City during July 28, 2009 to August 13, 2009. As a result, the time series of concentrations and vertical gradient of HCHO as well as other gases were acquired. By analyzing the vertical distribution frequency characteristics of HCHO, data of other gases and meteorological data, it was concluded that the main source of HCHO is vehicles emissions around the measurement site. The photochemical reaction as the secondary source accounts for a significant proportion of the source of HCHO at certain times of day (around noon, for a few hours).
王曼华, 谢品华, 秦敏, 窦科, 王界, 李昂, 徐晋, 石鹏, 吴丰成. 基于扫描DOAS系统对北京城市大气中甲醛的梯度测量与分析[J]. 光谱学与光谱分析, 2011, 31(3): 789. WANG Man-hua, XIE Pin-hua, QIN Min, OU Ke, WANG Jie, LI Ang, XU Jin, SHI Peng, WU Feng-cheng. Atmospheric HCHO Gradient Monitoring and Analysis in Beijing City with a Scanning DOAS System[J]. Spectroscopy and Spectral Analysis, 2011, 31(3): 789.