Observation of atmospheric nitrous acid with DOAS in Beijing, China.
Observation of atmospheric nitrous acid with DOAS in Beijing, China.
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发表时间：
2006
影响因子：
6.9
通讯作者：
M. Qin;P. Xie;Wenqing Liu;Ang Li;K. Dou;W. Fang;Jian-guo Liu;Wei-Jun Zhang
中科院分区：
文献类型：
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作者：
M. Qin;P. Xie;Wenqing Liu;Ang Li;K. Dou;W. Fang;Jian-guo Liu;Wei-Jun Zhang
2004年秋季，利用自行研制的基于光电二极管阵列（PDA）的差分光学吸收光谱（DOAS）系统，对北京市大气中的亚硝酸（HONO）和二氧化氮（NO2）进行了测量。利用HONO和NO2在337 ~ 372 nm光谱区的特征吸收带，同时对HONO和NO2进行了定性鉴别，具有较高的灵敏度和时间分辨率。HONO浓度有明显的日变化，夜间最高，白天最低。最高的HONO值高达11.8微克/立方米，在9月2/3日夜间观察到。讨论了观测到的HONO的可能来源。与NO2的相关性较好，表明NO2是主要的源成分。在城市强污染区，HONO的直接排放也是一个重要的污染源。
Measurements of nitrous acid (HONO) and nitrogen dioxide (NO2) in Beijing City have been performed by means of a developed differential optical absorption spectroscopy (DOAS) system based on photodiode array (PDA), during the autumn of 2004. HONO and NO2 were simultaneously identified by their characteristic absorption bands in the spectral region between 337 nm and 372 nm with high sensibility and time resolution. The concentrations of HONO exhibit obviously diurnal variation with a nocturnal maximum and a daytime minimum. The highest HONO value up to 11.8 microg/m3 was observed during the night of 2/3 September. Possible sources of the observed HONO were discussed. Good correlation to NO2 indicates that NO2 is a main source component. The measurement also shows direct emission of HONO is an important source in strongly polluted urban area.