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JOURNAL OF ENVIRONMENTAL SCIENCES 71(2018):207-221.Looking for Delta Air Lines flights to Venice VCE? Here you can compare Delta Air Lines flights to Venice from 00 flights. Tian, Xin,et al."Long-term observations of tropospheric NO2, SO2 and HCHO by MAX-DOAS in Yangtze River Delta area, China". JOURNAL OF ENVIRONMENTAL SCIENCES,71,207-221. Tian, Xin.,Xie, Pinhua.,Xu, Jin.,Li, Ang.,Wang, Yang.&Hu, Zhaokun.(2018).Long-term observations of tropospheric NO2, SO2 and HCHO by MAX-DOAS in Yangtze River Delta area, China. Long-term observations of tropospheric NO2, SO2 and HCHO by MAX-DOAS in Yangtze River Delta area, China. National Natural Science Foundation of Chinaġ.Univ Sci & Technol China, Sch Environm Sci & Optoeclect Technol, Hefei 230026, Anhui, Peoples R China 2.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Environm Opt & Technol, Hefei 230031, Anhui, Peoples R China 3.Chinese Acad Sci, Inst Urban Environm, Ctr Excellence Urban Atmospher Environm, Xiamen 361021, Peoples R China 4.Max Planck Inst Chem, D-55128 Mainz, Germany Monitoring and Assessment of Regional Air Quality in China using space Observations, Project Of Long-term sino-5 european co-Operation (MarcoPolo), FP7 National Natural Science Foundation of China MAX-DOAS instrument column densities NO2 HCHO SO2 Yangtze River Delta area Pollution transport (C) 2017 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. The feature is significant in exploring transport of tropospheric trace gas pollution in YRD, and provides basis for satellite and model validation. According to analysis of regional transports of pollutants, pollution process happened in YRD under the north wind with the pollution dissipating in the southeast wind. Tropospheric VCDs of NO2, SO2, and HCHO were compared with those from Ozone Monitoring Instrument (OMI) satellite observations, resulting in R-2 of 0.606, 0.5432, and 0.5566, respectively. In general trace gas concentrations gradually reduced from Shanghai to Hefei. Slight reduction of the pollutants in weekends occurred in all the three sites. Average diurnal variations of tropospheric NO2 and SO2 in different seasons over the three stations yielded minimum values at noon or in the early afternoon, whereas tropospheric HCHO reached the maximum during midday hours. This paper presents technical performance and characteristics of instruments, their distribution in YRD, and results of vertical column densities (VCDs) and profiles of NO2, SO2, and HCHO. Three cities of YRD (Hefei, Nanjing, and Shanghai) were selected for long-term observations.
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In this study, we use ground-based multi-axis differential optical absorption spectroscopy (MAX-DOAS) network in Eastern China to retrieve variations of NO2, SO2, and formaldehyde (HCHO) in the YRD area. However, this area faces increasing environmental problems. Xie, Xu, River Delta (YRD) area is one of the important economic zones in China. Tian, Xin 1,2 Xie, Pinhua 1,2,3 Xu, Jin 2 Li, Ang 2 Wang, Yang 4 Qin, Min 2 Hu, Zhaokun 2 Long-term observations of tropospheric NO2, SO2 and HCHO by MAX-DOAS in Yangtze River Delta area, China