期刊
ATMOSPHERIC ENVIRONMENT
卷 119, 期 -, 页码 45-58出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2015.08.041
关键词
MAX-DOAS; NO2; OMI satellite; Shanghai Expo
资金
- Shanghai Environmental Protection Bureau
- National Natural Science Foundation of China [41275038]
- National High-Technology Research and Development Program of China [2014AA06A508]
- Scientific and Technological Project of Anhui province [1301022083]
- Guy Carpenter Asia-Pacific Climate Impact Centre, City University of Hong Kong [9360126]
- Research Grants Council of Hong Kong [CityU 102912, 9041479]
- Marie Curie Initial Training Network of the European Seventh Framework Programme [607905]
During the Shanghai World Expo 2010 ground based Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) measurements of tropospheric nitrogen dioxide (NO2) were performed to investigate the effects of emission control measures during that time. In this study we measured NO2 using four identical MAX-DOAS instruments in Shanghai from April 2009 to November 2010. We combined our MAX-DOAS data, the Ozone Monitoring Instrument (OMI) satellite observations and meteorological information from the National Centers for Environmental Prediction final reanalysis data (NCEP FNL) in order to investigate the spatial distribution of NO2 over Shanghai and the effects of emission control measures during the Expo. In general, the comparison of cloud screened MAX-DOAS data and OMI observations are in good correlation (Pearson correlation coefficient between 0.67 and 0.93 for the four measurement stations). In addition, we compared the MAX-DOAS and OMI NO2 data from the Shanghai Expo in 2010 to the same time of the year in 2009. The results show that the NO2 columns were reduced up to similar to 30% in the area of central Shanghai during the Expo but no significant reduction of NO2 levels was found in the nearby industrial area. The overall NO2 reduction from May, July and September 2010 ranged from 7.5% to 14.5%, which is comparable to observations in previous studies. Our results revealed that the NO2 reduction was mainly achieved by emission control policies on transportation sources in the city rather than the controls from nearby provinces. (C) 2015 Elsevier Ltd. All rights reserved.
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