Journal of Geo-information Science >
Spatio-temporal Characteristics of NO2 in China and the Anthropogenic Influences Analysis Based on OMI Data
Received date: 2013-03-01
Revised date: 2013-05-22
Online published: 2013-09-29
Recently, the air quality is deteriorating continuously, do serious harm to human health. As one of the major primary pollutants produced by human activities, real-time monitoring of the spatio-temporal characteristics of NO2 and its content can make a big difference to the air quality studies and public safety warning. This research studied the OMNO2e data between January 2005 and December 2010 from the Ozone Monitoring Instrument and the human society factors in China, explored the spatio-temporal characteristics of NO2 in China and the anthropogenic influences on it. The results showed that: the average NO2 column concentration in China has a significant upward trend from 2005 to 2010, the total column concentration in the atmosphere increased by 0.61×1015 molec/cm2, with an average annual growth rate of 2.47%; while the tropospheric column concentration increased by 0.63×1015 molec/cm2, with an average annual growth rate of 5.69%. The NO2 column concentration in most areas of China increased rapidly, and the growth rate in eastern China was much greater than the less developed regions in western China. The spatial distribution of NO2 in China also shows a significant difference. In general, it presents the characteristic of higher in the east than that in the west. Besides, NO2 column concentration in winter was significantly higher than that in summer in eastern China, but in western, the highest value appears in summer. We also studied the relationship between every season's spatial distribution of TropNO2/Tot-NO2 and the human footprint. The result showed a good consistency between them: the correlation coefficients between TropNO2/TotNO2 and human footprint is maximum in winter, about 0.59; and its minimum value appears in summer, about 0.48. And the number of samples is 56166×2, indicated that the influences from human activities were maximal in winter and minimum in summer. The correlation coefficients between car ownership and TropNO2, gross regional production and TropNO2 had also been calculated. We found that the coefficient between car ownership and TropNO2 is 0.95, with a significance test at 95 percentile of confidence level, and the correlation between gross regional production and TropNO2 also very strong. The increasing of NO2 in China has remarkable relevance with human activities and social economic development.
Key words： anthropogenic influences; OMI; NO2; spatio-temporal distribution
LI Long, SHI Run-He, CHEN Yuan-Yuan, XU Yong-Meng, BAI Kai-Xu, ZHANG Jia . Spatio-temporal Characteristics of NO2 in China and the Anthropogenic Influences Analysis Based on OMI Data[J]. Journal of Geo-information Science, 2013 , 15(5) : 688 -694 . DOI: 10.3724/SP.J.1047.2013.00688
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