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Temporal variation of urban NO x concentration in India during the past decade as observed from space
Scanning Imaging Absorption Spectrometer for Atmospheric Cartography (SCIAMACHY) tropospheric NO 2 retrievals (average during March-April-May 2003-2006) were used to locate the major urban sources of NO 2 in India. To show that tropospheric NO 2 measurements from satellites can provide useful inform...
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Published in: | International journal of remote sensing 2011-02, Vol.32 (3), p.849-861 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Scanning Imaging Absorption Spectrometer for Atmospheric Cartography (SCIAMACHY) tropospheric NO
2
retrievals (average during March-April-May 2003-2006) were used to locate the major urban sources of NO
2
in India. To show that tropospheric NO
2
measurements from satellites can provide useful information on day-to-day changes in urban NO
2
concentration, we compared 2-year (October 2004-October 2006) records of surface air NO
2
concentrations obtained at one of the measurement sites in Delhi to retrievals of tropospheric NO
2
columns from Ozone Monitoring Instrument (OMI) observations. The quality of correlation between satellite observations at the urban scale and surface measurements (45%) provided confidence to investigate the temporal changes in the local emission over major urban locations. Combined Global Ozone Monitoring Experiment (GOME) and SCIAMACHY measurements for the period March 1996-December 2007 were used to compute the trends over the selected urban locations. A statistical analysis was applied to derive trends for this period over these locations. The time series of the monthly NO
2
columns for these 11 years were fitted with a linear function superposed on an annual seasonal cycle. We found a statistically significant increase in tropospheric NO
2
levels over the major urban cities in India. Notable urban locations of positive trends were found to be the cities where the urban population is growing rapidly. |
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ISSN: | 0143-1161 1366-5901 |
DOI: | 10.1080/01431161.2010.517797 |