Application of OMI, SCIAMACHY, and GOME-2 satellite SO2 retrievals for detection of large emission sources

Retrievals of sulfur dioxide (SO2) from space‐based spectrometers are in a relatively early stage of development. Factors such as interference between ozone and SO2 in the retrieval algorithms often lead to errors in the retrieved values. Measurements from the Ozone Monitoring Instrument (OMI), Scan...

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Bibliographic Details
Published in:Journal of geophysical research. Atmospheres 2013-10, Vol.118 (19), p.11,399-11,418
Main Authors: Fioletov, V. E., McLinden, C. A., Krotkov, N., Yang, K., Loyola, D. G., Valks, P., Theys, N., Van Roozendael, M., Nowlan, C. R., Chance, K., Liu, X., Lee, C., Martin, R. V.
Format: Article
Language:English
Subjects:
Anthropogenic factors
Developmental stages
Earth, ocean, space
Emission measurements
emissions
Exact sciences and technology
External geophysics
Filtration
Geophysics
Meteorological satellites
Meteorology
Monitoring instruments
Noise reduction
Ozone
remote sensing
Satellites
Sensors
Spectrometers
Sulfur
Sulfur dioxide
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Summary:Retrievals of sulfur dioxide (SO2) from space‐based spectrometers are in a relatively early stage of development. Factors such as interference between ozone and SO2 in the retrieval algorithms often lead to errors in the retrieved values. Measurements from the Ozone Monitoring Instrument (OMI), Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY), and Global Ozone Monitoring Experiment‐2 (GOME‐2) satellite sensors, averaged over a period of several years, were used to identify locations with elevated SO2 values and estimate their emission levels. About 30 such locations, detectable by all three sensors and linked to volcanic and anthropogenic sources, were found after applying low and high spatial frequency filtration designed to reduce noise and bias and to enhance weak signals to SO2 data from each instrument. Quantitatively, the mean amount of SO2 in the vicinity of the sources, estimated from the three instruments, is in general agreement. However, its better spatial resolution makes it possible for OMI to detect smaller sources and with additional detail as compared to the other two instruments. Over some regions of China, SCIAMACHY and GOME‐2 data show mean SO2 values that are almost 1.5 times higher than those from OMI, but the suggested spatial filtration technique largely reconciles these differences. Key Points Available satellite SO2 data can be used to monitor large emission sources SO2 data from different satellites agree when spatial filtration is applied Instruments with higher spatial resolution can detect smaller emission sources
ISSN:2169-897X
2169-8996
DOI:10.1002/jgrd.50826