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Schlagwörter:
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Zusammenfassung:
To evaluate the real reductions in sulfur dioxide (SO2) emissions from
coal-fired power plants in China, Ozone Monitoring Instrument (OMI)
remote sensing SO2 columns were used to inversely model the SO2 emission
burdens surrounding 26 isolated power plants before and after the
effective operation of their flue gas desulfurization (FGD) facilities.
An improved two-dimensional Gaussian fitting method was developed to
estimate SO2 burdens under complex background conditions, by using the
accurate local background columns and the customized fitting domains for
each target source. The OMI-derived SO2 burdens before effective FGD
operation were correlated well with the bottom-up emission estimates (R
= 0.92), showing the reliability of the OMI-derived SO2 burdens as a
linear indicator of the associated source strength. OMI observations
indicated that the average lag time period between installation and
effective operation of FGD facilities at these 26 power plants was
around 2 years, and no FGD facilities have actually operated before the
year 2008. The OMI estimated average SO2 removal equivalence (56.0%) was
substantially lower than the official report (74.6%) for these 26 power
plants. Therefore, it has been concluded that the real reductions of SO2
emissions in China associated with the FGD facilities at coal-fired
power plants were considerably diminished in the context of the current
weak supervision measures.
