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| Titel |
Interannual variation in the fine-mode MODIS aerosol optical depth and its relationship to the changes in sulfur dioxide emissions in China between 2000 and 2010 |
| VerfasserIn |
S. Itahashi, I. Uno, K. Yumimoto, H. Irie, K. Osada, K. Ogata, H. Fukushima, Z. Wang, T. Ohara |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 5 ; Nr. 12, no. 5 (2012-03-08), S.2631-2640 |
| Datensatznummer |
250010867
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| Publikation (Nr.) |
 copernicus.org/acp-12-2631-2012.pdf |
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| Zusammenfassung |
| Anthropogenic SO2 emissions increased alongside economic development in
China at a rate of 12.7% yr−1 from 2000 to 2005. However, under new Chinese
government policy, SO2 emissions declined by 3.9% yr−1 between 2005 and
2009. Between 2000 and 2010, we found that the variability in the fine-mode
(submicron) aerosol optical depth (AOD) over the oceans adjacent to East Asia
increased by 3–8% yr−1 to a peak around 2005–2006 and subsequently decreased
by 2–7% yr−1, based on observations by the Moderate Resolution Imaging
Spectroradiometer (MODIS) on board NASA's Terra satellite and simulations by
a chemical transport model. This trend is consistent with ground-based
observations of aerosol particles at a mountainous background observation
site in central Japan. These fluctuations in SO2 emission intensity and
fine-mode AOD are thought to reflect the widespread installation of fuel-gas
desulfurization (FGD) devices in power plants in China, because aerosol
sulfate is a major determinant of the fine-mode AOD in East Asia. Using a
chemical transport model, we confirmed that the contribution of particulate
sulfate to the fine-mode AOD is more than 70% of the annual mean and that
the abovementioned fluctuation in fine-mode AOD is caused mainly by changes
in SO2 emission rather than by other factors such as varying
meteorological conditions in East Asia. A strong correlation was also found
between satellite-retrieved SO2 vertical column density and bottom-up
SO2 emissions, both of which were also consistent with observed fine-mode
AOD trends. We propose a simplified approach for evaluating changes in SO2
emissions in China, combining the use of modeled sensitivity coefficients
that describe the variation of fine-mode AOD with changes in SO2 emissions
and satellite retrieval. Satellite measurements of fine-mode AOD above the
Sea of Japan marked a 4.1% yr−1 decline between 2007 and 2010, which
corresponded to the 9% yr−1 decline in SO2 emissions from China during the
same period. |
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