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| Titel |
Estimating ground-level PM2.5 in eastern China using aerosol optical depth determined from the GOCI satellite instrument |
| VerfasserIn |
J.-W. Xu, R. V. Martin, A. van Donkelaar, J. Kim, M. Choi, Q. Zhang, G. Geng, Y. Liu, Z. Ma, L. Huang, Y. Wang, H. Chen, H. Che, P. Lin, N. Lin |
| 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 ; 15, no. 22 ; Nr. 15, no. 22 (2015-11-27), S.13133-13144 |
| Datensatznummer |
250120188
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| Publikation (Nr.) |
 copernicus.org/acp-15-13133-2015.pdf |
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| Zusammenfassung |
| We determine and interpret fine particulate matter (PM2.5)
concentrations in eastern China for January to December 2013 at a horizontal
resolution of 6 km from aerosol optical depth (AOD) retrieved from the
Korean geostationary ocean color imager (GOCI) satellite instrument. We
implement a set of filters to minimize cloud contamination in GOCI AOD.
Evaluation of filtered GOCI AOD with AOD from the Aerosol Robotic Network
(AERONET) indicates significant agreement with mean fractional bias (MFB) in
Beijing of 6.7 % and northern Taiwan of −1.2 %. We use a global chemical
transport model (GEOS-Chem) to relate the total column AOD to the
near-surface PM2.5. The simulated PM2.5 / AOD ratio exhibits high
consistency with ground-based measurements in Taiwan (MFB = −0.52 %) and
Beijing (MFB = −8.0 %). We evaluate the satellite-derived PM2.5
versus the ground-level PM2.5 in 2013 measured by the China
Environmental Monitoring Center. Significant agreement is found between
GOCI-derived PM2.5 and in situ observations in both annual averages
(r2 = 0.66, N = 494) and monthly averages (relative RMSE = 18.3 %),
indicating GOCI provides valuable data for air quality studies in Northeast
Asia. The GEOS-Chem simulated chemical composition of GOCI-derived
PM2.5 reveals that secondary inorganics (SO42-,
NO3-, NH4+) and organic matter are the most significant
components. Biofuel emissions in northern China for heating increase the
concentration of organic matter in winter. The population-weighted
GOCI-derived PM2.5 over eastern China for 2013 is 53.8 μg m−3, with 400 million residents in regions that exceed the Interim
Target-1 of the World Health Organization. |
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