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Global Chemical Composition of Ambient Fine Particulate Matter for Exposure Assessment
journal contribution
posted on 2015-12-17, 05:50 authored by Sajeev Philip, Randall V. Martin, Aaron van Donkelaar, Jason Wai-Ho Lo, Yuxuan Wang, Dan Chen, Lin Zhang, Prasad
S. Kasibhatla, Siwen Wang, Qiang Zhang, Zifeng Lu, David G. Streets, Shabtai Bittman, Douglas J. MacdonaldEpidemiologic
and health impact studies are inhibited by the paucity
of global, long-term measurements of the chemical composition of fine
particulate matter. We inferred PM2.5 chemical composition
at 0.1° × 0.1° spatial resolution for 2004–2008
by combining aerosol optical depth retrieved from the MODIS and MISR
satellite instruments, with coincident profile and composition information
from the GEOS-Chem global chemical transport model. Evaluation of
the satellite-model PM2.5 composition data set with North
American in situ measurements indicated significant spatial agreement
for secondary inorganic aerosol, particulate organic mass, black carbon,
mineral dust, and sea salt. We found that global population-weighted
PM2.5 concentrations were dominated by particulate organic
mass (11.9 ± 7.3 μg/m3), secondary inorganic
aerosol (11.1 ± 5.0 μg/m3), and mineral dust
(11.1 ± 7.9 μg/m3). Secondary inorganic PM2.5 concentrations exceeded 30 μg/m3 over
East China. Sensitivity simulations suggested that population-weighted
ambient PM2.5 from biofuel burning (11 μg/m3) could be almost as large as from fossil fuel combustion sources
(17 μg/m3). These estimates offer information about
global population exposure to the chemical components and sources
of PM2.5.
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chemical compositionMODISestimates offer informationhealth impact studieschemical transport modelpopulation exposureSensitivity simulationssea saltchemical componentscomposition informationExposure AssessmentEpidemiologicmineral dustAmbient Fine Particulate MatterPM 2.5 concentrationsNorth AmericanEast ChinaMISR satellite instrumentsPM 2.5 chemical compositionGlobal Chemical Compositionaerosol
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