V4.NA.01
North American Estimates
- retired -
We estimate ground-level fine particulate matter (PM₂.₅) over North America by combining a 0.01 degree x 0.01 degree resolution optimal estimate-based Aerosol Optical Depth (AOD) retrieval from the NASA MODIS instrument with aerosol vertical profile and scattering properties simulated by the GEOS-Chem chemical transport model. We then use a geographically weighted regression (GWR) that incorporates ground-based observations to adjust for any residual bias in the satellite-derived PM₂.₅ estimates. Value prior to 2004 use apply the temporal variation of Boys et al., to the GWR-adjusted period.
Reference:
van Donkelaar, A., R. V. Martin, R. J. D. Spurr and R. T. Burnett, High-resolution satellite-derived PM2.5 from optimal estimation and geographically weighted regression over North America, Environ. Sci. and Tech., doi 10.1021/acs.est.5b02076 [Link]
Boys, B.L., Martin, R.V., van Donkelaar, A., MacDonell, R., Hsu, N.C., Cooper, M.J., Yantosca,R.M., Lu, Z., Streets,D.G., Zhang,Q., Wang,S., Fifteen-year global time series of satellite-derived fine particulate matter, Environ. Sci. Technol, 10.1021/es502113p, 2014. [Link]
Google Earth Datasets:
A small selection of regional Mean Satellite-Derived PM₂.₅ estimates have been cut for import into Google Earth. Click on placemarks labelled ‘PM₂.₅′ for the legend.
Satellite-Derived PM₂.₅ with GWR, North America, 3-yr mean, at 35%RH [ug/m3] [.kmz]
Scientific Datasets:
Global resolved datasets are provided in an ArcGIS-compatible ASCII file. Other extractions can often be produced upon request.
Note that these estimates are primarily intended to aid in large-scale studies. Gridded datasets are provided to allow users to agglomerate data as best meets their particular needs. Datasets are gridded at the finest resolution of the information sources that were incorporated, but do not fully resolve PM₂.₅ gradients at the gridded resolution due to influence by information sources at coarser resolution.
Satellite-Derived PM₂.₅ with GWR, North America, 3-yr mean, at 35%RH [µg/m3] Resolved [.asc.zip]
SatPM₂.₅ data V4.NA.01 are licensed under CC BY 4.0