Estimating global climatological PM 2.5 from MODIS and MISR AOD Aaron van Donkelaar and Randall Martin April 2009.

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Presentation transcript:

Estimating global climatological PM 2.5 from MODIS and MISR AOD Aaron van Donkelaar and Randall Martin April 2009

Health impacts of PM 2.5 motivate measurements beyond the current, sparse networks outside North America Estimated PM 2.5 = η· τ vertical structure aerosol type meteorological effects meteorology η Combined MODIS/MISR Aerosol Optical Depth GEOS-Chem ~v & Satellite (subgrid variation Lamsal et al., 2008) Approach Following Liu et al., 2004:

Significant agreement with coincident ground measurements over NA Satellite Derived Measured Satellite-Derived [ μ g/m3] Measured PM 2.5 [μg/m 3 ] Annual Mean PM 2.5 [ μ g/m 3 ] ( ) r MODIS τ 0.40 MISR τ 0.54 Combined τ 0.63 Combined PM

Annual mean measurements –Outside Canada/US –295 sites (105 non-EU) r = 0.70 (0.72) slope = 0.77 (0.81) bias = 0.86 (-0.80) μg/m 3 Agreement is global

In-situ agrees better with satellite-derived PM 2.5 Annual mean measurements –295 sites (105 non-EU) 0.1ºx0.1º r = 0.70 (0.72) slope = 0.77 (0.81) bias = 0.86 (-0.80) μg/m 3 2ºx2.5º r = 0.39 (0.52) slope = 0.38 (0.37) bias = 7.29 (4.20) μg/m 3 2ºx2.5º r = 0.62 (0.68) slope = 0.44 (0.47) bias = 4.40 (2.16) μg/m 3 GEOS-Chem Satellite-Derived

τ(z)/τ surface Altitude [km] Error Estimate Two sources –Satellite ( %) –Model (vertical profile) Compare CALIPSO and model extinction profile –Jun-Dec 2006 –Compare % within boundary layer Mean coincident error of ±(5 μg/m %) Contains 95.1% of NA data Model (GC) CALIPSO (CAL) Optical Depth from TOA Optical Depth from TOA to surface Boundary Layer Fraction within Boundary Layer

Satellite-Derived PM 2.5 [μg/m 3 ]

PM2.5 exposure related to life expectancy –0.61±0.20 years lost per 10 μg/m 3 [Pope et al., 2009] Satellite-PM population map + lost-life relationship → –Global estimate of decreased life expectancy due to PM 2.5 exposure Loss in Expected Lifetime [years] PM 2.5 Exposure [μg/m 3 ] Population [%] Satellite-PM 2.5 can assess global impact of PM 2.5