Global Climatology of Fine Particulate Matter Concentrations Estimated from Remote-Sensed Aerosol Optical Depth Aaron van Donkelaar1, Randall Martin1,2,

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Presentation transcript:

Global Climatology of Fine Particulate Matter Concentrations Estimated from Remote-Sensed Aerosol Optical Depth Aaron van Donkelaar1, Randall Martin1,2, Ralph Kahn3 and Robert Levy3 AGU Fall Meeting December 13-18, 2009 1Dalhousie University 2Harvard-Smithsonian 3NASA Goddard

Approach Estimated PM2.5 = η· τ η We relate satellite-based measurements of aerosol optical depth to PM2.5 using a global chemical transport model Following Liu et al., 2004: Estimated PM2.5 = η· τ Combined MODIS/MISR Aerosol Optical Depth vertical structure aerosol type meteorological effects meteorology diurnal effects η GEOS-Chem

MODIS and MISR τ τ [unitless] MODIS τ MISR τ MODIS MISR Mean τ 2001-2006 at 0.1º x 0.1º MODIS τ 1-2 days for global coverage Requires assumptions about surface reflectivity MODIS r = 0.40 vs. in-situ PM2.5 MISR τ 6-9 days for global coverage Simultaneous surface reflectance and aerosol retrieval MISR r = 0.54 vs. in-situ PM2.5 τ [unitless] 0 0.1 0.2 0.3

Agreement varies with surface type July MODIS MISR 9 surface types, defined by monthly mean surface albedo ratios, evaluation against AERONET AOD

Combining MODIS and MISR improves agreement 0.3 0.25 0.2 0.15 0.1 0.05 Combined MODIS/MISR r = 0.63 (vs. in-situ PM2.5) τ [unitless] MODIS r = 0.40 (vs. in-situ PM2.5) MISR r = 0.54 (vs. in-situ PM2.5)

Global CTMs can directly relate PM2.5 to τ η [ug/m] Detailed aerosol-oxidant model 2º x 2.5º 54 tracers, 100’s reactions Assimilated meteorology Year-specific emissions Dust, sea salt, sulfate-ammonium-nitrate system, organic carbon, black carbon, SOA GEOS-Chem

Significant agreement with coincident ground measurements over NA MODIS τ 0.40 MISR τ 0.54 Combined τ 0.63 Combined PM2.5 0.78 Annual Mean PM2.5 [μg/m3] (2001-2006) Satellite Derived Satellite-Derived [μg/m3] In-situ In-situ PM2.5 [μg/m3]

Method is globally applicable Annual mean measurements Outside Canada/US 244 sites (84 non-EU) r = 0.83 (0.91) slope = 0.86 (0.84) bias = 1.15 (-2.52) μg/m3

High global PM2.5 exposure WHO Guideline AQG IT-3 IT-2 IT-1 100 90 80 70 60 50 40 30 20 10 Satellite-PM2.5 + population map → exposure 80% of world population exceeds WHO guideline of 10 μg/m3 49% of eastern Asia exceeds 35 μg/m3 Population [%] 5 10 15 25 35 50 100 PM2.5 Exposure [μg/m3]