Satellite Remote Sensing of NO 2 as an Indicator of Aerosol Pollution: Opportunities from GEMS (and GOCI) Observations Randall Martin with contributions.

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Presentation transcript:

Satellite Remote Sensing of NO 2 as an Indicator of Aerosol Pollution: Opportunities from GEMS (and GOCI) Observations Randall Martin with contributions from Aaron van Donkelaar, Shailesh Kharol, Matthew Cooper, Sajeev Philip Lok Lamsal (Dalhousie  NASA) 3 rd GEMS Workshop Seoul, Korea 9 Oct 2012

Outdoor Air Pollution is Projected to Become the Top Cause of Environmentally Related Deaths Worldwide: Need to Understand and Observe Particulate Matter and Sources OECD, 2012 NOx (GEMS NO 2 ), VOCs (GEMS HCHO) GEMS SO 2 & NO 2 ???

General Approach to Estimate Surface Concentration S → Surface Concentration Ω → Tropospheric column Coincident Model (GEOS-Chem) Profile Encouraging Consistency of Simulated and Measured Profiles Daily Satellite AOD and NO 2 Column Aerosol Extinction SO 2 NO 2 Martin et al., JGR, 2004Lee et al., JGR, 2009 van Donkelaar et al., EHP, 2010 Optical depth above altitude z Total column optical depth Concentration Altitude In Situ GEOS-Chem GEOS-Chem (GC) Caliop (CAL)

Global Climatology ( ) of PM 2.5 Derived from MODIS & MISR AOD van Donkelaar et al., EHP, 2010 Evaluation for US/Canada r=0.77 slope=1.07 n=1057 Number sitesCorrelationSlope Including Europe Excluding Europe Evaluation with measurements outside Canada/US EHP Paper of the Year

Mortality not well explained by PM 2.5 and O 3 alone Mortality can be more strongly associated with NO 2 than either PM 2.5 or O 3 (e.g. Stieb et al. 2007) NO 2 is an indicator of exposure to combustion sources that increase airmass toxicity (Brook et al., 2007) Multiple Pollutants Affect Air Quality

NO 2 : Indicator of Population Exposure to Combustion Sources OMI-Derived NO 2 Lamsal et al., ES&T, in prep

Log 10 of population (millions) Log 10 of NO 2 Mixing Ratio (ppbv) Similar slopes for NO x emissions vs population β=0.35 β=0.41 β=0.70 β=0.30

A Satellite-Based Multipollutant Index from PM 2.5 & NO 2 Cooper et al., ES&T, 2012 PM 2.5 NO 2 MPI Multipollutant Index Satellite-Based Multipollutant Index (Unitless) Shanghai Beijing Delhi Karachi Seoul Cairo Lima Tehran Los Angeles Berlin Moscow Nairobi AQG = WHO Air Quality Guideline PM 2.5 (ug/m 3 ) MPI (unitless)

Satellite-Model Estimate of Aerosol Composition Indicates Sulfate-Nitrate-Ammonium Aerosol Dominates Global Health Burden Philip et al., EHP, in prep. SO 4 2- NO 3 - NH 4 + Organic Matter Mineral Dust

PM 2.5 Nearly as Sensitive to NO x as to SO 2 and NH 3 Kharol et al., GRL, in prep GEOS-Chem Calculation of Annual PM 2.5 Response to 10% Change in Emissions ΔNO x EmissionsΔSO 2 Emissions ΔNH 3 Emissions

Increasing NO x Emissions Increases NO 3 -, NH 4 +, and SO 4 2- Increasing SO 2 Emissions Decreases NO 3 - Kharol et al., GRL, in prep

Challenges in Development of AMF Calculation for GEMS Largest Source of Uncertainty in LEO Trace Gas Retrievals Representing diurnal variation in surface reflectance during the period before measured from GEMS (use GOCI?) Diurnal variation in trace gas profile (changes rapidly in morning) Accounting for aerosols (still unresolved for LEO). Existing cloud products partially account for aerosol Concentration Altitude

PM 2.5 Sampling Station from Vanderlei Martins (UMBC) AOD from CIMEL Sunphotometer (AERONET) SPARTAN: An Emerging Global Network to Evaluate and Improve Satellite-Based Estimates of PM 2.5 Measures PM 2.5 Mass & Composition at AERONET sites Opportunity to Coordinate with GEMS Validation?

Contribute to Global Constellation by Linking GEMS with Other Geostationary Missions Through PCW/PHEOS Observing All Three Regions over 30N-60N PCW / PHEOS PHEOS PI: Jack McConnell Asia (e.g. GEMS) Europe (e.g. Sentinel-4) North America e.g.

NO 2 Indicator of Combustion Sources Sulfate-Nitrate-Ammonium Aerosol Sensitive to NO x Emissions Acknowledgements: NSERC, Environment Canada, Health Canada, NASA GEMS NO 2 Observations Will Be a Key Indicator of Aerosol Pollution Challenges Intercalibration of geostationary instruments & retrievals Slant to Column (i.e. diurnal components of AMF)