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Satellite Remote Sensing of Ground-Level NO 2 for New Brunswick

Satellite Remote Sensing of Ground-Level NO 2 for New Brunswick. Randall Martin and Lok Lamsal Dalhousie University. Major Nadir-viewing Space-based Measurements of AQHI Species. Solar Backscatter & Thermal Infrared. Proposed: MCAP (CSA), GEO-CAPE (NASA).

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Satellite Remote Sensing of Ground-Level NO 2 for New Brunswick

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  1. Satellite Remote Sensing of Ground-Level NO2 for New Brunswick Randall Martin and Lok Lamsal Dalhousie University

  2. Major Nadir-viewing Space-based Measurements of AQHI Species Solar Backscatter&Thermal Infrared Proposed: MCAP (CSA), GEO-CAPE (NASA)

  3. Use Satellite Observations to Improve Emissions Inventories, and In Turn Simulations

  4. Tropospheric NO2 Column Proxy for Surface Concentration NO/NO2  with altitude OMI Tropospheric NO2 Column (1015 molecules cm-2) for 2005 Daily Retrieval Uncertainty: 1x1015 molec cm-2 + 30% of trop column Data from Lamsal et al., JGR, in press

  5. In Situ GEOS-Chem General Approach to Estimate Surface Concentration Coincident Model Profile Daily Observed Column • S→ Surface Concentration • Ω → Tropospheric column

  6. Significant Correlation Between In Situ and OMI-derived Surface NO2; Less Clear for New Brunswick DOMINO Correlation with Coincident “Corrected” Observations over 2005 Lamsal et al., JGR, 2008

  7. New Brunswick Generally Has Low NO2 Concentrations Annual mean in early afternoon ~13:45 for 2005 OMI-derived Surface NO2 Concentration (ppbv)

  8. ... However There are Transient Events Early Afternoon (13:00 – 14:00) NO2 Concentration Mean OMI-derived NO2 for New Brunswick

  9. More Analysis Needed for Direct Comparison Collocated measurements (OMI Black x 5) Different spatial scales No NOz interference correction Local sources?

  10. Interference in Molybdenum Converter Measurements in Southeast US (YRK) Photolytic / Molybdenum Modeled (GEOS-Chem) ~NO2 / 0.1*ΔO3 [14:00 – 10:00] (Boersma et al., ACP, 2009) Lamsal et al., JGR, in press

  11. OMI Observes During Minimum NO2Observations from EPA air quality network mean median Lamsal et al., JGR, 2008

  12. Possible Strategy Use satellite to monitor for extreme events (i.e. when partial AQHI from NO2 exceeds a threshold) Issues • Examine wintertime spikes; caution over snow • Interference in ground-based NO2 measurements • Assess diurnal variation with in situ • Cloud-free: test clear sky bias • “Row Anomaly” restricts OMI Coverage; may need to consider GOME-2

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