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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). - PowerPoint PPT Presentation
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Satellite Remote Sensing of Ground-Level NO2 for New Brunswick
Randall Martin and Lok Lamsal
Dalhousie University
Major Nadir-viewing Space-based Measurements Major Nadir-viewing Space-based Measurements of AQHI Speciesof AQHI Species
Sensor MISR MODIS SCIA-MACHY
TES OMI PARA-SOL
GOME-2
IASI S-5 Precursor
Platform (launch)
Terra Aqua
(1999) (2002)
Envisat (2002)
Aura
(2004)
PARA-SOL
(2004)
MetOp
(2006, 2011, 2016)
2014?
Equator Crossing
10:30 1:30 10:00 1:45 1:30 9:30 1:30
Typical Res (km)
18x18 10x10 60x30 8x5 >24x13 18x16 80x40 12x12 7x7
Global Obs
(w/o clouds)
7 2 6 n/a 1 1 1 0.5 1
Aerosol X X X
NO2 X X X X
Ozone X X X X X X
Solar Backscatter & Thermal Infrared
Proposed: MCAP (CSA), GEO-CAPE (NASA)
Use Satellite Observations to Improve Emissions Use Satellite Observations to Improve Emissions Inventories, and In Turn Simulations Inventories, and In Turn Simulations
Tropospheric NOTropospheric NO22 Column Proxy for Surface Concentration 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
General Approach to Estimate Surface ConcentrationGeneral Approach to Estimate Surface Concentration
Daily Observed Column
S → Surface Concentration
Ω → Tropospheric column
In Situ
GEOS-Chem
Coincident Model Profile
OM
MO S
S
Significant Correlation Between In Situ and OMI-derived Significant Correlation Between In Situ and OMI-derived Surface NOSurface NO22; ; Less Clear for New BrunswickLess Clear for New Brunswick
Correlation with Coincident “Corrected” Observations over 2005
DOMINO
Lamsal et al., JGR, 2008
Annual mean in early afternoon ~13:45 for 2005
New Brunswick Generally Has Low NONew Brunswick Generally Has Low NO22 Concentrations Concentrations
OMI-derived Surface NO2 Concentration (ppbv)
... However There are Transient Events... However There are Transient EventsEarly Afternoon (13:00 – 14:00) NO2 Concentration
Mean OMI-derived NO2 for New Brunswick
More Analysis Needed for Direct ComparisonMore Analysis Needed for Direct ComparisonCollocated measurements (OMI Black x 5)
Different spatial scalesNo NOz interference correction
Local sources?
Interference in Molybdenum Converter Interference in Molybdenum Converter Measurements in Southeast US (YRK)Measurements in Southeast US (YRK)
Lamsal et al., JGR, in press
Photolytic / Molybdenum
Modeled (GEOS-Chem)
~NO2 / 0.1*ΔO3 [14:00 – 10:00] (Boersma et al., ACP, 2009)
OMI Observes During Minimum NOOMI Observes During Minimum NO22
Observations from EPA air quality networkObservations from EPA air quality network
Lamsal et al., JGR, 2008
mean
median
Possible StrategyPossible Strategy
Use satellite to monitor for extreme events
(i.e. when partial AQHI from NO2 exceeds a threshold)
IssuesIssues• 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