NO X Chemistry in CMAQ evaluated with remote sensing Russ Dickerson et al. (2:30-2:45PM) University...
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Transcript of NO X Chemistry in CMAQ evaluated with remote sensing Russ Dickerson et al. (2:30-2:45PM) University...
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NOX Chemistry in CMAQ evaluated with remote sensingRuss Dickerson et al. (2:30-2:45PM)
University of MarylandAQAST-3 June 13, 2012 Madison, WI
The MDE/UMD RAMMPP Team.
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Outline
• NO2 from OMI, DISCOVER-AQ and CMAQ– Concentrations & Trends– Urban/rural– Profiles
• GRIPS: Geostationary Remote Infrared Pollution Sounder
• Am Chem Soc MARM meeting session May 2012.
3Slide prepared by Clare Flynn, UMD PhD Candidate, AOSC
DISCOVER AQ Ground, model, air and satellite comparisons at a single location
CEMS Emission (point sources) Trends
NOx
NOx: Large decrease after SIP call in 2003; OH/PA/WV only scrub NOx during ozone season until January 2009; further decrease for all states after 2009. Hao He. 4
DOMINO v2 (OMI Satellite Obs.) CMAQ 4.7.1
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TroposphericColumn
0.25o x 0.25o
AQ SIP modelingJuly 2007
• Recent (n-1) version of CMAQ 4.7.1• Considers 2007 emissions/met. Fields• DOMINO v2 satellite retrieval
Model – lower than satellite in rural areas??? higher than satellite in urban regions Major Policy Implication; lightnig not enough(T. Canty)
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Altit
ude
(km
)
NO2 (ppbv)
Aircraft (UMD Cessna) data provide both regional information and vertical structure of pollutants
AM data / upwind / rural PM data / downwind / urbanThanks J. Stehr, L. Brent
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Papers Pending
• Profiles of NO2 from DISCOVER-AQ, Brent et al.
• Emissions fingerprints for Asia, North America…. Streets et al.,
• CMAQ vs. observed NO2 profiles, Canty et al.,• GASP observations and PM2.5, Stehr et al.
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GRIPS Quad – Telescope DesignThree Pressure Levels
P=0
P=P2P=P1
P=P3
Front View
Gas cells with pressuresP1, P2, P3 and 0.
Gas Cell Optics
Empty Cell
Optics
Optics
Detectors
Filter
Filter
SideView
Optics
M. Schoeberl
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Top View
Quad telescope bundles
O2: 0.76 µm
CO: 2.33 µm
CO: 4.64 µm CO2: 2.05 µm
CH4: 2.28 µm
N2O: 3.88 µm
Gimbal
2.3 ft
2.5 ft
1.5 ft
Gimbal
GRIPS External Multi-Telescope
Design
Carbon Monoxide from GEO
Methane from GEO
GRIPS Fingerprints, Asia
ResidentialVehiclePower
GRIPS
CO2
/ C
O
Industry
GRIPS + GEMS
Biomass
104
103
102
10
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Emission Ratios
Ratios of trace gases provide unique fingerprints that can help us identify emission sources. GRIPS can distinguish pollution sources using CO2 / CO and CO2 / CH4 ratios. Augmenting GRIPS with data from a UV/Vis spectrometer such as GEMS will allow further categorization. For example, with SO2 and NO2 measurements we can further distinguish sources.
GRIPSGeostationary Remote Infrared Pollution Sounder
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Thank YouConclusions
1. NO2 Concentrations from OMI are in reasonable agreement with aircraft columns and Pandora.
2. Both remote and in situ observations reflect impressive downward trends.
3. The urban/rural ratio is smaller in observations than in CMAQ.
4. Emissions can be evaluated with proposed remote sensing instruments.
Instrument OverviewGRIPS employs the well-tested gas filter correlation radiometry (GFCR) technique, used successfully by HALOE, MOPITT, and other satellite instruments. Solar reflected and thermal IR radiation is filtered through gas-cells at different pressures. The gas filters provide superior spectral resolution, and can separate the signature of the measurement gas at different altitudes (see figure below). GRIPS will provide boundary layer, mid-tropospheric, and total column concentrations of CO, CO2 and CH4 over the entire Asian continent with 8 km nadir resolution.
Species (l µm)
CO2 2.05
CH4 1.66
CO2.33
4.64
N2O 3.88
O2 0.76
To measure each species, light is collected by a 4-telescope bundle hosting gas cells at different pressures. The 4 beams are focused on a cooled HgCdTe detector array. One bundle each is used for CH4, CO2, N2O and O2. CO requires two bundles. The O2 and N2O measurements are for mitigating effects of aerosols, clouds and surface pressure variations. The bundles can be configured to fit the available space, and one possible configuration is shown here on the pointing gimbal
45
cm
GRIPSGeostationary Remote Infrared Pollution Sounder
GRIPS Instrument Mass: 38 kgPower: 23 WData Rate: 5 Mb/sVolume: 0.13 m3 15