NO X Chemistry in CMAQ evaluated with remote sensing Russ Dickerson et al. (2:30-2:45PM) University of Maryland AQAST-3 June 13, 2012 Madison, WI The MDE/UMD.

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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

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End summer only controls

Thanks T. Canty

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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Proposal submitted to NASA EV-I

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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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GRIPS Quad-

Telescope Detailed Design

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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

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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