Assessment of CO outflow during TRACE-P period

Assessment of CO outflow during TRACE-P period

• Calculate CO distribution during TRACE-P period using University of Maryland CTM• driven by fields from GEOS DAS (5 simulations)

• Base: 2.0° x 2.5° grid / Monthly bb and Annual ff/bf (Kiley et al. based on Streets/Yevich/Logan)

• Bbb: 2.0° x 2.5° grid / Daily bb and Monthly ff/bf (Woo/Streets/Kiley) • SGbb: “0.5 ° x 0.5°” / Daily bb and monthly ff/bf• Boh: 2.0° x 2.5° grid / Monthly bb and Annual ff/bf / modified Spivakovsky OH

(Russell Martin) • BnC: 2.0° x 2.5° grid / Monthly bb and Annual ff/bf/ no deep convection

• Compare with aircraft and MOPITT data. Optimize ff/bf and bb sources (minimizing RMS diffs between aircraft- and MOPITT-CO measurements. Evaluate resulting distributions.

• Study in progress

A-priori and a-posteriori correlation coefficients based on comparison of model output with 5-minute merge CO data

from DC-8 Flights 7-17

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Mid-Atlantic Air quality modeling efforts at the University of Maryland

Principals:

Director: Russ Dickerson

CMAQ modeling: Jeff Stehr and Dale Allen

MM5: Da-Lin Zhang and Weizhong Zheng

SMOKE: Sheryl Ehrman and Yu-Jin Choi

GEOS-CHEM interface: Dale Allen and collaborators (planned)

Aircraft measurements: Bruce Doddridge, Lackson Marufu, and Brett Taubman

Funding: Maryland DOE, Maryland DNR, NARSTO-NE, MANE-VU, NE-OPS

Purpose

• Scientifically-motivated and policy-driven simulations of Mid-Atlantic air quality

• Past: Simulations of 1997 air quality with CMAQ driven by MM5. Default IC/BC

• Future: Simulations of 2002 (MDE’s choice) air quality with CMAQ driven by MM5. IC/BC from O3 chemistry/PM version of GEOS-CHEM

• Met fields for past and future simulations driven by MM5. “UMD”-MM5 includes PBL scheme (Zhang & Zheng) with an improved treatment of vertical mixing within very stable boundary layers.

CMAQ Options and Modules

• SMOKE Emissions, 1996 NET Inventory

• CB-4 Chemistry with MEBI Solver; AERO3 Aerosol Module

• No Plume-in-Grid

• July 5- July 21, 1997

• Horizontal grid: 12 km grid nested within 36 km grid

• Vertical grid: 24 MM5 layers collapsed to 16 CMAQ layers: Lowest 11 layers (3 km) unchanged

• Cloud: radm2

• June 2002 Release

• Sun Ultra-2

Ozone Violations, July 12-17, 1997

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Greenbelt Prince George's

Millington Kent

Padonia Baltimore

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DailyMaxima

Monitors

UMd Research AircraftUMd Research AircraftGPS Position (°Lat, °Long)

Meteorology (T, RH, Pr, Palt)

Carbon Monoxide (CO)

Ozone (O3)

Sulfur Dioxide (SO2)

Aerosol Optical Properties:

Absorption, Bap (565 nm)

Scattering, Bscat (450,550,700 nm)

Particle Counts (CPC: TSI 3007)

Aerosol Particle Size (MetOne)

6 cuts: range 0.3–1.0μm

Aerosol Chemistry (PIXE Streaker)*Aircraft operated by: University Research FoundationUniversity Research Foundation

Bay Bridge

Fallston

GaithersburgHolbrook

Greene County

Gettysburg

1997 Flights

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PM Flight

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Ozone Profile7/13/97 12:15 EST Greene County, PA

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Ozone Profile7/13/97 15:08 EST Fallston, MD

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Acknowledgements

• CMAQ modeling: Jeff Stehr and Russ Dickerson

• Aircraft measurements: Bruce Doddridge, Lackson Marufu, and Brett Taubman

• MM5: Da-Lin Zhang and Weizhong Zheng

• SMOKE: Yu-Jin Choi and Sheryl Ehrman

• TRACE-P modeling: Kenneth Pickering, J. H. Woo, and Randall Martin

• Support: NASA Grants NASA.NAG59672 and NASA.NAG511246; Maryland DOEnvironment, Maryland DNR, NARSTO-NE, MANE-VU, NE-OPS