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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)

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Assessment of CO outflow during TRACE-P period

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  1. 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

  2. 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

  3. 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

  4. 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.

  5. 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

  6. Ozone Violations, July 12-17, 1997

  7. GPS 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) UMd Research Aircraft *Aircraft operated by: University Research Foundation

  8. 1997 Flights Gettysburg Greene County Fallston Holbrook Gaithersburg Bay Bridge AM Flight PM Flight

  9. 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

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