assessment of co outflow during trace-p period
DESCRIPTION
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) - PowerPoint PPT PresentationTRANSCRIPT
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
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S. Maryland Charles
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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
Ozone Profile7/13/97 6:29 EST Gettysburg, PA
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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