CMAQ Sensitivity Testing for the Eastern United States Jeffrey W. Stehr Department of Meteorology University of Maryland October 22, 2002 Durham, NC, Models-3.

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Presentation transcript:

CMAQ Sensitivity Testing for the Eastern United States Jeffrey W. Stehr Department of Meteorology University of Maryland October 22, 2002 Durham, NC, Models-3 Users’ Workshop

Meteorology THE SIMULATION: Meteorology: MM5 using Gayno-Seaman planetary boundary layer scheme 24 vertical levels, 12 km (202 x 199) nest inside a 36 km domain Analysis nudging to NCEP (Eta) reanalysis There are problems with MM5!!!

Meteorology: Modifying MM5 University of Maryland (Zhang & Zheng) has modified the Blackadar boundary layer scheme to achieve better surface winds and temperatures Other PBL schemes do a very poor job of it These are thunderstorm, hurricane, and frontal models—who cares about a still, stagnant day?

Meteorology: Winds Observations Modified Blackadar Winds from other PBL schemes have essentially nothing to do with reality Comparisons by NYDEC

Meteorology: Temperature (modified Blackadar) Temperature (K) Wind Speed (m/s) Data comparisons By NYDEC

Photochemistry Emissions: MEPPS with 1995 National Emissions Trends Inventory NOT extrapolated to 1997 CMAQ: 23 vertical levels, 110 x 80 (East-West x North-South) 12 km horizontal resolution 72 hours of spinup before July 13 CB4 chemical mechanism, MEBI solver

Measurements THE AIRCRAFT: Instrumented Cessna-172* Chemistry: Ozone, Carbon Monoxide Meteorology: Relative humidity, Temperature, Pressure altitude *Currently, we fly a twin-engine Aztec with CO, O 3, SO 2, PSAP, T, RH, P alt, nephelometer, Met One counter, streaker—B. Doddridge, L. Marufu, B. Taubman

The domain

Measurement sites W29 W42 GAI HOL WAY W05

Measurements Examine: July 13-14, 1997 Four measurement flights Ozone data only (CO malfunctioned) First show everything, then go back Used the old MM5 data!

Gaithersburg, MD KEY: CMAQ Aircraft

Gettysburg, PA

Holbrook, Southwestern PA

Waynesburg, Southwestern PA

Gettysburg, PA

Fallston, MD (NE of Baltimore)

Bay Bridge Airport Eastern Shore, July 14

Waynesburg, Southwestern PA

Gettysburg, PA

Fallston, MD (NE of Baltimore)

Measurements July 13, Gettysburg PA—structure in both AM and PM flights, but not quite enough ozone. July 13, Fallston MD—may be just outside the Baltimore plume. July 14, Bay Bridge Airport—obviously, 12 km resolution just isn’t enough to get the Bay Breeze effects right. Our Met modelers suggest that maybe 2 km resolution will do it, probably 1 km resolution. AM PM

Future Compare CMAQ simulation results for this run and for a run with the new-and- improved MM5 PBL scheme. This should help identify the role played by the boundary layer scheme in these simulations.

Acknowledgements Da-Lin Zhang & Weizhong Zheng, UMD MM5 modeling Bruce Doddridge, Lackson Marufu, Brett Taubman, UMD aircraft measurements Gopal Sistla, NYDEC, comparisons between MM5 and measurements Fiscal Support: Maryland Department of the Environment