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Parameterizing NOx Emissions in Regional Scale WRF-Chem

Parameterizing NOx Emissions in Regional Scale WRF-Chem. Amanda Hansen Henry Fuelberg Ken Pickering Steve Peckham GOES-R GLM Workshop September 2009. Objectives. Develop parameterization that gives a vertical distribution of lightning-produced NOx

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Parameterizing NOx Emissions in Regional Scale WRF-Chem

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  1. Parameterizing NOx Emissionsin Regional Scale WRF-Chem Amanda Hansen Henry Fuelberg Ken Pickering Steve Peckham GOES-R GLM Workshop September 2009

  2. Objectives Develop parameterization that gives a vertical distribution of lightning-produced NOx Suitable for WRF-Chem at scales of 10-20 km Hydrometeor fluxes not available at this scale Determine flash rate from WRF-Chem Assume an average NOx production per flash Then, distribute the NOx vertically

  3. Flash Rate Parameterization (Futyan and Del Genio, 2007) Fifth order power law for radar top height (above surface) Second order for radar top height above 0oC isotherm. **our choice**

  4. Flash Rate Parameterization • Flash rate (F) calculated in WRF-Chem using relation by Futyan and DelGenio: • F = AHn • where, • A = 0.29, and n = 1.80 • Radar reflectivity calculated in WRF-Chem using 3-D hydrometeors from WSM6 • microphysical scheme coupled with Kain-Fritsch cumulus parameterization. • Convective storm height above freezing level (H) is 18 dBz above freezing level • Freezing level is obtained from the WRF temperature field. • ● Production rate of NO from both IC and CG lightning: 500 moles per flash • (Ott et al., in progress)

  5. KSC Summers vs. KSC 19 Months KSC JJA 2004-05 FSU KSC 19 mo. 1997-98 After Boccippio et al. (2000) 0.25 km Vert Res.

  6. Compare KSC to Northern Alabama N.AL. Apr-Sept. 2003-05 Courtesy Dennis Buechler KSC JJA 2004-05 0.25 km Vert Res.

  7. Percentage Profiles for Various StormTops Above the Freezing Level

  8. Storm A Profile Percentages Source Density

  9. Storm B Profile Percentages Source Density

  10. WRF-Chem Model and Domain for Testing FSULNOx Mother domain: 36 km Nested domain: 12 km • Within WRF-Chem namelist two user defined options will be added • Lighting_opt 0,1; turn lightning off/ on • Lightning_time_step Lightning Module placed in chem directory and contains subroutine radar subroutine lightning Module will be called from Chem_driver.F right after emissions.

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