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Concept

Assessing the WRF model with the CAM5 physics suite (WRF-CAM5): model implementation, evaluation, and resolution sensitivity. Po-Lun Ma , Philip J. Rasch , Jerome D. Fast , Richard C. Easter , William I. Gustafson, Jr., Xiaohong Liu , Steven J. Ghan , Balwinder Singh

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Concept

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  1. Assessing the WRF model with the CAM5 physics suite (WRF-CAM5): model implementation, evaluation, and resolution sensitivity Po-Lun Ma, Philip J. Rasch, Jerome D. Fast, Richard C. Easter, William I. Gustafson, Jr., Xiaohong Liu, Steven J. Ghan, Balwinder Singh Pacific Northwest National Laboratory

  2. Concept

  3. Macrophysics dt • Cloud fraction • Large-scale condensation and evaporation • Aerosol activation and re-suspension • Detrainment of liquid and ice condensate (mass+number) from convections (treated in physics_addtendc)

  4. Code implementation

  5. ARCTAS/ARCPAC/ISDAC (April, 2008) Convair, B-200, DC-8, P3-B

  6. Meteorology

  7. Clouds

  8. Vertical profile of BC

  9. Vertical BC Distributions Simulated BC Concentration Along DC-8 Flight Path mg m-3 Dx = 160 km Dx = 80 km Dx = 40 km Dx = 20 km Dx = 10 km observedDx = 160 km, 80 km, 40 km, 20 km, 10 km Complex layers produced by Dx = 10km simulation Simulated peak concentrations factor of ~2 too low

  10. PSAP surface measurement of BC

  11. Resolution dependence of BC transport WRF 80 km CAM5 WRF 160 km WRF 40 km WRF 20 km WRF 10 km Cloud Fraction domain average = 0.2 for all CAM5 WRF 80 km WRF 160 km WRF 20 km WRF 40 km WRF 10 km Black Carbon Barrow (ng/kg) CAM5 0.3 160 km 3.4 80 km 34.0 40 km 46.9 20 km 54.3 10 km 51.6

  12. Cloud susceptibility to aerosol forcing Implication: aerosol indirect forcing decreases with increasing resolution

  13. AOT over Barrow and Bonanza Creek (AERONET sites)

  14. LWC at Barrow (ARM-NSA) Observed mean Observed min Observed max CAM5 0.37e-3 0.15e-3 4.23e-3 1.23e-3 CAM5 10 km CAM5 80 km CAM5 20 km CAM5 40 km 3.28e-3 3.02e-3 1.98e-3 2.11e-3 MESO 10 km MESO 80 km MESO 20 km MESO 40 km 1.27e-3 1.35e-3 1.25e-3 0.87e-3

  15. IWC at Barrow (ARM-NSA) Observed mean Observed min Observed max CAM5 0.026 0.041 0.018 0.007 CAM5 10 km CAM5 80 km CAM5 20 km CAM5 40 km 0.010 0.014 0.011 0.011 MESO 10 km MESO 80 km MESO 20 km MESO 40 km 0.003 0.003 0.003 0.003

  16. CAM5 physics suite (aerosol, cloud, deep and shallow convections, turbulence) has been implemented in WRF (and WRF-Chem) • CAM5 physics show some resolution dependency on long-range aerosolstransport and aerosol-cloud interactions, but large bias still remains • WRF with a typical set of WRF physics does not reduce the model bias when the model is driven by the same initial and boundary conditions • Allowing fractional clouds produces more clouds—results better-agreed with observations • WRF-CAM5 (Ma et al) has been applied to study pollutions in Mexico (Fast et al), marine stratocumulus clouds off the coast of South America (Burrows et al), clouds and precipitation in the continental US (Gustafson et al), aerosol effects on convections (Lim et al), long-range transport of aerosols (Fast et al), etc., and we welcome collaborations!! Summary

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