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CONSTRAIN cold air outbreak DALES results

CONSTRAIN cold air outbreak DALES results. LWP (kg m -2 ) at t=10 hr, N c = 10 cm -3. Thomas Frederikse, Stephan de Roode , and Pier Siebesma. Set up of the simulations. L (km) D x (m) N c (cm -3 ) Purpose ________________________________________________ 102.4 200 10 Reference

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CONSTRAIN cold air outbreak DALES results

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  1. CONSTRAIN cold air outbreakDALES results LWP (kg m-2) at t=10 hr, Nc = 10 cm-3 Thomas Frederikse, Stephan de Roode, and Pier Siebesma

  2. Set up of the simulations L (km) Dx (m) Nc (cm-3) Purpose ________________________________________________ 102.4 200 10 Reference 102.4 400 10 Lower horizontal resolution 102.4 400 50 Larger droplet concentration 51.2 200 10 Smaller domain size 12.8 50 10 Fine-scale velocity structures • No ice microphysics

  3. Time series: cloud cover L (km) Dx (m) Nc (cm-3) 102.4 200 10 102.4 400 10 102.4 400 50 51.2 200 10 cloud cover time (hours) Droplet concentration affects cloud cover evolution

  4. Liquid water potential temperatureL = 102.4 km, Nc = 10 cm-3 Dx = 200 m (solid) Dx = 400 m (dashed) t=13hr t=10hr t=7hr t=3hr Coarser resolution hardly has an effect on the mean state evolution

  5. Total water contentL = 102.4 km, Nc = 10 cm-3 Dx = 200 m (solid) Dx = 400 m (dashed) t=13hr t=10hr t=7hr t=3hr Coarser resolution hardly has an effect on the mean state evolution

  6. Liquid water contentL = 102.4 km Nc = 10 cm-3 (solid) Nc = 50 cm-3 (dashed) t=13hr t=10hr t=3hr t=7hr Cloud droplet concentration has a large influence on the liquid water content

  7. Open-cell cloud structure t=7 hr, Nc = 10 cm-3 LWP (kg m-2) Dx = 200 m Dx = 400 m

  8. Cell sizes grow with time t=10 hr, Nc = 10 cm-3 LWP (kg m-2) Dx = 200 m Dx = 400 m

  9. Cell sizes grow with time t=13 hr, Nc = 10 cm-3 LWP (kg m-2) Dx = 200 m Dx = 400 m

  10. Wind velocity structure t = 3hr, Nc = 10 cm-3 at z=362.5 mResults from small domain size L=12.8 km, high horizontal resolution U (-6 to 2 m/s) V (-15 to -8 m/s) W (+2 to -2 m/s) 12.8 km 12.8 km Notice delicate vertical velocity (w) structure

  11. Effects of domain size (Dx=200m)t=13 hr, Nc = 10 cm-3 LWP (kg m-2) L=50 km seems just sufficiently large

  12. Effects of cloud droplet concentration LWP (kg m-2) Nc = 10 cm-3 Nc = 50 cm-3 Open cells develop both for Nc = 10 and 50 cm-3

  13. Energy spectra (reference simulation, z = 487.5 m) liquid water potential temperature vertical velocity 3 hours spectral energy spectral energy 7 hours 10 hours 13 hours 10-3 10-3 10-3 10-6 10-6 10-6 10-5 10-5 10-5 10-4 10-4 10-4 10-2 10-2 10-2 wavenumber k (m-1) wavenumber k (m-1) wavenumber k (m-1) total water content spectral energy gradual shift of spectral energy towards larger scales

  14. Energy spectra (reference simulation, z = 1487.5 m) liquid water potential temperature vertical velocity 3 hours spectral energy spectral energy 7 hours 10 hours 13 hours 10-3 10-3 10-3 10-6 10-6 10-6 10-5 10-5 10-5 10-4 10-4 10-4 10-2 10-2 10-2 wavenumber k (m-1) wavenumber k (m-1) wavenumber k (m-1) total water content spectral energy gradual shift of spectral energy towards larger scales

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