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1. Comparing HWRF precipitation with satellite products (CMORPH)

1. Comparing HWRF precipitation with satellite products (CMORPH) 2. Diagnosis of Hurricane PBL height with different methods 3. Efforts towards parameterizing HPBL Roll fluxes. Comparing HWRF precipitation with satellite products (CMORPH). HWRF. OBS.

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1. Comparing HWRF precipitation with satellite products (CMORPH)

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  1. 1. Comparing HWRF precipitation with satellite products (CMORPH) 2. Diagnosis of Hurricane PBL height with different methods 3. Efforts towards parameterizing HPBL Roll fluxes

  2. Comparing HWRF precipitation with satellite products (CMORPH)

  3. HWRF OBS Contours are distance from the track, interval=1deg. Mean Precip varies with distance from track

  4. Distribution of rain amount over different areas 0 to 1 deg from track 0 to 6 deg 1 to 2 deg 2 to 3 deg

  5. Diagnosis of Hurricane PBL height

  6. (2012)HWRF PBL EARL, INIT-2011 09 02 00, 24-hour forecast Observed Hurricane PBL Inflow depth Max wind height PBL height PBL Mixed layer Inflow/max wind PBL is below or ~ inflow depth PBL >> inflow/max wind H ?? Zhang MWR 2011

  7. Different PBLH & K Z • Use alpha to tune K Critical Rbc = 0.25 Rb = f(h,surface) K =0.5 x ku*z(1-z/h)2 • New try Critical Rbc= 0.3 Rb=f(h, mixed layer, first layer) K = ku*z(1-z/h)2. PBL top Cal Ri # 0 Z PBL top ML top Cal Ri # 1st level 0

  8. NEW PBL-H&K HWRF-2012 Ideal PBLH Max Wind H Real EARL F24 PBL Inflow H Inflow H PBL

  9. Efforts towards parameterizing HPBL Roll fluxes

  10. Observation JAS, 2005?

  11. Diagram of HPBL rolls Morrison 2005, JAS

  12. A simple parameterization of roll fluxes Wu σu cu Wd σd cd

  13. Example of vertical profiles of sub-grid fluxes Roll flux We have assumed roll up- and down-draft distribution and speed, which need obs to verify and improve.

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