2011 operational hwrf model upgrades
DESCRIPTION
2011 operational HWRF model upgrades. EMC/NCEP/NWS/NOAA. Young C. Kwon, V. Tallapragada, R. Tuleya, Q. Liu, K. Yeh*, S. Gopal*, Z. Zhang, S. Trahan and J. O’connor. *: HRD/AOML. Main components of 2011 upgrades. Use WRF-NMM3.2 dynamic core Upgrade the vortex initialization scheme - PowerPoint PPT PresentationTRANSCRIPT
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2011 operational HWRF model upgrades
EMC/NCEP/NWS/NOAA
Young C. Kwon, V. Tallapragada, R. Tuleya, Q. Liu, K. Yeh*, S. Gopal*, Z. Zhang, S. Trahan and J. O’connor
*: HRD/AOML
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1. Use WRF-NMM3.2 dynamic core 2. Upgrade the vortex initialization scheme3. Upgrades of Simplified Arakawa-Schubert
(SAS) deep convection scheme to 2010 GFS4. Modified air-sea enthalpy exchange
coefficient (Ch) at high wind speeds5. Several bug-fixes in radiation and Micro-
physics scheme
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Main components of 2011 upgrades
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Experiments
► HR20: Baseline HWRFV3.2► HR21: HR20 + New GFS deep convection► HRDI: New Vortex initialization ► HR28: New Init + New SFC + New deep convection ► H211: GFS convection + New SFC + New init + bug fixes + new 2011 GFS :: To be run soon
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Modified initialization1. Vortex size correction - Instead of matching only RMW but also matching outer radii
such as ROCI or R34kt2. Less use of the composite storms for weak storms - Preventing the rapid spin-up of weak storms3. Matching the maximum 10m wind speed but not
forcing the minimum SLP - With more balanced vortex, rapid spin-down of strong
storm is much reduced
* Modified initialization significantly improve the intensity skill of HWRF model (especially 0-48hr)
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New INIT
BaselineModified initialization improves the intensity skill over 20% at the early time (0-48hr)
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Initial spin-up for weak storms
New initialization
Much reduced spin-up
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Initial spin-down for strong storms
New initialization
Much reduced spin-down
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IGOR 2010091300
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HR20: PARENT HRDI: PARENT GFDL: PARENT
HR20: NEST HRDI: NEST GFDL: NEST
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Major changes in deep convection scheme
1. Random cloud top is replaced by a single deep cloud. In sub-cloud layer, entrainment rate is given to be inversely proportional to height and the detrainment rate is set to be a constant as entrainment rate at the cloud base. Above cloud base, an organized entrainment is added, which is a function of environmental relative humidity.
2. Convective overshoot is parameterized in terms of the cloud work function (CWF) (negative energy above neutral buoyancy level is set to be 10% of the CWF).
3. Maximum cloud base mass flux [currently 0.1 kg/(m2s)] is defined for the local Courant-Friedrichs-Lewy (CFL) criterion to be satisfied, but less than 0.5 kg/(m2s).
4. The effect of convection-induced pressure gradient force on cumulus momentum transport is included, which reduce the convective momentum mixing.
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New convection
baseline
Track improved significantly with new GFS convection
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However, intensity is too weak with new convection
New convection
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New init +
New init with GFS convection show large negative bias : increase of Ch
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New Ch for 2011
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HR28
baseline
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New ChOriginal Ch
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BASELINE
HR28
~ 35% improvement
Earl Richard
Tomas Celia
Track degraded
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Earl:082600Earl:082800
Red:baseline
Blue:2011 HWRF
Celia:062000Celia:062112
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HR28
H211
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Red:H211
Purple:2010 opr