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Master list of all wr50a simulations

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					     WRF SLP Bias Issues
Update from Santa Cruz meeting

           Matt Higgins
           John Cassano
           May 18, 2010




                                 1
SLP Bias Issue

As mentioned at the
Santa Cruz meeting,
WRF atmospheric
simulations have shown
significant high SLP bias
in the N. Pacific

Shown is the “best
case” of the many non-
nudging options
examined




shown: LW 4 SW 4 /
no nudging, WRF 3.1.0


                  2
SLP Bias Issue

Things could be worse




shown: Polar MM5 on
wr50a domain


                 3
All WRF physics and dynamics options examined
~45 different simulations
Physics options:                                    Other simulations:
•       control                                     •       WRF 3.1.0 w/ WRF 3.1.1 landuse.tbl
•       mp 10                                       •       WRF 3.1.1
•       pbl, sfl 1                                  •       WRF 3.2.0
•       no fractional ice                           •       era-interim forcing
•       lw 4, sw 4                                  •       Polar MM5
•       lw 4, sw 4 and cu_physics 1                 •       lw 4, sw 4 and smooth_cg_topo
•       lw 4, sw 4 and cudt 0                       •       10 pt relaxation zone
                                                    •       exponential ramping (spec_exp = 0.33)
Dynamics options:                                   •       sea ice albedo fix
•     lw 4, sw 4, damp_opt 1, dampcoef 0.01         •       on pingo
•     lw 4, sw 4, damp_opt 1, dampcoef 0.10         •       sea ice thermal conductivity fix
•     lw 4, sw 4, damp_opt 3, dampcoef 0.20         •       sea ice thermal conductivity fix (alternate fix)
•     lw 4, sw 4, gwd_opt 1, coarse topo
•     lw 4, sw 4, gwd_opt 1, normal topo
                                                    Nudging options
Domain size changes:                                •     gridded fdda (top 20 layers)
•     XL (top inc. by 2,000 km)                     •     gridded fdda for 3 days, then off (top 20 layers)
•     wr50b (top dec. by 2,000 km)                  •     spectral fdda, only geopotential (top 20)
•     wr50c (left dec. by 2,000 km)                 •     spectral fdda, only u, v, and T (top 20)
•     wr50d (smallest domain that fits POP)         •     spectral, uvt, max wv 1 (top 20)
•     wr50e (bottom dec. by 2,000 km)               •     spectral, uvt, max wv 2 (top 20)
•     wr50f (bottom inc. by 2,000 km)               •     spectral, uvt, max wv 3 (top 20)
•     wr50g (bottom dec. by 800 km)                 •     spectral, uvt, max wv 2 (ramped 20->30, full 30-40)
                                                    •     spectral, uvt, max wv 3 (ramped 20->30, full 30-40)
BPRC related simulations:                           •     WRF 3.2, spectral, uvt, max wv 2 (ramped 20->30,
•      BPRC recommend physics                             full 30-40)
•      Polar WRF, all defaults
•      Polar WRF, only alt temp surf
•      Polar WRF, all defaults, BRPC rec. physics



                                                                                                                4
“The chosen one”

lw 4 sw 4 with spectral
fdda for U, V, and T, max
wave number 2
layers 1-20: no nudging
layers 21-30: linearly
ramped
layers 31-40: full
nudging




shown: sfdda wv2
rmp


                   5
Additional Spectral
Nudging Options

lw 4 sw 4 with spectral
fdda for U, V, and T, max
wave number 1
layers 1-20: no nudging
layers 21-40: full
nudging




shown: sfdda wv1



                   6
Additional Spectral
Nudging Options

lw 4 sw 4 with spectral
fdda for U, V, and T, max
wave number 2
layers 1-20: no nudging
layers 21-40: full
nudging




shown: sfdda wv2



                   7
Additional Spectral
Nudging Options

lw 4 sw 4 with spectral
fdda for U, V, and T, max
wave number 3
layers 1-20: no nudging
layers 21-40: full
nudging




shown: sfdda wv3



                   8
Additional Spectral
Nudging Options

lw 4 sw 4 with spectral
fdda for U, V, and T, max
wave number 3
layers 1-20: no nudging
layers 21-30: linearly
ramped
layers 31-40: full
nudging




shown: sfdda wv3
rmp


                   9
WRF 3.2

WRF 3.2.0, no nudging
(same namelist as
previous best WRF 3.1.0
option, slide #2)




shown: lw 4 sw 4
3.2.0


                10
WRF 3.2.0,
lw 4 sw 4 with spectral
fdda, max wave 2
layers 1-20: no nudging
layers 21-30: linearly
blend
layers 31-40: full
nudging




shown: lw 4 sw 4
3.2.0 wv2 rmp


                11
CORDEX Simulations


•   1989-2007 on wr50a domain
•   Same physics namelist as RACM (40 levels, Goddard microphysics,
    RRTMG longwave and shortwave, MYJ boundary layer / surface layer,
    Noah LSM
•   ERA-Interim initialization on Jan 1, 1989 with ERA-Interim lateral
    boundary conditions and skin temperature
•   SMMR and DMSP SSM/I Bootstrap sea ice concentrations from NSIDC
•   Currently running two sets of simulations: WRF 3.2 with and without
    spectral nudging
•   Spectral nudging simulations use nudging for U, V, and T, have a max
    wave number of 2, are ramped from layers 21-30 and full for 31-40




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