physics experiments with the ufs short -range …...2015 2015 2015 2015 2015 model-analysis 25km t2...
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Physics Experiments with the UFS Short-Range Weather Application for Prediction of an Extreme Heat Wave
Linlin Pan1,2,3, Evelyn Grell2,3,6, Evan Kalina1,2,3, Kathryn Newman3,4, LigiaBernardet1,3, Dom Heinzeller1,2,3, Jeff Beck1,3,5, Gerard Ketefian1,2,3, Michelle
Harrold3,4, Tracy Hertneky3,4, Nick Lybarger3,4, and Georg Grell11NOAA/GSL, 2University of Colorado/CIRES, 3Developmental Testbed Center,
4NCAR, 5Colorado State University/CIRA, 6NOAA/PSL
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Motivation and Methods Study the impacts of different physics schemes on the heat wave simulation. Use the UFS Short-Range Weather (SRW) application Model Horizontal grid spacings: 25km, 13km, and 3km July 16, 2019 heat wave case
Verifications with GFS analysis, surface station observations and radiosondes using MET
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Physics schemes used in the experimentsGFDL_MP GFS_V15.2 GFS_v16beta GSDv0 GSDv1 GSD_noah
Deep convection SA-SAS SA-SAS SA-SAS SA/AA-GF None SA/AA-GF
Shallowconvection
SA-MF SA-MF SA-MFMYNN-EDMF andSA-GF
None MYNN-EDMF andSA-GF
Microphysics GFDL GFDL GFDL AA-Thompson AA-Thompson AA-Thompson
Saturation adj. True True True False False False
PBL/Turbulence K-EDMF K-EDMF Moist SA-TKE-EDMF MYNN-EDMF MYNN-EDMF MYNN-EDMF
LSM Noah Noah Noah RUC RUC Noah
d4_bg 0.15 0.12 0.12 0.12 0.12 0.12vtdm4 0.075 0.02 0.02 0.02 0.02 0.02sponge 30 30 10 10 10 10tau 5 5 10 10 10 10hord_mt 6 6 5 5 5 5hord_vt 6 6 5 5 5 5hord_tm 6 6 5 5 5 5hord_dp -6 -6 -5 -5 -5 -5Ozone 2006 2015 2015 2015 2015 2015
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Model-Analysis 25km
T2 12h FCST and BIAS
V16beta 25km V16beta 13km
V15.2 25km V15.2 13km
More detailed structures with higher resolution
Model-Analysis 25km
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T2 bias at 25km
GFDL-MP 00h GFDL-MP 12h
GFSv15.2 12hGFSv15.2 00h
GFSv16beta 00h GFSv16beta 12h
Model-Observationat 00h and 12h FCST
Warm bias in West,cold bias in East
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T2 bias at 25km
GFDL-MP 24h GFDL-MP 36h
GFSv15.2 36hGFSv15.2 24h
GFSv16beta 24h GFSv16beta 36h
Model-Observationat 24h and 36h FCST
Warm bias in West,cold bias in East
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T2 bias at 25km
GSDv0 00h GSDv0 12h
GSDv1 12hGSDv1 00h
GSD_noah 00h GSD_noah 12h
Model-Observationat 00h and 12h FCST
Warm bias in West,cold bias in East
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T2 bias at 25km
GSDv0 24h GSDv0 36h
GSDv1 36hGSDv1 24h
GSD_noah 24h GSD_noah 36h
Model-Observationat 24h and 36h FCST
Warm bias in West,cold bias in East
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Domain Average of T2 Bias at 25km
CONUS West
Central East
Obvious diurnal cycle in T2 bias
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Domain average bias changes with different resolutions
Obvious diurnal cycle in T2 bias
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Sounding for Oakland, CA (OAK72493)
00h 12h
24h 36h
GFDL_MP GFSv15.2. GFSv16beta GSDv0 GSD_noahObs
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T bias for grid spacing at 3km
GFDL_MP *GFSv15.2. ▽GFSv16beta ●GSDv0 ○GSDv1 ◻GSD_noah +
a) 00h
333333 333333
333333 333333
d) 36hc)24h
333333
b) 12h
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Summary The impact of different physics schemes on the heat wave simulation was investigated
with the UFS Short-Range Weather (SRW) application. T2 biases of surface stations tend to have positive values in the western US, and negative
values in the eastern US. The impact of the diurnal cycle is obvious. The GFSv16beta forecasts have strong cold biases at the most of eastern stations.
Land surface model can have strong influences on the T2 bias pattern. Domain average sounding temperature bias show that there is almost no temperature bias
at the initial time, but it increases with time. The GFSv16beta forecasts have a larger temperature bias than the forecasts from GFSv15.2 at all horizontal grid spacing.
The bias pattern is similar for different horizontal grid resolutions. The magnitude of bias increases when the horizontal resolution increases.
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Total cloud cover at 36h FCSTV15.2 v16beta V16beta-v15.2
Larger cloud cover in v16beta
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RH bias at 36h FCST
V15.2 v16beta
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25km 13km
3km