[Wrf-users] How to deal with the problem that Typhoon Intensity is underestimated?

[Eric Altshuler]

Hello 孙佳, 


Your inner domain resolution of 10 km is probably insufficient to resolve the inner core and the processes responsible for typhoon intensification. You may want to use a triple nest with the inner domain 5 km or finer, e.g. 45/15/5, 36/12/4, 27/9/3, if your computing resources allow this high resolution. Also, different choices of physics parameterizations can strongly affect storm intensity. 


Best regards, 



Eric L. Altshuler 
Research Scientist 
Center for Ocean-Land-Atmosphere Studies 
253 Research Hall, Mail Stop 6C5 
George Mason University 
4400 University Drive 
Fairfax, VA 22030 USA 

E-mail: ela at cola.iges.org 
Phone: (703) 993-5725 
Fax: (703) 993-5770 

----- Original Message -----
From: "孙佳" <sunjiaouc at sina.com> 
To: "wrf-users" <wrf-users at ucar.edu> 
Sent: Monday, December 16, 2013 9:19:08 PM 
Subject: [Wrf-users] How to deal with the problem that Typhoon Intensity is underestimated? 


Dear all, 
Thank you for your time at first! 
I have run WRF to study a typhoon case and the result shows a good path but an underestimated intensity. Do you know how to improve the estimated intensity accuracy? 

FYI, JMA best track data gives a minimum SLP of 940hPa and a maximum wind speed of 50m/s while my WRF output shows only 960hPa and 30m/s, respectively. 

The following is my namelist set, and at the same time my resolution is 30/10 Km. 


&physics 
mp_physics = 2, 2, 
ra_lw_physics = 1, 1, 
ra_sw_physics = 1, 1, 
radt = 10, 10, 
sf_sfclay_physics = 1, 1, 
sf_surface_physics = 2, 2, 
bl_pbl_physics = 1, 1, 
bldt = 0, 0, 
cu_physics = 1, 1, 
cudt = 0, 0, 
isfflx = 2, 
isftcflx = 2, 
ifsnow = 0, 
icloud = 1, 
surface_input_source = 1, 
num_soil_layers = 4, 
sf_urban_physics = 0, 0, 
maxiens = 1, 
maxens = 3, 
maxens2 = 3, 
maxens3 = 16, 
ensdim = 144, 
sst_update = 1, 
/ 

&fdda 
/ 

&dynamics 
w_damping = 0, 
diff_opt = 1, 
km_opt = 4, 
diff_6th_opt = 0, 0, 
diff_6th_factor = 0.50, 0.50, 
base_temp = 290., 
damp_opt = 0, 
zdamp = 5000., 5000., 
dampcoef = 0.2, 0.2, 
khdif = 0, 0, 
kvdif = 0, 0, 
non_hydrostatic = .true., .true., 
moist_adv_opt = 1, 1, 
scalar_adv_opt = 1, 1, 
/ 

2013-12-17 

Jia, SUN 
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