Search found 7 matches

by wavewatch
Wed Apr 24, 2019 2:55 am
Forum: ROMS Adjoint
Topic: Inconsistent values of variables in TL initial condition
Replies: 3
Views: 951

Re: Inconsistent values of variables in TL initial condition

Hi,
May I ask if your problem has been solved ?
I had the same problem :( :( :(
by wavewatch
Tue Jul 10, 2018 5:31 am
Forum: ROMS Adjoint
Topic: How to restart the IS4DVAR date assimilation system?
Replies: 0
Views: 822

How to restart the IS4DVAR date assimilation system?

I can successfully run the primal form of incremental, strong constraint, 4-Dimensional Variational (4D-Var) data assimilation algorithm in the California Current System, 1/3 degree resolution, application (WC13). Now I have a question for you: If I complete the assimilation for 7 days, the model st...
by wavewatch
Wed Mar 28, 2018 1:38 am
Forum: ROMS Adjoint
Topic: Initial gradient norm, Gnorm = NaN
Replies: 1
Views: 746

Initial gradient norm, Gnorm = NaN

Hi, everyone! When I run my IS4D-Var model, I got the error at the first inner loop. The log file shows: …… <<<< Descent Algorithm >>>> (001,000): Initial gradient norm, Gnorm = NaN …… TLM: GET_STATE - Read state initial conditions, t = 1 00:00:00 (Grid 01, File: wc13_itl.nc, Rec=0001, Index=1) - fr...
by wavewatch
Mon Mar 26, 2018 7:03 am
Forum: ROMS Adjoint
Topic: Can't run my IS4D-Var case Gnorm = NaN
Replies: 8
Views: 2657

Re: Can't run my IS4D-Var case Gnorm = NaN

Hi, I wonder if you have solved this problem? Now I have the similar error like you in my IS4D-Var run, my initial gradient norm (Gnorm) is NaN. <<<< Descent Algorithm >>>> (001,000): Initial gradient norm, Gnorm = NaN …… TLM: GET_STATE - Read state initial conditions, t = 1 00:00:00 (Grid 01, File:...
by wavewatch
Wed Sep 23, 2015 12:54 am
Forum: ROMS Problems
Topic: The surface net heat flux and solar shortwave radiation
Replies: 1
Views: 1987

The surface net heat flux and solar shortwave radiation

Dear all, I don’t know whether the surface forces——surface net heat flux and solar shortwave radiation ——needs to be input at the same time. If they input at the same time, they will not repeat calculate? Surface net heat flux includes net shortwave radiation flux, net long wave radiation, latent he...
by wavewatch
Fri Jul 03, 2015 1:33 am
Forum: ROMS Problems
Topic: Changing the range would blow up
Replies: 4
Views: 1143

Re: Changing the range would blow up

I try to reduce the timestep from dt=400 to dt=200,the currnt velocity is still more than 2.5 meter per second on the fifth day. In addition, I try to increase horizontal diffusion and viscosity,but it still doesn't work.

Thank you in advance!
by wavewatch
Thu Jul 02, 2015 3:42 am
Forum: ROMS Problems
Topic: Changing the range would blow up
Replies: 4
Views: 1143

Changing the range would blow up

Hello, I am trying to simulate the south China sea current, at the first stage I choose the range : -10—27N,99—140E, and it can run normally. However, when I change the range , -10—27N,99—150E,it blow up after 187 days. Then I try to replace the NCEP wind field with QSCAT, dramatically it still blow...