Ocean Modeling Discussion

Hi All, I have a question regarding the diagnostic terms from the ROMS outputs. Do we need to rotate the diagnostic terms (all 2D and 3D momentum terms and also temperature diagnostic terms (advection etc)) using grid rotation angle? I would be grateful for any suggestions in this regard Thanks in ...

Hi All, I am also not able to provide more than one processor for the SWAN model. I am trying to run the SANDY_Coupled Test case and I am getting the following error. Timing for main: time 2012-10-28_12:01:00 on domain 2: 2.76283 elapsed seconds Timing for main: time 2012-10-28_12:01:00 on domain 2 ...

Hi Forum, I have a question regarding the calculation of the surface geostrophic currents from ROMS as U geo =(g/f)X delta(SSHA) [Please see the attached complete equation] Can I directly use the "zeta" field from ROMS? Or Do I have to subtract the Mean Dynamic Topography from ROMS zeta? :shock ...

Hi All,

I want to understand how sea surface elevation(zeta) is calculated in ROMS, I searched in the Wikiroms but did not get much information . I would be grateful if anybody can suggest that from where I can find these details.

Thanking you all in advance.

Hi Kate,
Thanks for your reply. I have one more question, what value I should choose for Tnudg (TNUDG) in days?. If I want to use the SCORRECTION. Thanks again for your support and time.

Hi Kate, I found from the ROMS wiki that the surface salt flux with the RELAXATION is calculated as follows, " F_mod(:,:) = - Tnudg(isalt) * Hz(:,:,N) * [S_mod(:,:,N) - SSS(:,:)] where Tnudg is a nudging time scale and Hz(:,:,N) is upper level thickness and Sea surface salinity (SSS) climatology ...

Hi Kate Thanks for your reply. :) . I have one more question. :shock: I have rivers in my model domain and also i have activated the BULK_FlUX option. I just want to know that, is there a way to "keep the surface freshwater flux unaffected" by the river inputs (Low Salinity and Temperature)which i ...

Hi all, I was trying to understand the salt flux parameterization in ROMS. From the literature, I understand that there are virtual salt flux are real freshwater flux methods. Which one ROMS use when BULK_FLUX is on?. How can I get more information in this regard?. I would be grateful for any ...

Hi All, I want to calculate the salinity budget in my domain. I activated the DIAGNOSTICS_TS, but the values of salt_hadv and salt_vadv terms look very high :shock: compared to the other terms. What could be the possible reasons for this? :roll: Any suggestions would be of great help. Here I am ...

Hi John,

I want to try giving daily boundary values of tracers (to try Nudging) from HYCOM in my model domain for inter-annual simulations. I would be grateful if you can share the matlab code (which you mentioned here)for handling the HYCOM data.

Thanks in advance.

Hi All, I have a question regarding the precipitation forcing. While preparing the Precipitation forcing file for my ROMS model, I am confused with the range of rainfall values between the TRMM and GPCP daily data. Both data files say that both are in units of mm/day. Here I am attaching the ...

Hi Kate,
I will try your suggestions and will reply. Thanks again for your support .

Hi Kate, As you suggested, I turned off EMINUSP option to prevent evaporation, but I got an error message asking for swflux as follows. INQUIRE - unable to find requested variable: swflux in files: Since my experiment is with no evaporation, can i give swflux, which is (E-P) as just (-P with unit ...

Hi Kate Thanks for the suggestions, I understand from one of your earlier post also that, I can set the values in set_vbc.F as follows, # elif defined SRELAXATION stflx(i,j,isalt)=-Tnudg(isalt,ng)*Hz(i,j,N(ng))* & # if defined SALTEXPT & 36.0_r8* endif & (t(i,j,N(ng),nrhs,isalt)-sss(i,j)) # endif Am ...

Hi Forum, I want to set the salinity relaxation for 10 Days and boundary nudging for different timescale say 30 Days. I understand from the forum and documentations that TNUDG is used common for both the cases(If i am not wrong :shock: ). So how can I solve this ?. I would be grateful for any ...

Hi Kate,
Thanks for the suggestion, I will try that. And regarding precipitation, can I provide precipitation with zero values through my netcdf file?

Hi Forum, I wanted to do experiments with the salinity flux, for this I want to run by making the precipitation zero and different run with evaporation zero. Will it be correct if I provide precipitation with zero values through my netcdf file?. Since I am using bulk flux how can i turn off ...

Hi Kate, I couldn't reply soon. :roll: I have open boundaries in my domain and rivers are entering from the grid points in the land-ocean boundary. I am using BULK_FLUXES option and also with EMINUSP. With the EMINUSP option switched on, I didn't get your point that "we don't evaporate at the ...

Hi Matheus, Thanks for your kind reply, I had started my installation with Pyroms only, I downloaded pyroms from the following link https://github.com/kshedstrom/pyroms/ and installed all the long list of prerequisite packages and their prerequisites, mentioned in that site, with much effort. But ...

Hi All, I was trying to use the python tool for my preprocessing and I installed Octant successfully. But I am getting the following error while loading the octant libraries. >>> from octant.grid import * >>> from scipy.io import matlab >>> from numpy import * >>> import scipy.interpolate as ...

Dear ROMS Users/Developers, When I was trying to use the matlab preprocessing script to create initial condition files from an ocean analysis data sets, After the interpolation, abnormal values of temperature and salinity are getting. The results after running the d_initial.m file is as follows ...

Hi ROMS Users/Developers I am confused about the data which should be given as input for the matlab script provided with ROMS called d_initial.m. Can anybody show the header information of the OA file like what is used in d_initial.m? My Doubts are 1) Should I give an input having regridded to ROMS ...

Dear Users/Developers, I was trying to plot cross-sections using ROMS plotting package and I could create my preliminary plots. But I was not able to change the X-Axis units from kilometer to degrees. I would be grateful if anybody can point out the options which I have to get use for getting ...

Hi ROMS Developers/Users, I wanted to add river in my model domain and the forum was very useful for giving an insight to how this is done in ROMS. But I am not clear about how the mass conservation will be taken care of by the model when river discharge is added. Any kind of suggestions will be ...

Dear ROMS Users/Developers I am still in the beginning stage of understanding the ROMS model and I am confused regarding the calculation of NAVG and NDEFAVG. Things were easier in case of a 360 Days calendar with 30 days in a month set up. Suppose my timestep is 600 seconds and if I want to get ...