Ocean Modeling Discussion

Dear ROMS Ecosystem users, I am using the FENNEL bio model with CARBON and DENITRIFICATION #define BIO_FENNEL #ifdef BIO_FENNEL # define CARBON # define DENITRIFICATION # define BIO_SEDIMENT # define DIAGNOSTICS_BIO #endif and I would like to impose a surface flux of alkalinity Does anybody know how ...

Dear Dan,

Yes, the boxes are the model domains, and yes, the smaller domain is nested on the the larger domain. The Data Assimilation is working only in the larger domain. If you have any questions please feel free to contact me directly in my email ivan@atlantech.com.br

Best,

Dear Patrick, thank you for replying.

I actually got an answer from Michael McDonald in the Hycom forum. He point me to the link https://www.hycom.org/dataserver/gofs-3pt1/reanalysis where I was able to download the long term mean SSH in NetCDF format.

Best Regard,

Ivan

Dear Eiki, this is what I do: In the hycom.org website, on the left side menu, bellow Data Server, select GOFS3.1 then, select ACCESS DATA HERE then, GLBv0.08/expt_53.X (Jan-01-1994 to Dec-30-2015) then, (2005) Reanalysis Data: 2005 to 2005 (3-hrly) then, NetcdfSubset: //ncss.hycom.org/thredds/ncss ...

Dear , the error code 400 in your message means the server didnt find what you are requesting. The 400 Bad Request Error is an HTTP response status code indicating that the server was unable to process the request sent by the client due to invalid syntax. I don't use python and matlab to download ...

Dear s19364,

there are two sets of HYCOM GLBv 0.08 expt 53.x, one has ice and the other doesn't . The set which has ice doesn't have SSH. Make sure you are using the correct one.

Dear forum and ROMS users, I am working on the implementation of Ensemble Optimal Interpolation (ENOI) in a regional domain of ROMS in the North Pacific Ocean (see figure) . I am using 6-hourly Hycom GLBy 0.08 T/S/U/V/SSH in the open boundaries of my ROMS regional grid. I am using the Chapman ...

Dear Robertson,

Thank You for the reply. It is the number of Threads that determine the virtual components, right ?

well, thanks a lot.

Best

Ivan

Dear all, I am running Linux Ubuntu 20.04.3 LTS in a multi-processed PC with 2 sockets, 2 Thread(s) per core and 22 cores per socket (see specs below). In theory I should be able to use 88 cores to run ROMS but it is not happening. I tried different configurations of tiles. I tried ntiles_i = 2 and ...

Hi Kate,

Yes, this is what I mean. I was using the wrong units. Thanks for warning me about the units. I will let you know about the new results.

Thanks

Ivan

Very helpful discussion. Can I add one question ? Following your strategy of using a strong lateral nudging and weak nudging to climatology, if I decide to use a netcdf file to provide the nudging coefficients to the model, what would be the values in this file ? I am trying to use 1 day at the ...

Thanks Kate. I missed this previous discussion.

Cheers

Ivan

Dear all, I am a little confused about nudging. I am sure this subject has already been discussed in the forum but I just can’t find a post that addresses the parameters that control lateral nudging and the ones that control nudging to climatology. I am using ROMS version 839, which I have updated o ...

Hi All, I wonder if someone has a matlab script to prepare the obs file to be used in IS4DVAR that is newer than the one used for WC13. The URL used in that script does not exist anymore. The aviso products were transfered to Copernicus. I would appreciate if someone could share his/hers matlab ...

Thanks a lot.
Your comments have help me a lot.
I will let you know when I succeed running IS4DVAR

cheers

Ivan

Hi Ivica, Thanks a lot for the hints. I guess you are write, 20 cores is not good enough to run a grid this size 601x401x30. I am doing as you said, running the exact and the random methods for the 2D variables only to get some insight of my case. Thanks for the hint. One last question ... Do you ...

Deal All, I am new in the business of 4DVAR. I am trying to implement the IS4DVAR in the Northwest Pacific Ocean. My grid is 601x401x30. I am running the experiments in a Azure Virtual Machine which has 20 cores and is configured with Ubuntu linux. The WC3 test went well in this machine, with both ...

Thanks Kate.

Dear ROMS users, Regarding the use of CLIMATOLOGY AND NUDGING, What is the difference between defining the correct flag in the ocean.h file or choosing F or T in the ocean.in file ? Do I have to do both ? I hope I am not asking something that have already been answered in the past, but looking into ...

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Thank you very much Dr. Wilkin. I was mistakenly thinking that UV was a source of momentum, which was added in the momentum equations, while Q was a source of mass introduced in the continuity equation. The name UV_PSOURCE is confusing, it leads us to think that it is a SOURCE, but it is not since ...

Dear all, Does anybody knows what is the difference between the flags Q_PSOURCE and UV_PSOURCE that we use to make rivers in ROMS ? I am running a few experiments with the Amazon River. Because the Amazon discharge is so large, I had to introduce 1000 sources, so the amount in each source is small ...