Ocean Modeling Discussion

Hi Kate, Thanks for your comments! Forgive me for not having knowledge of ROMS lingo. I get those doubts when I try to figure out why ROMS tidal elevation is about 20% below the insitu data in my tidal case. Some parameters like surface/bottom roughness, drag coefficient, may relate to my problem bu...

Hi all, I have some doubts about water transport at OBC when imposing tides. Hopes I can get some tips here. 1.Does topography cut off contribute the inaccuracy of water transport especially at OBC which water goes in and out and how do we deal with it if it does? ROMS needs a topography cut off to ...

Hi Kate, Well, the figures above are exactly from the versions before and after SPLINES changes. I carefully read and compare ROMS codes of these two versions just to find all "SPLINES" cpp options are splited and replaced by "SPLINES_*" in the new version, while the algorithm re...

Hi all, I recently updated my ROMS repositories from revision 761 (Sat, 28 Mar 2015) to revision 838 (Sat, 04 Mar 2017) then I got inconsistent results between these two revisions which has confused me for a while.Hopes I can get some tips here. Attached are 2 monthly averaged plots of two revisions...

Hi Katja,

Thanks for quick reply.
Your might be probably right,a nudging zone for NO3 variable plus a sponge zone for flows can be one way that helps with my boundary problems. I'll try it.

Best, Haiyun

Hi, I'm running ROMS coupling with an biological model(bio_Fennel.in) and meet some boundary problems which puzzled me for quite some time now.Hope I can get some help here. The model domain is 1S~35N,99E~140E with resolution about 7km. HYCOM reanalysis is provided as hydrodynamic initial&bounda...

Dear Kate,
Thanks for your reply.
I got the answer from ROMS codes about time stepping 2d&3d momentum equations(step2d_LE_AM3.F step3d_uv.F) as you noticed.

Hi, I try to figure out how tides is put into ROMS boundary. Following what wikiroms says there are three ways to include tides: 1.You can specify a time-dependent boundary condition file that temporally resolves the tides and skip the tides file entirely. 2.You can specify SSH_TIDES and/or UV_TIDES...

Hi, Good news on our issue! We check the tides at shore and found it unreasonably strong which might cause strong diffusion of thermocline at slope . The temp profile and time series make progress when we don't impose tide. I guess we haven't set our tides correctly.We will double check our tide net...

updates: For wind-current plot I correct my time index to 00Z corresponding to HYCOM time coordinate.Then I can see wind effect at the surface but somehow it didn't simulate the eddy well. There must be something I should have taken care to improve my result (like diffusion coefficient for tracers,w...

Hi, I'm doing an SCS(Southern China Sea) test case using ROMS,but I find my surface current field has little response to the wind field even there is a large scale cyclone. Wind forcing is from ERA_ITERIM 10m wind with BLK_ZW set to 10 and bulk_flux defined . I'm sure ROMS reads the wind because sus...

Hi kate,
Thanks for your reminder.I will read it carefully.

Hi John and Kate,
Follow your ideas I get a better understanding of the procedure of air-sea interchange.I'm not using sea ice model but I will take care when I deal with it in the future.
Thanks for your opinions！

Hi, I am recently reading ROMS code and try to export some of its intermediate variable,but most fields are tiled because ROMS has a parallel computing method. I can see there is a routine that collect tiled array in Utility/distribute.F but I still cannot handle it.is there anyone who has experienc...

Hi,
I'm a little confused weather I should use net solar radiation or downward solar radiation as ROMS input forcing.Could anyone tell me which one is correct and why should we use it ?

Thanks advance.
Haiyun

Hi Rodrigo, Thank you for sharing experience about pge test.I get a better understanding of pge and its influence factor. :wink: Now rx0 is limited to not more than 0.1 and I do the pge test following your idea (sponge,nonlinear temp profile，zero u,v,zeta,etc) The pge test shows improvement compared...

Hi rduran， Thank you for your reply.I make a gif of daily averaged velocity at bottom. The currents are developing all the time and they are obviously too strong.Yes I can see negative vorticity regions along the section line which cause upwelling,your notice is helpful! I think the bottom velocity ...

Two days ago I smoothed the topography then I did a PGE test with no forcing and made some simple cross-section figure to check if there is any false upwelling along the slope. See attachments: There is w velocity cross-section figure with its unit m/day at day30.The figure shows a strong upwelling ...

Hi, I checked Haney number (rx1) field and found it coincide with slopes where upwelling current appeared.I think my rx1 field has a close relationship to the fake upwelling current,but neither clear how HPGE leads to upwelling nor know how to decrease rx1 factor directly. Has anyone experienced thi...

Hi, I have a south china sea（SCS) modelling case using HYCOM data for ROMS initial field and boundary field.My temp field has a difference from HYCOM. Configurations The domain is 95~134E and 1~35N and we have spatial varying horizontal resolution from 10km to 5km.For vertical parameterization we ta...

Hi there, I increase vertical level number from 30 to 40 and take k-kl parameters for GLS mixing instead folowing Javier's idea.Attachment shows that MLD changes little which indcates the problem relates to somthing else.I am gonna compare my forcing field with HYCOM forcing field if there is much d...

I am writing to respond Javier that the MLD in your temperature profile looks better than Yong Chen's. Yong Chen and I will do the test following your idea.Thanks!