Search found 26 matches
- Thu Mar 14, 2024 8:42 am
- Forum: ROMS Discussion
- Topic: ROMS Radiation Boundary condition (RadNud)
- Replies: 11
- Views: 5877
Re: ROMS Radiation Boundary condition (RadNud)
Bonjour I'd like to make two points: 1- OBCs are designed to handle both physical and numerical modes, and are probably more useful for the latter. This is probably why, in all our long-term simulations, Orlansky-type radiation conditions (in the active/passive approach) outperformed all others in t...
- Fri Dec 04, 2020 9:18 am
- Forum: ROMS Usage
- Topic: Differences with CROCO
- Replies: 6
- Views: 12416
Re: Differences with CROCO
NEW_S_COORD in CROCO corresponds to Vstretching=4 in ROMS/COAWST (first introduced in ROMS-UCLA in 2010)
- Sat Jun 02, 2018 5:33 am
- Forum: ROMS Discussion
- Topic: Nonbreaking wave-induced mixing in ROMS?
- Replies: 8
- Views: 15165
Re: Nonbreaking wave-induced mixing in ROMS?
Hi Kate, note that nonbreaking-wave-induced mixing and Langmuir turbulence are generally considered two different processes of wave-induced mixing (related to Stokes drift)... Patrick
- Fri Jun 01, 2018 5:54 am
- Forum: ROMS Discussion
- Topic: Nonbreaking wave-induced mixing in ROMS?
- Replies: 8
- Views: 15165
Re: Nonbreaking wave-induced mixing in ROMS?
For wave‐induced vertical mixing in KPP, see Wang et al., JGR 2010, based on Qiao et al, JPO 2004. It is now part of CROCO (ROMS_AGRIF)
- Thu Oct 08, 2015 8:08 am
- Forum: ROMS Results
- Topic: The problem about creating an idealized warm ocean eddy
- Replies: 5
- Views: 11591
Re: The problem about creating an idealized warm ocean eddy
a square vortex is possible, but you need some resonant vortex Rossby waves. See this plot by Schubert et al. (1999). I also heard that G. Roullet (LPO, France) has presented some results at the Ocean Sciences meeting where he could make a square vortex using some flux-corrected advection schemes ...
- Thu Oct 01, 2015 5:34 am
- Forum: ROMS Problems
- Topic: CPU time and MPI issues with nested grids
- Replies: 18
- Views: 29789
Re: CPU time and MPI issues with nested grids
just a precision. ROMS_AGRIF also uses a full stencil at the interface (nesting with 1:1 gives the same results as no nesting at all). The model runs stably with 1:5 ratio, which gives excellent results in 2-way nesting (1:3 is preferable for 1-way nesting, because the solutions are naturally less s...
- Wed Sep 23, 2015 5:48 am
- Forum: ROMS Discussion
- Topic: Error encountered in compiling jobcomp using Romstools
- Replies: 8
- Views: 6867
Re: Error encountered in compiling jobcomp using Romstools
Hi, please use the ROMS-AGRIF forum for your problem ... Patrick
- Sun May 17, 2015 10:15 am
- Forum: ROMS Discussion
- Topic: Simulation of Standing Waves Using ROMS
- Replies: 5
- Views: 4856
Re: Simulation of Standing Waves Using ROMS
yes Kate, we have done the TANK test case in the homogeneous and two-layered fluid (internal soliton) using a non-hydrostatic version of ROMS_AGRIF. We can accurately reproduce both the hydrostatic and non-hydrostatic analytical solutions in the homogeneous case and lab experiments in the two-layer ...
- Tue Mar 31, 2015 5:59 am
- Forum: ROMS Discussion
- Topic: Full vorticity equations
- Replies: 5
- Views: 8092
Re: Full vorticity equations
Couvelard X., P. Marchesiello, L. Gourdeau, and J. Lefevre, 2008: barotropic zonal jets induced by islands in the southwest Pacific. Journal of Physical Oceanography, 38, 2185-2204.
- Tue Oct 14, 2014 5:27 am
- Forum: ROMS Bugs
- Topic: WET_DRY and Dcrit
- Replies: 13
- Views: 16013
Re: WET_DRY and Dcrit
The implicit correction of Lemarié et al. (2012) fixes the problem for us (in ROMS_AGRIF). We implemented it for both interior diffusion (bi-laplacian) and sponges (laplacian) and WET_DRY runs without any problem in all configurations (e.g., with wetting-drying cells in sponge areas).
- Wed Jan 22, 2014 8:50 am
- Forum: ROMS Problems
- Topic: ROMS_AGRIF periodic domains and mpi -- user error or bug?
- Replies: 2
- Views: 3596
Re: ROMS_AGRIF periodic domains and mpi -- user error or bug
See answer and bug fix report in ROMS_AGRIF forum:
https://gforge.inria.fr/forum/?group_id=735
Patrick
https://gforge.inria.fr/forum/?group_id=735
Patrick
- Tue Oct 01, 2013 7:13 am
- Forum: ROMS Bugs
- Topic: Possible Bugs in Radiation OBC in t3dbc_im.F
- Replies: 2
- Views: 4459
Re: Possible Bugs in Radiation OBC in t3dbc_im.F
Hi Hernan, could that explain the "inconsistency" between surface bulk formulations and OBCs in the simulations that you presented in Rio last year?
- Mon Jun 24, 2013 7:35 am
- Forum: ROMS Discussion
- Topic: Marchesiello's RSUP3 in ROMS?
- Replies: 9
- Views: 7177
Re: Marchesiello's RSUP3 in ROMS?
Since the response is slow to come, I will give my understanding of the status of RSUP3. The RSUP3 scheme presented in Marchesiello et al. (2009) was first implemented in the ROMS_AGRIF version and we had some success with it on various applications. Then, a form of it was implemented in the Rutgers...
- Mon Jun 04, 2012 6:35 am
- Forum: ROMS Discussion
- Topic: A simple question about default obc in old version roms
- Replies: 9
- Views: 12100
Re: A simple question about default obc in old version roms
I think that this discussion demonstrates the fact that users should not have to choose their combination of OBCs (unless they really want to). in the ROMS_AGRIF version, there is a default set of choices which avoids a lot of trouble for users and a much faster start up. concerning 2D radiative con...
- Wed Jan 25, 2012 7:29 am
- Forum: ROMS Bugs
- Topic: is LMD constancy preserving
- Replies: 9
- Views: 10614
Re: is LMD constancy preserving
Hi Sasha, Thanks for the details on the radiative heating choices. I understand the issue of Bflux changing sign with depth and how it may affect the physical consistency of nonlocal mixing. This is a good point that leaves us with interesting physical issues. Note that we are well aware of the &quo...
- Tue Jan 24, 2012 5:13 pm
- Forum: ROMS Bugs
- Topic: is LMD constancy preserving
- Replies: 9
- Views: 10614
Re: is LMD constancy preserving
Hi Sasha, In your formulation you use : NonLocalFlux = C * G(sigma) * SurfaceForcingFlux taking: SurfaceForcingFlux = stflx(i,j,itemp) - srflx(i,j) But in Large et al. (1994) SurfaceForcingFlux also contains the radiative heat absorbed in the boundary layer (at level sigma) as it was believed to con...
- Sat Dec 17, 2011 12:05 pm
- Forum: ROMS Tools and Techniques
- Topic: TPXO to ROMS EXPRESS (tide extraction software)
- Replies: 110
- Views: 3620007
Re: TPXO to ROMS EXPRESS (tide extraction software)
Hi John, make_tides now reads TPXO7 but we will look at your routines. The management and corrections of tidal phase and amplitude needed in the case of real time forcing is not straightforward. If you simplified some of the treatment processes, that would be interesting to us as well. We may want t...
- Fri Dec 16, 2011 9:46 am
- Forum: ROMS Tools and Techniques
- Topic: TPXO to ROMS EXPRESS (tide extraction software)
- Replies: 110
- Views: 3620007
Re: TPXO to ROMS EXPRESS (tide extraction software)
For information, the romstools package (provided with the agrif version of roms) also has a tidal toolbox (in matlab) that processes TPXO for ROMS. It is called make_tides ...
- Wed Nov 09, 2011 9:14 am
- Forum: ROMS Problems
- Topic: sponge layer for biharmonic viscosity
- Replies: 4
- Views: 6009
Re: sponge layer for biharmonic viscosity
Did you try and reduce the hyperviscosity coefficient? the rotation of biharmonic tensor induces large vertical fluxes that violate stability constraints (see Marchesiello et al. 2009). Clipping of hyperviscosity is needed in this case ...
- Wed Oct 12, 2011 3:53 pm
- Forum: ROMS Discussion
- Topic: advection and spurious mixing
- Replies: 16
- Views: 18289
Re: advection and spurious mixing
the circulation is not that affected by local extrema (unless out of control) but is greatly affected by diapycnal mixing.
a discussion on the need for monotonicity is good of course ...
a discussion on the need for monotonicity is good of course ...
- Wed Oct 12, 2011 3:09 pm
- Forum: ROMS Discussion
- Topic: advection and spurious mixing
- Replies: 16
- Views: 18289
Re: advection and spurious mixing
monotonocity is far from being the only issue with tracer advection. An example of lock exchange experiment in different models is given by Flavien Gouillon (PhD thesis) at http://coaps.fsu.edu/~gouillon/Spurious.html again, monotone schemes have implicit diffusion, which becomes a problem with stee...
- Wed Oct 12, 2011 2:08 pm
- Forum: ROMS Discussion
- Topic: advection and spurious mixing
- Replies: 16
- Views: 18289
Re: advection and spurious mixing
The scheme in Marchesiello et al (2009), let's call it RSUP3, is not meant to outperform UP3 (the standard ROMS upstream-biased advection scheme) in terms of numerical properties (accuracy, dispersion ...). It is only an attempt to correct excess diapycnal mixing that arises with steep slopes (even ...
- Tue Oct 11, 2011 4:28 pm
- Forum: ROMS Discussion
- Topic: advection and spurious mixing
- Replies: 16
- Views: 18289
Re: advection and spurious mixing
I did not have much success with the Akima advection scheme. I think that the only progress from the scheme proposed in Marchesiello et al. (2009) is coming from Lemarié et al. (a paper that will soon be published). It is a significant update from my work that will allow isopycnal mixing (with no ad...
- Fri Aug 22, 2008 1:18 am
- Forum: ROMS Discussion
- Topic: Operating ROMS nowcast/forecast models
- Replies: 3
- Views: 4918
Re: Operating ROMS nowcast/forecast models
We have also recently proposed a nowcast/forecast system over New Caledonia: http://prevision.ird.nc/ (look at PREVISIONS/OCEAN). It is based on a protable package developped as part of the Romstools (IRD team). Our New Caledonia system is presented in the July 2008 MERCATOR Newsletter n°30: http://...
- Fri Jul 06, 2007 4:36 am
- Forum: Job Opportunities
- Topic: Hydrodynamic and cosystem modeler, IRD New Caledonia
- Replies: 0
- Views: 2962
Hydrodynamic and cosystem modeler, IRD New Caledonia
A 1-year postdoctoral position in regional modeling is available in the oceanographic lab of the IRD center of New Caledonia. The funding project is an integrated study of the relation between ecological conditions and tuna fisheries with a focus on regional ENSO and climate impacts. The person sele...
- Fri May 11, 2007 2:50 am
- Forum: ROMS Discussion
- Topic: diapycnal mixing in 3rd order "horizontal" advecti
- Replies: 0
- Views: 2570
diapycnal mixing in 3rd order "horizontal" advecti
Hi, I would like to report a problem with ROMS 3rd order "horizontal" advection scheme for tracer advection. This scheme is a very nice compromise between quality (no dispersion, quasi-monotonic) and CPU cost (see Shchepetkin, 1998). However, when applied to sigma coordinate models the iss...