I am implementing a high resolution model(1km horizontally) with 40 vertical levels in the Yellowsea and Bohai sea. The model was developed by somebody else in the beginning and I am trying to optimize and validate the model. As I am kind of new to ocean modelling, so I need to seek advice on the problems I've encountered.
The model was running on a rotated grid, we have one open boundary on the east side. The initial and boundary conditions was interpolated from HYCOM analysis 1/12 degree global model. And the model was forced with the tidal forcing from TPXO7.2 on the open boundary. We use BULK_FLUXES with atmospheric forcing from ERA-interim. The solar and thermal radiation was computed from the 12 hour accumulated values, which we only use the 12 and 00 value in the heat flux for ROMS to do the interpolation. The vertical mixing scheme was Mellor-Yamada 2.5 in the model run.
By compare with the HYCOM file and our measurement, the model was overheated a lot in summer near the coast. And also the vertical temperature profile was not realistic compare to our observation.
The comparison of the surface temperature is shown in the figure below.
- YSM_surface.png (76.73 KiB) Viewed 2953 times
- HYCOM_surface.png (52.59 KiB) Viewed 2953 times
- CTD stations.jpg (59.58 KiB) Viewed 2950 times
- T_profile_s1.png (5.93 KiB) Viewed 2950 times
- T_profile_s9.png (6.41 KiB) Viewed 2950 times
Our measurement was taken in July, and the region should be in the tidal mixing front in the Yellowsea, it seemed that the model did not perform very well in this region with the MY2.5 scheme. Are there any suggestions or experience for setup models in similar places?
Thanks very much for your patient and time for looking at this long post.
Some of the log files are attached below.
Code: Select all
Yellow Sea
Operating system : Linux
CPU/hardware : x86_64
Compiler system : ftn
Compiler command : /opt/cray/craype/2.4.2/bin/ftn
Compiler flags : -O3 -free
Input Script :
SVN Root URL : https:://myroms.org/svn/src
SVN Revision : exported
Local Root : /work/users/fanlin/roms_kate_ser
Header Dir : /work/fanlin/roms_kate_ser/Apps/Arctic
Header file : yellowsea.h
Analytical Dir: /work/fanlin/roms_kate_ser/Apps/Arctic
Resolution, Grid 01: 0824x0785x040, Parallel Nodes: 256, Tiling: 016x016
Physical Parameters, Grid: 01
=============================
172800 ntimes Number of timesteps for 3-D equations.
60.000 dt Timestep size (s) for 3-D equations.
10 ndtfast Number of timesteps for 2-D equations between
each 3D timestep.
1 ERstr Starting ensemble/perturbation run number.
1 ERend Ending ensemble/perturbation run number.
-1 nrrec Number of restart records to read from disk.
T LcycleRST Switch to recycle time-records in restart file.
1440 nRST Number of timesteps between the writing of data
into restart fields.
1 ninfo Number of timesteps between print of information
to standard output.
T ldefout Switch to create a new output NetCDF file(s).
240 nHIS Number of timesteps between the writing fields
into history file.
1440 ndefHIS Number of timesteps between creation of new
history files.
1 ntsAVG Starting timestep for the accumulation of output
time-averaged data.
2880 nAVG Number of timesteps between the writing of
time-averaged data into averages file.
2880 ndefAVG Number of timesteps between creation of new
time-averaged file.
1.0000E+01 nl_visc2 NLM Horizontal, harmonic mixing coefficient
(m2/s) for momentum.
F LuvSponge Turning OFF sponge on horizontal momentum.
F LtracerSponge(01) Turning OFF sponge on tracer 01: temp
F LtracerSponge(02) Turning OFF sponge on tracer 02: salt
1.0000E-06 Akt_bak(01) Background vertical mixing coefficient (m2/s)
for tracer 01: temp
1.0000E-06 Akt_bak(02) Background vertical mixing coefficient (m2/s)
for tracer 02: salt
1.0000E-05 Akv_bak Background vertical mixing coefficient (m2/s)
for momentum.
5.0000E-06 Akk_bak Background vertical mixing coefficient (m2/s)
for turbulent energy.
5.0000E-06 Akp_bak Background vertical mixing coefficient (m2/s)
for turbulent generic statistical field.
3.0000E-04 rdrg Linear bottom drag coefficient (m/s).
2.0000E-03 rdrg2 Quadratic bottom drag coefficient.
2.0000E-02 Zob Bottom roughness (m).
2.0000E+00 blk_ZQ Height (m) of surface air humidity measurement.
2.0000E+00 blk_ZT Height (m) of surface air temperature measurement.
1.0000E+01 blk_ZW Height (m) of surface winds measurement.
1 lmd_Jwt Jerlov water type.
2 Vtransform S-coordinate transformation equation.
4 Vstretching S-coordinate stretching function.
7.0000E+00 theta_s S-coordinate surface control parameter.
2.0000E+00 theta_b S-coordinate bottom control parameter.
10.000 Tcline S-coordinate surface/bottom layer width (m) used
in vertical coordinate stretching.
1025.000 rho0 Mean density (kg/m3) for Boussinesq approximation.
42124.000 dstart Time-stamp assigned to model initialization (days).
41273.000 tide_start Reference time origin for tidal forcing (days).
19000101.00 time_ref Reference time for units attribute (yyyymmdd.dd)
3.6000E+02 Tnudg(01) Nudging/relaxation time scale (days)
for tracer 01: temp
3.6000E+02 Tnudg(02) Nudging/relaxation time scale (days)
for tracer 02: salt
3.6000E+02 Znudg Nudging/relaxation time scale (days)
for free-surface.
3.6000E+02 M2nudg Nudging/relaxation time scale (days)
for 2D momentum.
3.6000E+02 M3nudg Nudging/relaxation time scale (days)
for 3D momentum.
1.2000E+02 obcfac Factor between passive and active
open boundary conditions.
Lateral Boundary Conditions: NLM
============================
Variable Grid West Edge South Edge East Edge North Edge
--------- ---- ---------- ---------- ---------- ----------
zeta 1 Closed Closed Chapman Imp Closed
ubar 1 Closed Closed Shchepetkin Closed
vbar 1 Closed Closed Shchepetkin Closed
u 1 Closed Closed Rad + Nud Closed
v 1 Closed Closed Rad + Nud Closed
temp 1 Closed Closed Rad + Nud Closed
salt 1 Closed Closed Rad + Nud Closed
tke 1 Closed Closed Closed Closed
uice 1 Closed Closed Gradient Closed
vice 1 Closed Closed Gradient Closed
aice 1 Closed Closed Mixed Closed
hice 1 Closed Closed Mixed Closed
tisrf 1 Closed Closed Mixed Closed
snow_thick 1 Closed Closed Mixed Closed
sfwat 1 Closed Closed Mixed Closed
Activated C-preprocessing Options:
YELLOWSEA Yellow Sea
ADD_FSOBC Adding tidal elevation to processed OBC data.
ADD_M2OBC Adding tidal currents to processed OBC data.
ALBEDO_CURVE Shortwave radiation adjusted by albedo curve.
ANA_BSFLUX Analytical kinematic bottom salinity flux.
ANA_BTFLUX Analytical kinematic bottom temperature flux.
ANA_NUDGCOEF Analytical spatially varying nudging time-scales.
ASSUMED_SHAPE Using assumed-shape arrays.
AVERAGES Writing out time-averaged nonlinear model fields.
BULK_FLUXES Surface bulk fluxes parameterization.
CORE_FORCING Humidity from CORE forcing files.
CURVGRID Orthogonal curvilinear grid.
DJ_GRADPS Parabolic Splines density Jacobian (Shchepetkin, 2002).
DOUBLE_PRECISION Double precision arithmetic.
EMINUSP Compute Salt Flux using E-P.
ICE_ADVECT Advection of ice tracers.
ICE_ALB_EC92 Ebert and Curry albedo formula.
ICE_BULK_FLUXES Ice bulk fluxes from the atmosphere.
ICE_EVP Elastic-viscous-plastic ice rheology.
ICE_MK Mellor-Kantha ice thermodynamics.
ICE_MODEL Include sea ice model.
ICE_MOMENTUM Compute ice momentum equations.
ICE_SMOLAR Advect ice tracers with MPDATA scheme.
ICE_THERMO Include ice thermodynamics.
LIMIT_BSTRESS Limit bottom stress to maintain bottom velocity direction.
KANTHA_CLAYSON Kantha and Clayson stability function formulation.
LONGWAVE_OUT Compute outgoing longwave radiation internally.
MASKING Land/Sea masking.
MIX_S_UV Mixing of momentum along constant S-surfaces.
MPI MPI distributed-memory configuration.
MY25_MIXING Mellor/Yamada Level-2.5 mixing closure.
NONLINEAR Nonlinear Model.
NONLIN_EOS Nonlinear Equation of State for seawater.
NO_SCORRECTION_ICE Not including SCORRECTION under the ice.
NO_WRITE_GRID Not Writing grid arrays into NetCDF ouput files.
N2S2_HORAVG Horizontal smoothing of buoyancy and shear.
POWER_LAW Power-law shape time-averaging barotropic filter.
PROFILE Time profiling activated .
K_GSCHEME Third-order upstream advection of TKE fields.
RADIATION_2D Use tangential phase speed in radiation conditions.
RAMP_TIDES Ramping tidal forcing for one day.
RST_SINGLE Single precision fields in restart NetCDF file.
SALINITY Using salinity.
SOLAR_SOURCE Solar Radiation Source Term.
SOLVE3D Solving 3D Primitive Equations.
SPLINES Conservative parabolic spline reconstruction.
SSH_TIDES Add tidal elevation to SSH climatology.
TS_U3HADVECTION Third-order upstream horizontal advection of tracers.
TS_C4VADVECTION Fourth-order centered vertical advection of tracers.
UV_ADV Advection of momentum.
UV_COR Coriolis term.
UV_U3HADVECTION Third-order upstream horizontal advection of 3D momentum.
UV_C4VADVECTION Fourth-order centered vertical advection of momentum.
UV_QDRAG Quadratic bottom stress.
UV_TIDES Add tidal currents to 2D momentum climatologies.
UV_VIS2 Harmonic mixing of momentum.
UV_SMAGORINSKY Smagorinksy-like time-dependent viscosity coefficients.
VAR_RHO_2D Variable density barotropic mode.
VISC_3DCOEF Horizontal, time-dependent 3D viscosity coefficient.
