RegCM-ROMS Tutorial: Introduction to ROMS Ocean Model
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1 RegCM-ROMS Tutorial: Introduction to ROMS Ocean Model Ufuk Utku Turuncoglu ICTP (International Center for Theoretical Physics) Earth System Physics Section
2 - Outline Outline Introduction Grid generation and smoothing Input files Forcing, initial, boundary conditions etc. Getting ROMS code Configuration of the model Installation Namelist file and running in standalone mode
3 - Introduction (1/2) Basics of the ROMS ocean model ROMS Primitive equations with potential temperature, salinity, and an equation of state Hydrostatic and Boussinesq approximations It supports different advection and mixing schemes It supports point sources and sinks (i.e. river discharge) It has version that is coupled with ice model Horizontal Grid Arakawa C Orthogonal-curvilinear coordinates (with masking of land areas) Support for closed basins (like lakes, inland waters etc.) and domains with periodic and also open boundary conditions Vertical Grid Terrain following sigma coordinate Free surface
4 Steps to create an application (standalone ROMS) - Introduction (2/2) Create input files (also can be generated analytically by Fortran code) Grid Independent from vertical coordinates Forcing (atmospheric, river etc.) create these Boundary Condition (BC) - if domain has open boundaries files after vertical Initial Condition (IC) coordinates Climatology - if nudging and/or relaxation are activated changed Create configuration file (*.h) A set of CPP option must be defined such as advection, mixing, flux calculation etc. Create namelist file (*.in) User needs to edit namelist file based on the created application (additional namelist file exist for ICE model). Run Edit machine specific definitions (Build/*.mk and build.sh) Run the model
5 - Grid Generation (1/7) Grid Generation Tools complex grid Simpler grid Matlab (w and w/o GUI) SEAGRID, GRIDGEN, EASYGRID etc. More info: Python pyroms: has several different versions. It can be also used to create input files
6 - Grid Generation (2/7) Grid Generation Example (with pyroms) Caspian Sea Grid There is no open boundary ETOPO-1 is used for bathymetry Horizontal resolution is ~10 km with 32 sigma layers (theta-s = 7.0, theta-b = 0.2, hmin = 5 m)
7 Grid Generation Example (with pyroms) - Grid Generation (3/7)
8 Grid Generation Example (with pyroms) - Grid Generation (4/7)
9 - Grid Generation (5/7) Grid Generation Example (with pyroms) Grid Stiffness Ratios (indicator for PGE and CFL error) Beckman & Haidvogel Number (1993) " r xo = max Δh % " $ ' = max h h % i i 1 $ ' # 2h & # h i + h i 1 )& Reduced by smoothing. The value should be < 0.25 Haney Number (1991) " r x1 = max z z + z z % i, j,k i 1, j,k i, j,k 1 i 1, j,k 1 $ # z i, j,k + z i 1, j,k z i, j,k 1 z ' i 1, j,k 1 & Reduced by smoothing and vertical coordinate mod. The value should be < 6.0
10 - Grid Generation (6/7) Grid Generation Example (with pyroms) The Matlab smoothing toolbox (LP_Bathymetry) can be also used to fix the bathymetry Bathymetry/
11 - Grid Generation (7/7) Grid Generation Example (with pyroms) Vertical Coordinates Vertical Transformation (opt: 1-2) ( ) z( x, y,σ,t) h x, y Vertical Stretching Functions (opt: 1-4) 2 higher resolution at the surface 3 for shallow applications 4 default in current version of ROMS, user can control stretching both in surface and bottom
12 - Creating Forcing, Initial and Boundary Condition (1/6) ROMS Input Requirements Atmospheric Forcing Surface atmospheric conditions are needed to drive the ocean model These variables are used to calculate heat, momentum and momentum fluxes over the ROMS domain Fields must be interpolated into ROMS grid. The wind components must be rotated to destination grid (in this case ROMS). Unit conversion might be needed Initial Conditions (IC) Initial condition (T,S,U,V) must be given to ocean model. The model can be started from simple vertical temperature and salinity profile with no motion (spin-up run needed and length depends on the application) Boundary Conditions (BC) If domain has open boundary conditions like Mediterranean Sea Input for nudging and/or relaxation Temperature and salinity observations must be interpolated into ROMS ocean model grid. The model try to minimize the difference!!!
13 - Creating Forcing, Initial and Boundary Condition (2/6) ROMS Input Requirements Input files and the required fields can change based on selected CPP options in *.h file. LONGWAVE_OUT: net shortwave flux, downwelling longwave flux, surface temperature, mixing ratio and pressure, wind components, rain LONGWAVE: net longwave flux rather than downwelling longwave flux w/o BULK_FLUXES: wind stress, net heat fluxes, fresh water flux ALBEDO and/or CLOUD: needs cloud fraction as input *_TIDES: needs tidal forcing file with point sources (i.e. rivers) UV_PSOURCE, Q_PSOURCE: needs extra NetCDF forcing files with RegCM coupling BULK_FLUXES+LONGWAVE_OUT+REGCM_COUPLING must be defined for coupled mode (RegCM+ROMS). with nudging and/or relaxation Needs four-dimensional (x,y,z,t) temperature and salinity fields
14 - Creating Forcing, Initial and Boundary Condition (3/6) Tools to create input files 3d interpolation 2d interpolation Matlab ROMS Matlab Package: Python pyroms: ESMF Python Interface: NCL (now supports ESMF offline re-gridding)
15 Initial condition file (with pyroms) - Creating Forcing, Initial and Boundary Condition (4/6) 2d interpolation 3d interpolation The original pyroms python module does not support AGrid (but it could be generated using logic of the BGrid python files) The interpolation weight files are created by SCRIP toolbox (it has a Python wrapper) but it can be modified to use ESMP Info about SCRIP toolbox: Image - Arakawa Grid Types -
16 - Creating Forcing, Initial and Boundary Condition (5/6) Initial condition file (with pyroms) It basically creates the NCO commands to merge the variables into a single file. NCO must be installed before using this method to merge data!!! More information about NCO:
17 - Creating Forcing, Initial and Boundary Condition (6/6) Creating interpolation weight matrix (with pyroms) It creates the interpolation weight matrix. This can be done outside of the pyroms but in this case grid definition netcdf files must be created by user.
18 - Getting ROMS Code (1/1) Getting ROMS code Register New users must be register via following web site. Download Source Code via SVN SVN is a version control system SVN must be installed List of tagged versions: svn ls Checkout: svn co --username [YOUR_USER_NAME] roms-3.5 Ice branch is in the but there is no tagged version. Notes The coupled modeling system currently uses ROMS version 3.5 and user needs to apply small patch to enable coupling. The same patch can be used to create patch for ice version of ROMS
19 - Configuration of the Model (1/1) Header file (*.h) cas.h Ice model related definitions No open boundary E/N/S/W closed The file includes set of preprocessor (CPP) flag to activate specific part of the code. The whole list of the available CPP options - ROMS/Include/cppdefs.h
20 - Installation (1/2) Steps Edit machine specific file (*.mk) Files is in the Compilers/ directory Linux+Intel Fortran Compiler Create case directory This directory is used to run the model The required files *.h (header file) Copy build script (build.sh) from ROMS/Bin directory to case directory Edit build.sh (specify source path, case name, compiler and MPI types etc.) Install ROMS using./build.sh command (this will create oceanm file, if debug option is specified the file name will be oceang) Create input and output directories under case directory Copy grid, forcing, initial and boundary forcing files to input directory
21 build.sh - Installation (2/2)
22 - Running ROMS (1/3) Editing namelist file (*.in) cas.in domain size and number of vertical layer Domain decomposition parameters, must be consistent with job submission script!!! option for restart, NRREC = -1 is fresh run option for output interval
23 - Running ROMS (2/3) Editing namelist file (*.in) cas.in Height of surface atmospheric data Jerlow water type. Related with turbidity and shortwave rad. penetration. 5 is more turbid Vertical grid definition, it must be consistent with input files!!! There are options for input files Options for horizontal and vertical mixing coefficents Options for output fields Options for open boundary conditions
24 - Running ROMS (1/1) Creating run script PBS roms.job Job can be submitted via qsub roms.job command LSF roms.lsf Job can be submitted via bsub < roms.lsf command
25 - End of ROMS Tutorial Last words ROMS is one of the most advanced and complex numerical models in the world. The learning Curve is very steep but it is our experience that the model grows on the user when he/she realizes its capabilities. from user registration form Facts and Suggestions: There is no single tool to create all the input files and setup an application. This needs an additional learning curve and everybody has its own way. Some nice tools are available and can be used but you might need to modify them!!! The ROMS code getting very complex and user needs some experience about ocean modeling. Run the application in standalone mode (only ocean model) and tune it. Do some long run and check the drift!!! After that you can go one step further and couple RegCM-ROMS.
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