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THE SOUTHAMPTON - EAST ANGLIA (SEA) MODEL

The Southampton - East Anglia model is a three-dimensional finite difference, primitive equation, ocean general circulation model (OGCM), based around the successful Bryan-Semtner-Cox formulation. It is designed to give good performance on high powered workstations, clusters of workstations and message passing massively parallel processing systems, rather than vector processors.

VERSION:        3.1
DATE:           December 1998
AUTHOR:         Matthew I. Beare
                School of Mathematics
                University of East Anglia
                Norwich  NR4 7TJ

For further information:

WWW:            http://www.mth.uea.ac.uk/ocean/SEA
E-MAIL:         SEA@mth.uea.ac.uk

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Updates: v3.0 --> v3.1

1. Added option to accumulate a set of diagnostics over time (-Ddiags_time)

        Created: diags/model
                   - new directory structure for diagnostic files
                 utils/post-diag.F
                   - post processing routine for diagnostics

        Updated: src/diags.F
                   - added three subroutines: init/accum/write_time_diags
                 include/cdiag.h
                   - added /diag/ common block (for "sea" and "post-diag")
                 src/init.F
                   - added call to "init_time_diags"
                 src/sea.F
                   - added calls to "accum_time_diags" & "write_time_diags"

        *** NB: Have not yet completed HDF post processing, only UFM ***

2. Removed redundant arrays: ggu(j) and hhu(j)

Updated: src/init.F and include/chmix.h

3. Added biharmonic mixing option (-Dbiharmonic) to be used as well as

or instead of the usual Laplacian operator. Requires "am_bi" and "ah_bi" to be set. To switch off Laplacian operator, simply set "am" and "ah" to zero.

        Created: include/delsq.h
                   - declaration of common delsq array
                 src/delsq.F
                   - subroutines to calc delsq for clinic and tracer
        Updated: include/fields.h
                   - include extra outer halo in array declarations
                 src/sea.F
                   - added include <delsq.F> statement
                 src/init.F
                   - calculate diffusion factors (bbt,..etc.) without am/ah
                   - added additional code to subroutine "check_halos"
                 src/options.F
                   - include code to display selected option
                 src/step.F
                   - added calls to "delsq_u" and "delsq_t"
                 src/tracer.F
                   - added biharmonic diffusion statements
                   - introduced delsqk variable
                 src/clinic.F
                   - added biharmonic diffusion statements
                   - introduced delsqk variable

4. Changed src/step.F to calculate two outer halos before sending,

by default, using "nhalo" to determine whether 1 or 2 halos should be exchanged. Thus less #ifdef coding required for clinic/tracer parts.

5. Optimised clinic and tracer, by splitting loops over k into smaller

segments and using scalars for multiple array references.

6. Fixed bug in subroutine "SPI_Token_Send", in which MPI_Send had an

invalid "request" parameter.

7. Removed file "utils/io_dac.F", as the routines are no longer required,

since i/o is now performed in horizontal plane, not east-west slabs.