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May 19, 2004 |
last changed June 8, 2004 |
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OBSERVATION SYSTEM SIMULATION EXPERIMENT |
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OSSE is an MITgcm configuration to simulate data assimilation with a |
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deterministic ensemble Kalman filter and a model of a rotating tank of |
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water with an ice bucket at the center. |
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INSTALLATION |
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At the time of this writing, the OSSE requires MITgcm checkpoint48 to |
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compile and run. MITgcm can be obtained from |
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<http://mitgcm.org/source_code.html>. If downloading from the CVS |
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server, use the command |
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cvs co -r 'checkpoint48' MITgcm |
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in order to specify the correct version. Read the instructions on the |
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the webpage before trying to use the CVS server. |
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The OSSE directory tree can be obtained from the MITgcm CVS repository |
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with the command |
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cvs co MITgcm_contrib/osse |
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The code and its revision history can be browsed at |
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<http://dev.mitgcm.org/cgi-bin/viewcvs.cgi/MITgcm_contrib/osse/> |
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A good place to put the osse directory tree is in MITgcm/verification, |
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where examples and test examples of MITgcm configurations are kept. |
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CONTENTS |
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EnKF: empty |
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build: handy place to compile MITgcm |
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code: modifications to MITgcm to run in cyclindrical coordinates. At |
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the time of this writing, it requires checkpoint48 to compile and run. |
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codemod: modification to MITgcm to run with checkpoint 54. Not quite |
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ready for prime time. |
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da: location for ensemble members and initialization and input files |
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input: initialization and input files for running MITgcm |
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filter: source and data files to run the data assimilation and Kalman |
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filter. |
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run: empty |
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utils: assorted Matlab m-files |
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COMPILING AND TESTING THE MODEL |
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The following series of commands creates the MITgcm executable. |
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From the MITgcm root: |
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cd verification/osse/build |
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../../../tools/genmake -mods=../code # creates makefile |
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make depend # contructs Fortran code from model codebase |
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make # makes executable mitgcmuv |
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Try a test run, while redirecting the standard output to a file. The |
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input directory contains files that should be present in the working |
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directory when you run mitgcmuv. Assuming that you compiled the |
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MITgcm executable in the build/ directory, you would run |
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``../build/mitgcmuv >& output.txt'' It is recommended that you copy the |
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contents of the directory input/ to a different directory for running |
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-- mitgcmuv does not change them, but they can be lost in the multitudes |
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of output files. |
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The data assimilation code is made by typing ``make'' in the filter |
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directory, which creates an executable named ``osse''. |
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Before running osse, the initial ensemble needs to be set up by |
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running the mkens script in verification/osse/da. mkens creates the |
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directories, symbolically links files necessary to run the model, and |
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copies in the initial ensemble files. osse should be run from the |
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directory verification/osse/da/inits since it expects the ensemble |
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members to be one directory above. It also expects to have in its |
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working directory the file iobsloc-003.txt, which contains the |
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locations of the observations. This file is located in |
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verification/osse/da/inits. |
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OSSE is a configuration to simulate running an deterministic |
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ensemble Kalman filter on a rotating tank with an ice bucket |
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at the center. |
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code/ contains the modifications to MITgcm to run in cyclindrical |
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coordinates. At the time of this writing, it requires |
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checkpoint48 to compile and run. |
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EnKF/ contains the source and data files to run the Kalman filter. |
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