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Utility program to compare the ensemble mean to a group of ensemble member restart files. The program prints out a sorted order of which members are 'closest' to the mean, where the method used to determine 'close' is selectable by namelist option. It also creates a file with a single number or character string in it, for ease in scripting, which identifies the closest member.
The ensemble mean is optionally written out from filter by setting a namelist option in the filter namelist to output the ensemble mean in restart file format at the end of a run. The difference is computed point by point across the ensemble members. There is an option to restrict the computation to just a subset of the entire state vector by listing one or more generic kinds. In this case, only state vector items matching one of these kinds will contribute to the total difference value.
Available methods are:
This program could be used to select one or more ensemble members to run a free model forecast forward in time after the assimilation is finished. Each member is an equally likely representation of the model state. Using the ensemble mean is not usually a good choice since the mean may not have self-consistent structures in the data.
In addition to printing out data about all members to both the console and to the dart log file, this program creates a single output file containing information about the closest member. If the input restart data is in a single file, the output file 'closest_restart' contains a single number which is the ensemble member number. If the input restart data is in separate files, the output file contains the full filename of the closest member, e.g. 'filter_restart.0004' if member 4 is closest. For scripting the contents of this file can be used to copy the corresponding member data and convert it to the model input format for a free forecast, for example.
Namelist interface &closest_member_tool_nml is read from file input.nml.
This namelist is read from the file input.nml. Namelists start with an ampersand '&' and terminate with a slash '/'. Character strings that contain a '/' must be enclosed in quotes to prevent them from prematurely terminating the namelist.
&closest_member_tool_nml input_restart_file_list = 'null' mean_restart_file_list = 'null' output_file_name = 'closest_restart' ens_size = 20 single_restart_file_in = .false. difference_method = 4 use_only_kinds = '' /
|input_restart_file_list||character(len=256),dimension(500)||an array of filenames each containing a list DART restart data.|
|ens_size||integer||Total number of ensemble members.|
|single_restart_file_in||logical||Whether the input filename contains a single ensemble member per file or multiple members concatinated in the same file.|
|difference_method||integer||Select which method is used to compute 'distance' from mean:
|use_only_kinds||character(len=32)||If unspecified, all items in the state vector contribute to the total difference. If one or more kinds are listed here, only items in the state vector of these kinds contribute to the total difference. These are the generic kinds, such as QTY_TEMPERATURE, QTY_U_WIND_COMPONENT, QTY_DENSITY, etc. and not specific types like RADIOSONDE_TEMPERATURE. Consult the model interface code to determine which possible kinds are returned by the get_state_meta_data() routine.|
types_mod time_manager_mod utilities_mod sort_mod assim_model_mod mpi_utilities_mod
|closest_member_tool||Invalid method number||Values 1-4 are supported|
|Contact:||DART core group|
|Revision:||$Revision: 11771 $|
|Source:||$URL: https://svn-dares-dart.cgd.ucar.edu/DART/releases/Manhattan/assimilation_code/programs/closest_member_tool/closest_member_tool.html $|
|Change Date:||$Date: 2017-06-27 10:19:58 -0600 (Tue, 27 Jun 2017) $|
|Change history:||try "svn log" or "svn diff"|