Changes between Version 2 and Version 3 of Lorenz_96_model

Timestamp:

Aug 16, 2018, 3:53:31 PM (7 years ago)

Author:

lnerger

Comment:

--

Lorenz_96_model

@@ -116 +116 @@
 
 
+== Run options ==
 
+The implementation for the Lorenz-96 model has a wide range of options. For the full set, we reommend to check the list in the file init_pdaf.F90. Essentiall all of the options can be specified on the command line in the format '-VARIABLE VALUE', where VARIABLE is the name of the variable in the program and VALUE is its value. The experiments in `runasml.sh` are executed like
+{{{
+./pdaf_lorenz_96 -total_steps 5000 -step_null 1000 -dim_ens 30 -filtertype 1 -forget 0.99 -file_asml t1_N30_f0.99.nc
+}}}
+the meaning of the different options is explained below.
+
+||= Variable =||= Description =||= Default value =||
+|| dim_ens || ensemble size || 30
+|| file_asml || the name of the output file || assimilation.nc ||
+|| filtertype || Specifies the filter to use; 1 sets the SEIK filter || 1 || 
+|| forget  || value of the forgetting factor for multiplicative variance inflation || 1.0 ||
+|| step_null || initial time step of experiment. This specifies the offset of the observations which are generated from a model forward run. A value 1000 avoids the spin-up phase of the model || none - always set it ||
+|| total_steps || number of time step in the experiment || none - always set it ||
+
+Some further options
+
+||= Variable =||= Description =||= Default value =||
+|| delt_obs  || time interval between observation, i.e. for forecast length || 1 ||
+|| dim_lag   || set the time lag for the smoother (the smoother is actiave for dim_lag>0) || 0 ||
+|| local_range || localization radius in grid points || 5 ||
+|| locweight || choose localiztion weight function, e.g. 4 is the 5th-order polynomial mimicking a Gaussian (see Gaspari and Cohn 1999) || 0 || 
+|| model_error || a logical variable activiting model error noise || .false. ||
+|| model_err_amp || amplitude of the model error || 0.1 ||
+
+
+
+
+