Changes between Initial Version and Version 1 of U_init_obsvar_l

Timestamp:

Jan 21, 2016, 3:50:30 PM (8 years ago)

Author:

lnerger

Comment:

--

U_init_obsvar_l

@@ +1 @@
+= U_init_obsvar_l =
+
+The page documents the user-supplied call-back routine `U_init_obsvar_l`.
+
+The routine `U_init_obsvar_l` is a call-back routine that has to be provided by the user.  In the simplified interface the predefined name of the routine is `init_obsvar_l_pdaf`, but in the full interface, the user can choose the name of the routine.
+The routine is called in the local filters during the loop over all local analysis domains by the routine that computes a local adaptive forgetting factor (`PDAF_set_forget_l`). The routine has to initialize a local mean observation error variance for all observations used for the analysis in the specified local analysis domain. 
+The routine is only called if the local adaptive forgetting factor is used (`type_forget=2` in the example implementation). When the routine is called it has to return the mean observation error variance for the local observation domain.
+
+The interface is the following:
+{{{
+SUBROUTINE init_obsvar_l(domain_p, step, dim_obs_l, obs_l, meanvar_l)
+}}}
+with
+ * `domain_p` : `integer, intent(in)`[[BR]] Index of current local analysis domain
+ * `step` : `integer, intent(in)`[[BR]] Current time step
+ * `dim_obs_l` : `integer, intent(in)`[[BR]] Local dimension of observation vector
+ * `obs_l` : `real, intent(in), dimension(dim_obs_p)`[[BR]] Local observation vector
+ * `meanvar_l` : `real, intent(out)`[[BR]] Mean local observation error variance
+
+Notes:
+ * If the local adaptive forgetting factor is not used, this routine has only to exist for the compilation, but it does not need functionality.