Testing get_close caching fix

This page describes a collection of ten three-member CAM-FV runs intended to test:

1. The effect of the get_close_caching fix in filter_assim in DART pull request #364, and

2. The effect of the exact second order perturbation sampling ENKF filter (ESKF) in assimilation_code/modules/assimilation/assim_tools_mod.f90.

mkmf.template

The mkmf.template is set for the:

1. Cray wrappers for Intel fortran in both serial and parallel using ftn

2. Serial netcdf

3. No optimization

4. Intel oneAPI Math Kernel Library (oneMKL) using qmkl

MPIFC = ftn
MPILD = ftn
FC = ftn
LD = ftn

INCS = -I/opt/cray/pe/netcdf/4.7.4.4/INTEL/19.1/include
LIBS = -L/opt/cray/pe/netcdf/4.7.4.4/INTEL/19.1/lib -lnetcdff -lnetcdf

FFLAGS  = -O0 -qmkl $(INCS)
LDFLAGS = $(FFLAGS) $(LIBS)

Possible configurations

There are two DART versions:

1. the 2020 version, DART 9.X.X

2. the 2022 version, DART 10.5.3

and two statuses of each version:

1. the original status in which assim_tools_mod.f90 is unchanged, and

2. the modified status in which assim_tools_mod.f90 has been modified to include the ESKF filter.

Thus there are 10 possible configurations of these two statuses, two versions and three filters:

	DART	DART-esops	DART_10.5.3	DART_10.5.3-esops
EAKF	2020_original_EAKF	2020_modified_EAKF	2022_original_EAKF	2022_modified_EAKF
ENKF	2020_original_ENKF	2020_modified_ENKF	2022_original_ENKF	2022_original_ENKF
ESKF		2020_modified_ESKF		2022_modified_ESKF

It is only possible to build the ESKF filter with the two modified repositories.

input.nml settings

Filter	filter_kind	sort_obs_inc
EAKF	1	.false.
ENKF	2	.true.
ESKF	9	.true.

Differences

There are 13 sensible differences to check between the various repositories:

• Six possible differences between the EAKF experiments

• Six possible differences between the ENKF experiments

• 1 possible difference between the ESKF experiments

EAKF experiments

All of the EAKF experiments reproduce.

2020_original_EAKF-2020_modified_EAKF

2020_original_EAKF-2022_original_EAKF

2020_original_EAKF-2022_modified_EAKF

2020_modified_EAKF-2022_original_EAKF

2020_modified_EAKF-2022_modified_EAKF

2022_original_EAKF-2022_modified_EAKF

ENKF experiments

Only two of the ENKF comparisons reproduce:

• the 2020 filters, both original and modified

• the 2022 filters, both original and modified

2020_original_ENKF-2020_modified_ENKF

2020_original_ENKF-2022_original_ENKF

2020_original_ENKF-2022_modified_ENKF

2020_modified_ENKF-2022_original_ENKF

2020_modified_ENKF-2022_modified_ENKF

2022_original_ENKF-2022_modified_ENKF

ESKF experiments

The ESKF experiments do not reproduce.

2020_modified_ESKF-2022_modified_ESKF