Variational Bias Correction of TAMDAR T

[FengGao-DA]

TYPE: new feature

KEYWORDS: aircraft data assimilation, bias correction, predictor

SOURCE: Feng Gao, gao.feng.nuist@gmail.com.

DESCRIPTION OF CHANGES:

1. Implement VarBC of TAMDAR temperature observations. It accounts for the representation of some well-known error sources contributing to uncertainties in aircraft-based temperature measurements. The bias correction is applied based upon aircraft's IDs and phases (descent/ascent/cruise).

2. To turn on this function, set "use_varbc_tamdar = true" in namelist (\wrfvar4).
   Two types of bias model are provided:
   varbc_tamdar_bm=1: two predictors are a constant of 1.0 and vertical motion rates of aircraft.
   varbc_tamdar_bm=2: five predictors are a constant of 1.0, vertical motion rates of aircraft, Mach number, temperature tendency, and temperature measured.

LIST OF MODIFIED FILES:

modified:   Registry/registry.var
modified:   var/build/da.make
modified:   var/build/depend.txt
modified:   var/da/da_control/da_control.f90
modified:   var/da/da_define_structures/da_define_structures.f90
modified:   var/da/da_main/da_solve.inc
modified:   var/da/da_main/da_wrfvar_finalize.inc
modified:   var/da/da_main/da_wrfvar_init2.inc
modified:   var/da/da_main/da_wrfvar_top.f90
modified:   var/da/da_minimisation/da_adjoint_sensitivity.inc
modified:   var/da/da_minimisation/da_calculate_gradj.inc
modified:   var/da/da_minimisation/da_calculate_j.inc
modified:   var/da/da_minimisation/da_get_innov_vector.inc
modified:   var/da/da_minimisation/da_get_var_diagnostics.inc
modified:   var/da/da_minimisation/da_kmat_mul.inc
modified:   var/da/da_minimisation/da_minimisation.f90
modified:   var/da/da_minimisation/da_minimise_cg.inc
modified:   var/da/da_minimisation/da_minimise_lz.inc
modified:   var/da/da_minimisation/da_transform_vtoy.inc
modified:   var/da/da_minimisation/da_transform_vtoy_adj.inc
modified:   var/da/da_test/da_check_gradient.inc
new file:   var/da/da_varbc_tamdar/da_varbc_tamdar.f90
new file:   var/da/da_varbc_tamdar/da_varbc_tamdar_adj.inc
new file:   var/da/da_varbc_tamdar/da_varbc_tamdar_direct.inc
new file:   var/da/da_varbc_tamdar/da_varbc_tamdar_init.inc
new file:   var/da/da_varbc_tamdar/da_varbc_tamdar_precond.inc
new file:   var/da/da_varbc_tamdar/da_varbc_tamdar_pred.inc
new file:   var/da/da_varbc_tamdar/da_varbc_tamdar_tl.inc
new file:   var/da/da_varbc_tamdar/da_varbc_tamdar_update.inc
new file:   var/run/VARBC_TAMDAR.tbl

TESTS CONDUCTED:

1. A 6-week simulation over 'CONUS' domain with and without VarBC scheme has been conducted.
2. WRFDA regression tests passed.

RELEASE NOTE: New capability for variational bias correction of TAMDAR T observations.
Gao Feng, Liu Zhiquan, Ma Juhui, A. Jacobs Neil, P. Childs Peter, & Wang, Hongli. (2019). Variational Bias Correction of TAMDAR Temperature Observations in the WRF Data Assimilation System. Monthly Weather Review. 147. 10.1175/MWR-D-18-0025.1.

[jjguerrette]

@liujake this PR has been sitting for a while. Do we have a plan for review?

[liujake]

@jjguerrette I will take care of this when having time. Not priority for now.