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This large PR adds the new capability for multi-resolution incremental 4DVar. TYPE: new feature KEYWORDS: MRI-4DVar, Inverse transform, square root of B, 3-stage SOURCE: Zhiquan (Jake) Liu, Junmei Ban, Jamie Bresch, Yali Wu, Xin Zhang, Jianyu Liu (NCAR/MMM) DESCRIPTION OF CHANGES: Existing 4DVar algorithm is run at the same model resolution for inner loop minimization of different outer loops (default namelist setting with multi_inc=0). This adds MRI-4DVar capability that can run 4DVar at lower resolution for inner loop minimization with a 3-stage procedure (observer, minimizer, regridder) as described by Liu et al. (2020) and can substantially speed up 4DVar. Three major changes include: 3-stage procedure controlled by a script and offline programs under ~var/mri4dvar; Set multi_inc=1 for the "observer" step and multi_inc=2 for the "minimizer" step. The "regridder' step is done using the offline programs. Inverse transform of square root B introduced under ~var/da/da_vtox_transforms; New namelist parameter use_inverse_squarerootb needs to be set .true. when multi_inc=2 and works together with cv_options=5, 6, or 7 and cloud_cv_options=2 or 3. New namelist parameter use_interpolate_cvt=.false. (default), which is supposed to work together with the obsolete cv_options=3, which is not recommended to use for non-expert users. Additional file I/O for control variable and radar/radiance OMB files from the observer step. This I/O part will need some further code clean-up and improvement in the future. LIST OF MODIFIED FILES: 48 files M Registry/registry.var M var/build/depend.txt M var/da/da_main/da_solve.inc M var/da/da_main/da_wrfvar_top.f90 M var/da/da_minimisation/da_get_innov_vector.inc M var/da/da_minimisation/da_minimisation.f90 M var/da/da_obs_io/da_obs_io.f90 M var/da/da_obs_io/da_read_iv_for_multi_inc.inc M var/da/da_obs_io/da_read_obs_radar.inc M var/da/da_obs_io/da_scan_obs_radar.inc M var/da/da_obs_io/da_search_obs.inc M var/da/da_obs_io/da_write_iv_for_multi_inc.inc M var/da/da_radiance/da_radiance1.f90 A var/da/da_radiance/da_read_iv_rad_for_multi_inc.inc A var/da/da_radiance/da_write_iv_rad_for_multi_inc.inc M var/da/da_recursive_filter/da_recursive_filter.f90 A var/da/da_recursive_filter/da_recursive_filter_1d_inv.inc M var/da/da_recursive_filter/da_transform_through_rf.inc A var/da/da_recursive_filter/da_transform_through_rf_inv.inc M var/da/da_setup_structures/da_setup_structures.f90 A var/da/da_setup_structures/da_write_vp.inc M var/da/da_tools/da_llxy.inc M var/da/da_vtox_transforms/da_transform_vptox.inc A var/da/da_vtox_transforms/da_transform_vptox_inv.inc A var/da/da_vtox_transforms/da_transform_vtovv_inv.inc A var/da/da_vtox_transforms/da_transform_vtox_inv.inc M var/da/da_vtox_transforms/da_transform_vvtovp.inc M var/da/da_vtox_transforms/da_transform_vvtovp_adj.inc A var/da/da_vtox_transforms/da_transform_vvtovp_inv.inc M var/da/da_vtox_transforms/da_vertical_transform.inc M var/da/da_vtox_transforms/da_vtox_transforms.f90 A var/mri4dvar/Makefile A var/mri4dvar/README.MRI-4DVar A var/mri4dvar/da_bdy.f90 A var/mri4dvar/da_bilin.f90 A var/mri4dvar/da_thin.f90 A var/mri4dvar/da_vp_bilin.f90 A var/mri4dvar/da_vp_split.f90 A var/mri4dvar/nc_increment.ncl A var/mri4dvar/nc_vpglobal.ncl A var/mri4dvar/nc_vphires.ncl A var/mri4dvar/nc_vpinput.ncl A var/mri4dvar/nc_vplocal.ncl A var/mri4dvar/rsl_lite.h A var/mri4dvar/run_mri3d4dvar.csh_lsf A var/mri4dvar/run_mri3d4dvar.csh_pbs A var/mri4dvar/task_for_point.c A var/mri4dvar/wraper_mri3d4dvar.csh TESTS CONDUCTED: WRFDA regression test passed. Cycling MRI-4DVar tests were performed over an Arctic domain. RELEASE NOTE: New capability for Multi-Resolution Incremental 4DVar (MRI-4DVar). Liu, Z., J. Ban, J.-S, Hong, and Y.-H. Kuo, 2020: Multi-resolution incremental 4D-Var for WRF: Implementation and application at convective scale, Q. J. R. Meteorol. Soc., 146, 3661-3674.
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Synchronize the develop branch from official WRF GitHub.