[Wrf-users] domain 2 visible in domain 1

G. Hesselmans hesselmans at hermess.nl
Fri Oct 28 07:56:09 MDT 2016


WRF-users

I have a case where coordinates of domain 1 seem to be influenced by 
domain 2.

The attached figure (grid1.png) shows the xlong and xlat coordinates of 
domain 1.

In the lower right a rectangular area is visible where the grid points 
are slightly shifted.

A figure of domain 2 (grid2.png) is added to demonstrate that this 
rectangle in domain 1 indeed coincides with domain 2.

In a third figure (intersection.png) I have plotted the longitude values 
along a certain row. Longitude values clearly show discontinuities.

Please find attached the namelist.input and namelist.wps files used for 
the run.

Hope someone can explain this strange behavior.

Kind regards, Gerard

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 &time_control
 run_days                            = 1,
 run_hours                           = 0,
 run_minutes                         = 0,
 run_seconds                         = 0,
 start_year                          = 2016, 2016, 2016, 2016, 2016, 2016,
 start_month                         = 06, 06, 06, 06, 06, 06,
 start_day                           = 01, 01, 01, 01, 01, 01,
 start_hour                          = 00, 00, 00, 00, 00, 00,
 start_minute                        = 00, 00, 00, 00, 00, 00,
 start_second                        = 00, 00, 00, 00, 00, 00,
 end_year                            = 2016, 2016, 2016, 2016, 2016, 2016,
 end_month                           = 06, 06, 06, 06, 06, 06,
 end_day                             = 02, 02, 02, 02, 02, 02,
 end_hour                            = 00, 00, 00, 00, 00, 00,
 end_minute                          = 00, 00, 00, 00, 00, 00,
 end_second                          = 00, 00, 00, 00, 00, 00,
 interval_seconds                    = 21600,
 input_from_file                     = .true., .true., .true., .true., .true., .true.,
 history_interval                    = 180, 60, 30, 30, 30, 30,
 frames_per_outfile                  = 1000, 1000, 1000, 1000, 1000, 1000,
 restart                             = .false.,
 restart_interval                    = 360,
 io_form_history                     = 2,
 io_form_restart                     = 2,
 io_form_input                       = 2,
 io_form_boundary                    = 2,
 debug_level                         = 0,
 /

 &domains
 time_step                           = 120,
 time_step_fract_num                 = 0,
 time_step_fract_den                 = 1,
 max_dom                             = 2,
 e_vert                              = 37, 37, 37, 37, 37, 37,
 p_top_requested                     = 5000,
 num_metgrid_levels                  = 32,
 num_metgrid_soil_levels             = 4,
 eta_levels                          = 1.0, 0.99873, 0.99746, 0.994284, 0.990345750137, 0.987785532097, 0.986664, 0.984593656877, 0.977773, 0.974442052067, 0.965071, 0.954086, 0.934239, 0.90951, 0.88097, 0.83387, 0.78715, 0.74078, 0.69459, 0.61511, 0.54363, 0.47893, 0.42032, 0.36754, 0.32022, 0.27787, 0.23886, 0.20220, 0.16779, 0.13622, 0.10845, 0.08413, 0.06279, 0.04402, 0.02747, 0.01288, 0.0,
 dx                                  = 25000, 5000, 1000, 200, 
 dy                                  = 25000, 5000, 1000, 200,
 grid_id                             = 1, 2, 3, 4, 5, 6,
 parent_id                           = 0, 1, 2, 3, 4, 5,
 i_parent_start                      = 1, 50, 51, 15,
 j_parent_start                      = 1, 7, 27, 44,
 e_we                                = 76,  96, 81,  61, 
 e_sn                                = 56, 106, 81,  61,
 parent_grid_ratio                   = 1, 5, 5, 5, 5, 5,
 parent_time_step_ratio              = 1, 5, 5, 5, 5, 5,
 feedback                            = 1,
 smooth_option                       = 0,
 use_adaptive_time_step              = .true.,
 step_to_output_time                 = .true.,
 target_cfl                          = 0.8, 0.8, 0.8, 0.8, 0.8, 0.8,
 max_step_increase_pct               = 5, 51, 51, 51, 51, 51,
 starting_time_step                  = 125, 25, 5, 2,
 min_time_step                       = -1, -1, -1, -1,
 max_time_step                       = 250, 50, 10, 2,
/

 &physics
 mp_physics                          = 3, 3, 3, 3, 3, 3,
 ra_lw_physics                       = 4, 4, 4, 4, 4, 4,
 ra_sw_physics                       = 4, 4, 4, 4, 4, 4,
 radt                                = 30, 30, 30, 30,30, 30,
 sf_sfclay_physics                   = 5, 5, 5, 5, 5, 5,
 sf_surface_physics                  = 2, 2, 2, 2, 2, 2,
 bl_pbl_physics                      = 5, 5, 5, 5, 5, 5,
 bl_mynn_tkeadvect                   = .true., .true., .true., .true., .true., .true.,
 bldt                                = 0, 0, 0, 0, 0, 0,
 cu_physics                          = 1, 0, 0, 0, 0, 0,
 cudt                                = 5, 5, 5, 5, 5, 5,
 isfflx                              = 1,
 ifsnow                              = 0,
 icloud                              = 1,
 surface_input_source                = 1,
 num_soil_layers                     = 4,
 sf_urban_physics                    = 0, 0, 0, 0, 0, 0,
 maxiens                             = 1,
 maxens                              = 3,
 maxens2                             = 3,
 maxens3                             = 16,
 ensdim                              = 144,
 windfarm_opt                        = 0, 0, 0, 0, 0, 0,
 /

 &fdda
 /

 &dynamics
 w_damping                           = 0,
 diff_opt                            = 1, 1, 1, 1, 1, 1,
 km_opt                              = 4, 4, 4, 4, 4, 4,
 diff_6th_opt                        = 0, 0, 0, 0, 0, 0,
 diff_6th_factor                     = 0.12, 0.12, 0.12, 0.12, 0.12, 0.12,
 base_temp                           = 290.,
 damp_opt                            = 3,
 zdamp                               = 5000., 5000., 5000., 5000., 5000., 5000.,
 dampcoef                            = 0.2, 0.2, 0.2, 0.2, 0.2, 0.2,
 khdif                               = 0, 0, 0, 0, 0, 0,
 kvdif                               = 0, 0, 0, 0, 0, 0,
 non_hydrostatic                     = .true., .true., .true., .true., .true., .true.,
 moist_adv_opt                       = 1, 1, 1, 1, 1, 1,
 scalar_adv_opt                      = 1, 1, 1, 1, 1, 1,
 epssm                               = 0.1, 0.1, 0.1, 0.1, 0.1, 0.1,
/

 &bdy_control
 spec_bdy_width                      = 5,
 spec_zone                           = 1,
 relax_zone                          = 4,
 specified                           = .true., .false., .false., .false., .false., .false.,
 nested                              = .false., .true., .true., .true., .true., .true.,
 /

 &grib2
 /

 &namelist_quilt
 nio_tasks_per_group = 0,
 nio_groups = 1,
 /
 
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&share
 wrf_core = 'ARW',
 max_dom = 2,
 start_date = '2016-06-01_00:00:00', '2016-06-01_00:00:00', '2016-06-01_00:00:00', '2016-06-01_00:00:00', '2016-06-01_00:00:00', '2016-06-01_00:00:00',
 end_date   = '2016-06-02_00:00:00', '2016-06-01_00:00:00', '2016-06-01_00:00:00', '2016-06-01_00:00:00', '2016-06-01_00:00:00', '2016-06-01_00:00:00',
 interval_seconds = 21600,
 io_form_geogrid = 2,
/

&geogrid
 parent_id         = 0, 1, 2, 3, 4, 5,
 parent_grid_ratio = 1, 5, 5, 5,
 i_parent_start    = 1, 50, 51, 15,
 j_parent_start    = 1, 7, 27, 44,
 e_we              = 76,  96, 81, 61, 
 e_sn              = 56, 106, 81, 61,
 geog_data_res     = '10m','2m','30s','30s', '30s',
 dx = 25000,
 dy = 25000,
 map_proj = 'lambert',
 ref_lat   = 56.0,
 ref_lon   = -4.0,
 truelat1  = 49.0,
 truelat2  = 55.0,
 stand_lon = 4.0,
 geog_data_path = '/mnt/data/wrf/work/wrfhelp/WPS_GEOG/geog/',
 opt_geogrid_tbl_path = '/usr/local/WPSV3.6.1/geogrid/',
/

&ungrib
 out_format = 'WPS',
 prefix = 'GFS',
/

&metgrid
 fg_name = 'GFS',
 io_form_metgrid = 2, 
 opt_metgrid_tbl_path = '/usr/local/WPSV3.6.1/metgrid/',
/


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