[Wrf-users] strange pattern in total precipitation plot (RAINC + RAINNC)

Jatin Kala jatin.kala.jk at gmail.com
Tue Feb 26 14:45:27 MST 2013


hi,
You set feedback to one, hence the inner nests feed back to the outer nest, and results in strange precip patterns where the grids intersect.
See the doc on 2-way nesting. Unless you have a good reason, feedback should be set to zero. At least that's my opinion!
cheers,
Jatin.

On 26/02/2013, at 1:18 PM, mmkamal at uwaterloo.ca wrote:

> Hi,
> 
> I run two simulation January 2002 and July 2002. I got strange pattern in the calculate total precipitation plot (RAINC + RAINNC). This pattern only appear in July simulation. I have checked the model run two times and could not find any problem. I look forward to hearing from you.
> 
> 
> Thanks
> Kamal
> 
> 
> 
> ===================================
> Here is my namelist.input file
> ===================================
> 
>  &time_control
> run_days                            = 32,
> run_hours                           = 0,
> run_minutes                         = 0,
> run_seconds                         = 0,
> start_year                          = 2002, 2002, 2002,
> start_month                         = 07,   07,   07,
> start_day                           = 01,   01,   01,
> start_hour                          = 00,   00,   00,
> start_minute                        = 00,   00,   00,
> start_second                        = 00,   00,   00,
> end_year                            = 2002, 2002, 2002,
> end_month                           = 08,   08,   08,
> end_day                             = 01,   01,   01,
> end_hour                            = 00,   00,   00,
> end_minute                          = 00,   00,   00,
> end_second                          = 00,   00,   00,
> interval_seconds                    = 10800
> input_from_file                     = .true.,.true.,.true.,
> history_interval                    = 180,  180,   180,
> frames_per_outfile                  = 1000, 1000,  1000,
> restart                             = .false.,
> restart_interval                    = 28800,
> io_form_history                     = 2
> io_form_restart                     = 102
> io_form_input                       = 2
> io_form_boundary                    = 2
> auxinput4_inname                    = "wrflowinp_d<domain>"
> auxinput4_interval                  = 180, 180, 180,
> io_form_auxinput4                   = 2,
> debug_level                         = 0
> /
> 
> &domains
> time_step                           = 48,
> time_step_fract_num                 = 0,
> time_step_fract_den                 = 1,
> max_dom                             = 3,
> e_we                                = 225,   214,   244,
> e_sn                                = 175,   211,   271,
> e_vert                              = 28,    28,    28,
> p_top_requested                     = 10000,
> num_metgrid_levels                  = 30,
> num_metgrid_soil_levels             = 4,
> dx                                  = 8000, 2666.666,  888.888,
> dy                                  = 8000, 2666.666,  888.888,
> grid_id                             = 1,     2,     3,
> parent_id                           = 1,     1,     2,
> i_parent_start                      = 1,     68,    70,
> j_parent_start                      = 1,     65,    50,
> parent_grid_ratio                   = 1,     3,     3,
> parent_time_step_ratio              = 1,     3,     3,
> feedback                            = 1,
> smooth_option                       = 0
> /
> 
> &physics
> mp_physics                          = 6,     6,     6,
> ra_lw_physics                       = 1,     1,     1,
> ra_sw_physics                       = 1,     1,     1,
> radt                                = 8,     8,     8,
> sf_sfclay_physics                   = 1,     1,     1,
> sf_surface_physics                  = 2,     2,     2,
> bl_pbl_physics                      = 1,     1,     1,
> bldt                                = 0,     0,     0,
> cu_physics                          = 1,     0,     0,
> cudt                                = 5,     5,     5,
> isfflx                              = 1,
> ifsnow                              = 0,
> icloud                              = 1,
> surface_input_source                = 1,
> num_soil_layers                     = 4,
> sf_urban_physics                    = 0,     0,     0,
> sst_update                          = 1,
> num_land_cat                        = 28
> /
> 
> &dynamics
> rk_ord                              = 3,
> diff_opt                            = 1,
> km_opt                              = 4,
> diff_6th_opt                        = 2,      2,      2,
> diff_6th_factor                     = 0.06,   0.06,   0.06,
> damp_opt                            = 1,
> zdamp                               = 8000.,  8000.,  8000.,
> dampcoef                            = 0.03,    0.03,  0.03,
> w_damping                           = 1,
> base_pres                           = 100000.,
> base_temp                           = 290.
> base_lapse                          = 50.,
> iso_temp                            = 0.,
> smdiv                               = 0.1,    0.1,    0.1,
> emdiv                               = 0.01,   0.01,   0.01
> epssm                               = 0.1,    0.1,    0.1
> non_hydrostatic                     = .true., .true., .true.,
> h_mom_adv_order                     = 5,      5,      5,
> v_mom_adv_order                     = 3,      3,      3,
> h_sca_adv_order                     = 5,      5,      5,
> v_sca_adv_order                     = 3,      3,      3,
> time_step_sound                     = 4,      4,      4,
> moist_adv_opt                       = 1,      1,      1,
> scalar_adv_opt                      = 1,      1,      1,
> tke_adv_opt                         = 1,      1,      1,
> khdif                               = 0,      0,      0,
> kvdif                               = 0,      0,      0,
> 
> /
> 
> &bdy_control
> spec_bdy_width                      = 5,
> spec_zone                           = 1,
> relax_zone                          = 4,
> specified                           = .true., .false.,.false.,
> spec_exp                            = 0.33,
> nested                              = .false., .true., .true.,
> /
> 
> &grib2
> /
> 
> &namelist_quilt
> nio_tasks_per_group = 0,
> nio_groups = 1,
> /
> 
> 
> 
> 
> 
> <DAY_minus_WRF_Prcp.000003.png><DAY_minus_WRF_Prcp.000003.png>_______________________________________________
> Wrf-users mailing list
> Wrf-users at ucar.edu
> http://mailman.ucar.edu/mailman/listinfo/wrf-users

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