<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Dear WRF users<br><br>I want to run WRF for my special domain for air quality modeling using 3 nesting domains, 9, 3 and 1 km.<br>Can anyone help me how to choose the best physic options for my domains?<br><br>Thanks in advance<br>Hossein<br><br>Here in the namelist i use:<br><br> &time_control<br> run_days = 11,<br> run_hours = 0,<br> run_minutes =
0,<br> run_seconds = 0,<br> start_year = 2012, 2012, 2012,<br> start_month = 07, 07, 07,<br> start_day = 05, 05, 05,<br> start_hour = 00,
00, 00,<br> start_minute = 00, 00, 00,<br> start_second = 00, 00, 00,<br> end_year = 2012, 2012, 2012,<br> end_month = 07, 07,
07,<br> end_day = 15, 15, 15,<br> end_hour = 00, 00, 00,<br> end_minute = 00, 00, 00,<br> end_second = 00, 00,
00,<br> interval_seconds = 21600<br> input_from_file = .true.,.true.,.true.,<br> history_interval = 60, 60, 60,<br> frames_per_outfile = 1000, 1000, 1000,<br> restart =
.false.,<br> restart_interval = 5000,<br> io_form_history = 2<br> io_form_restart = 2<br> io_form_input = 2<br> io_form_boundary = 2<br> debug_level =
0<br> /<br><br> &domains<br> time_step = 40,<br> time_step_fract_num = 0,<br> time_step_fract_den = 1,<br> max_dom = 3,<br> e_we = 179, 145, 91,
<br> e_sn = 173, 130, 82, <br> e_vert = 28, 28, 28, <br> p_top_requested = 5000,<br> num_metgrid_levels = 27,<br> num_metgrid_soil_levels =
4,<br> dx = 9000, 3000, 1000,<br> dy = 9000, 3000, 1000,<br> grid_id = 1, 2, 3, <br> parent_id = 0,
1, 2, <br> i_parent_start = 1, 66, 59, <br> j_parent_start = 1, 65, 51, <br> parent_grid_ratio = 1, 3, 3, <br> parent_time_step_ratio = 1, 3, 3,
<br> feedback = 1,<br> smooth_option = 0<br> /<br><br> &physics<br> mp_physics = 10, 10, 10, <br> ra_lw_physics = 1, 1, 1,
<br> ra_sw_physics = 2, 2, 2, <br> radt = 30, 30, 30, <br> sf_sfclay_physics = 2, 2, 2, <br> sf_surface_physics = 2, 2, 2,
<br> bl_pbl_physics = 2, 2, 2, <br> bldt = 0, 0, 0, <br> cu_physics = 1, 1, 0, <br> cudt =
5, 0, 0, <br> isfflx = 1,<br> ifsnow = 1,<br> icloud = 1,<br> surface_input_source = 1,<br> num_soil_layers =
4,<br> sf_urban_physics = 1, 1, 1, <br> /<br><br> &fdda<br> /<br><br> &dynamics<br> w_damping = 0,<br> diff_opt = 1,<br> km_opt =
4,<br> diff_6th_opt = 0, 0, 0, <br> diff_6th_factor = 0.12, 0.12, 0.12, <br> base_temp = 290.<br> damp_opt =
0,<br> zdamp = 5000., 5000., 5000., <br> dampcoef = 0.2, 0.2, 0.2, <br> khdif = 0, 0, 0,
<br> kvdif = 0, 0, 0, <br> non_hydrostatic = .true., .true., .true., <br> moist_adv_opt = 1, 1, 1, <br> scalar_adv_opt = 1, 1,
1, <br> /<br><br> &bdy_control<br> spec_bdy_width = 5,<br> spec_zone = 1,<br> relax_zone = 4,<br> specified = .true.,
.false.,.false.,<br> nested = .false., .true., .true., <br> /<br><br> &grib2<br> /<br><br> &namelist_quilt<br> nio_tasks_per_group = 0,<br> nio_groups = 1,<br> /<br><br></td></tr></table>