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wrf physics

  1. S

    How do I understand Registry files?

    Hello, I am running WRFv4.4.2 and studying the registry to create only the variables I need in the output. There are numerous files in the ~/WRF/Registry directory, and from what I understand, the files used are different depending on the compilation options (em_real, or ideal, etc.), and there...
  2. I

    WRF-4.4.2 crashes after enabling sf_urban_physics

    Dear community. I trying to run a WRF simulation with sf_urban_physics enabled. However the model crashes around end of June for two different years (2021 and 2022): forrtl: severe (408): fort: (3): Subscript #1 of the array KA_MN2O has value -2147483647 which is less than the lower bound of 1...
  3. D

    Ocean Currents (UOCE/VOCE) in MYNN PBL

    I am currently using the version 4.1.2 and trying to use time-varing ocean currents imported from the coupled ocean model. Also, the time-varying sea ice information has been imported from the coupled sea-ice model. After examining the code, the surface currents are removed from the lowest...
  4. L

    cglc-modis-lcz_100m dataset " WARNING, THE URBAN FRACTION WILL BE READ FROM URBPARM.TBL USING DEFAULT URBAN MORPHOLOGY"

    Dear WRF experts! I am stuck running WRF urban using the cglc-modis-lcz_100m dataset for Germany using three one-way nested domains at 12, 3, and 1 km, respectively. I'm considering the sf_urban_physics = 2 and the hybrid 100-m global land cover dataset with Local Climate Zones. To use this...
  5. P

    High resolution (gray-zone adjacent) simulations and gravity wave drag options

    Hello all, I am currently running WRF simulations with the goal of resolving rather short wavelength (high-frequency) wave motions in the lee of a mountain range (wavelength of several km and period of 1-10 min); in the past these motions were attributed to KH instability between the...
  6. S

    Turn off Surface Sensible Heating (HFX) from the WRF Simulation

    Dear WRF Community, I am trying to run a case by turning off Surface Sensible Heating (HFX) from the simulation. I use the Revised MM5 for the surface layer physics (option 1 in namelist.input). I got some ideas from this previous thread. I modify module_sf_sfclay.F file I changed the line...
  7. george_victor

    Surface roughness estimation over ocean grid points

    Hi! I was making an LES simulation over ocean and seaice grids. While analyzing the outputs, I found that the sea surface roughness length (ZNT) is in correlation with the wind speed (checked for various heights up to 50m from the surface). Although the correlation is not precisely 1, I was...
  8. H

    There was a problem when I used afwa_icing_opt in AFWA for WRF4.5

    Hello, I am using the AFWA module in WRF4.5(Thompson MP(8))to simulate icing. When I modified the registry. afwa and open afwa_icing_opt, the corresponding variable output all 0 in WRFOUT(ICING_SM and ICING_LG). When I turn on AFWA, I get the Radar variable. And in...
  9. M

    Noahlsm

    Hello experts, I ran two simulations with sf_urban_physics = 0 and sf_urban_physics = 1 (SLUCM), I coupled both with Noah LSM, Please I will like to know how Noah calculates the skin surface temperature for both. I took a look at the module_sf_noahlsm.F code but i do not have clarity on it, I...
  10. S

    WRF model crashed with SBM fast Microphysics with Tiedtke Cumulus physics Scheme

    Hi Admin, I am trying to run the model with SBM fast microphysics and the Tiedtke Cumulus physics Scheme I encountered the model crash. I tried changing and reducing the time_step but that doesn't seem to work in this case. I am attaching my new namelist file and the latest rsl error files...
  11. S

    WRF CHEM 4.4.2 -- Simulation stops when using Single Layer Urban Canopy Model (forrtl: severe: SIGSEGV, segmentation fault occurred)

    Dear community, I have been trying to run WRF CHEM simulation using the single layer UCM (sf_urban_physics = 1), like the title says. However, no matter what I try the simulation stops after some period of time. I have conducted successful simulations using no urban (sf_urban_physics = 0) or...
  12. G

    Missing FRC_URB2D values over Cyprus using cglc-modis-lcz_100m dataset

    Dear WRF Expert, I'm running the model over Cyprus using three one-way nested domains at 12, 3, and 1 km, respectively. I'm considering the sf_urban_physics = 2 and the hybrid 100-m global land cover dataset with Local Climate Zones. To use this dataset, I followed the instructions provided...
  13. W

    NOAHMP questions

    I have a few questions about NOAHMP 1. Do you have to change the geogrid file link from geogrid.arw to geogrid.arw.noahmp to use noahmp? 2. Which optional or supplementary files are needed to use noahmp for geography 3. If you don't call the noahmp geogrid file and you put the noahmp commands...
  14. M

    Pass a variable to microphysical scheme

    Hello, This question has been asked here. Hope to get help! the variable tracer(I,k,j,P_tr17_2) has been calculated in solve_em.F and designed to be passed to module_mp_full.F Following is what I did: the calculated tracer(I,k,j, P_tr17_2) is firstly in the CALL microphysics_driver...
  15. C

    how to integrate soil moisture layers in Noah-MP module

    Dear all, I am confused about how to calculate the total soil moisture when considering multiple layers. The stimulated soil moisture has four layers (i.e., 0-10cm; 10-40cm; 40-100cm; 100-200cm) in Noah-MP module. But if we want to get the soil moisture in the layer 0-40cm and 40-200cm, can we...
  16. J

    Nested Hurricane Namelist Physics Options

    Hi, I am relatively new to WRF but I am trying to run a (3) nested (Atlantic) hurricane case but I am wondering what namelist options are best recommended for the nested domains. For the parent domain i used the following options: mp_physics = 6, ra_sw_physics = 4, ra_lw_physics = 4, radt = 10...
  17. N

    Outputs are different with and without tracer option in WRF-WVT

    I am using WRF 4.3.3 with water vapor tracer tool from this link. I chose the tracer_opt as zero in the namelist.input to test whether the outputs are same with and without tracer. I am verifying this with ncdiff and the outputs are different. Can someone help with the namelist.input parameters...
  18. M

    WRF LES for methane simulation

    Hi. I am a PhD Student doing research on methane plumes detection using satellite imagery. I want to run a methane simulation on WRF LES. Can anyone help me on this? A step by step guide or a tutorial link would be very helpful. Thank You
  19. I

    Physics (about wsm-6)

    Hello, I have a question about the physics in wrf 4.5 , i noticed that exist an accelarted version of some physics like wsm-3 and wsm-5 but wsm-6 not, why wsm-6 haven't an accelarate version ?
  20. P

    Spurious waves seemingly emerging from domain boundaries - running WRF with 333 m resolution over complex terrain

    Hello WRF community, I am new to WRF and this forum, but I believe (after some searching) that this particular question was not asked. I wish to simulate KH waves (scale of several kilometers) over some fairly complex terrain; I wish to run the model at 333 m resolution which necessitates 4...
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