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wrf physics

  1. A

    WRF Crashes with Shinhong PBL scheme

    Hi all, I am attempting a simulation with WRFV4.4 with the Shinhong PBL Scheme (11), however, I keep getting some errors relating to the surface physics. The current setup is tried with both Noah and NoahMP land surface models, but the model keeps crashing after a few hours into the...
  2. george_victor

    Modifying Seaice roughness length

    Hi! I'm planning a sensitivity test. I've already made a control simulation, now I need to make a simulation with modified roughness length. I understand that usually the roughness length for seaice is set a constant, and it is straight forward to modify it into a new constant value. However, in...
  3. T

    High Resolution (dx/dy ~200m) Simulations and PBL Schemes

    Hi all, I recently computed a four domain (25km, 5km, 1km, 200m) simulation and received realistic output. However, after looking through the guidelines I came across the following: "PBL schemes can be used for most grid sizes when surface fluxes are present; however, at grid size dx << 1 km...
  4. S

    Deng Shallow cumulus scheme WRF v4.4

    I want to run the model using the shallow cumulus scheme = 5. From the user manual, it says this one will work with MYNN and MYJ PBL. So I tried both schemes, but I kept getting errors Here I show what I get when I use the MYJ. It confuses me because the icloud_bl is supposed to be for the MYNN...
  5. C

    UCM model Issue

    I tried to run SL-UCM model by putting sf_urban physics value as 0,0,0,1 in a 4 domain model. The model ran successfully, but whe I ran the same model with urban physics as 0,0,0,0; and removing the use_wudapt lcz from the model, the result came out to be same as previous. Kindly, tell the...
  6. J

    Milbrandt & Yau Multimoment Scheme Rainfall Gamma Distribution

    Hi, I wanted to ask anyone who has experience using the Milbrandt & Yau Multimoment Scheme. I'm looking at rain. I'm wondering what are realistic values for lambda and N_0 and what order of magnitude should I expect? I have input values of: N_T=200000kg-1 q=0.001kgkg-1 I'm trying to do a...
  7. Y

    Question about aerosol-aware thompson scheme

    Hello all, I am currently using the aerosol-aware thompson scheme to do some simulation work. But I have some doubts. I want to compare the effect of aerosols on meteorological elements (such as precipitation and temperature, etc.), so I need to carry out two experiments, one with aerosols...
  8. J


    Hello, I'm running WRF 4.4.1 and want to activate sf_urban_physics options. I have read about CGLC-MODIS-LCZ dataset with 100m resolution and 60 land use categories. I have successfully run WPS and real.exe, but when running wrf.exe I find the following error: I activated wudapt option in the...
  9. K

    unrealistic values of temperature after ./real.exe

    Hello, I was running the the ./real.exe after the metgrid program and was surprised to see the unrealistic range of values in the temperature, Can any one please help me with this, my output files and input are by the name , " files_kgeo.tar " in the upload. i have tried many things to fix...
  10. X

    Calculation about h_diabatic in subroutine moist_physics_finish_em

    Dear Sir or Madam, I looked in the code of subroutine moist_physics_finish_em in module_big_step_utilities_em.F file. According to the code, moist theta is updated by summation of the following terms: pre-microphysics moist theta, theta tendency times (1+1.61*post-microphysics Qv) and 1.61...
  11. S

    namelist.input configuration for coastal regions @ 3km resolution

    We are using GFS/GDAS at 0.25 degree resolution as primary input for WRF simulations in forecast mode for the next 3-4 days. While the regional simulations at 20 and 25 km resolutions are looking good, the precipitation patterns for coastal regions when downscaled to 3km are consistently...
  12. O

    SAG and SAV equals to Zero in VEGE_FLUX and BARE_FLUX subroutines within MODULE_SF_NOAHMPLSM?

    Good day colleagues, Out of curiosity, I have been trying to print out the values of SAG (Solar radiation absorbed by ground) and SAV (Solar radiation absorbed by vegetation) in the VEGE_FLUX and BARE_FLUX subroutines within the MODULE_SF_NOAHMPLSM using WRITE (6, *) 'SAV=', SAV, 'SAG=', SAG ...
  13. W

    [SOLVED] Segfault for WRF V4.5 with the new hybrid 100-m MODIS-LCZ dataset using SLUCM urban physics

    Hi, I came across segfault for WRF 4.5 using the new modis-lcz dataset under SLUCM urban physics. The segfault always happen at 1 of the 72 cores in Cheyenne. From the error log it seems that the segfault happens during avgflx at solve_em.F. I cannot pinpoint how it happens without any...
  14. T

    Hydrometeor conversion rates

    Hello, I want to analyse contributions to hail tendency (in the MY microphysical scheme) of conversion rates of cloud, rain, ice ect., but I'm not successful with WRF-wrfout. Can anyone help?
  15. P

    Unusual tiling in precipitation field while using WRF aerosol-aware microphysics scheme

    I am seeing unusual tiling in the precipitation field simulated by WRF aerosol microphysics scheme of Song and Zhang, 2011, i.e., mp_physics = 40, which is used together with cu_physics = 11. I have 3 domains in my simulations and tiling is happening in all three domains. I am using WRF V4.4...
  16. D

    CLDFRA results

    Dear WRF community, I have extracted 3D cloud fraction (CLDFRA) from my WRF output files. However, I got weird values, like 0.00239 for some hours. can I use the obtained values or I should transform them? Thank you
  17. Z

    Can we use urban 3D data in WRF

    Hi, everyone. Recently I have a question. That is, if I have a gridded dataset of urban building height. How can I use it when I run a WRF simulation? As I know, we re allowed to replace the land use and land cover (LULC) data. Is there a similar way to deal with urban 3D data? Now only...
  18. J

    Wrong TAOD5502D after using climatological aerosol in mp_physics=28 in WRF V4.4

    Hi all, I am trying to run the aerosol-aware version with mp_physics = 28 option under WRF V4.4. Following all the instructions, the metgrid.exe ran well after adding the following line: &metgrid constants_name = 'QNWFA_QNIFA_QNBCA_SIGMA_MONTHLY.dat' The B_WIF_*、 I_WIF_* 、 W_WIF_* have been...
  19. A

    emitted longwave <0; skin T may be wrong due to inconsistent input of SHDFAC with LAI

    Hello everyone, I'm having difficulties running WRF V4.3 with ERA5 data and BEP-BEM urban parameterization. My goal is to simulate the whole 2022, and before that I'm testing running the first 10 days of January. However, at day 4 and 04h the simulation stops with the following error: d01...
  20. Y

    (RESOLVED) Segmentaition fault when running wrf.exe

    Hello all, I'm running WRFV4.5 with sf_urban_physics=1 (i.e., SLUCM), unfortunately, the model stopped after integrating several hours. The error information which I got is as follows: [ib0414:86410:0:86410] Caught signal 11 (Segmentation fault: address not mapped to object at address...