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wrf physics

  1. H

    Drifting temperature 2m

    Dear all I am running WRF4.3.2 (and also WRF4.4) using WUDAPT's local climate zones (LCZ) and detailed land use classification generated using W2W application. I am modeling a large metro area evaluating model performance for wind speed and temperature near surface (U10, V10, T2 variables). I...
  2. G

    Crash in surface energy budget

    Hi guys, I have a question on surface layer parameter. When temperature get higher (around 30°C) then the model stops because of crash in surface energy budget. We already tried to solve the problem with the timestep but the problem still occurs. We are currently using surface-layer option =...
  3. N

    Tables in WRF/test/em_real

    I am trying to understand how the tables in WRF are used (The tables located in em_real, such as LANDUSE.TBL and URBPARM.TBL). Under what circumstances does WRF use these tables (what settings need to be turned on)? Where in the flow of WRF are the tables used? Is there documentation for the use...
  4. C

    Modelling over complex terrain at high altitude

    I want to set up a model over a complex terrain at high altitude (between 3000m and 5000m). The main problem here is that sometimes the surface wind field is forced by the model to make a wind direction daily cycle, instead of one steady direction (mainly from the north). So, I most of the time...
  5. C

    questions about module_first_rk_step_part1.F

    Dear WRF community, Thanks for your attention! 1) I am confused about the QV=moist(ims,kms,jms,P_QV) in the CALL radiation_driver in module_first_rk_step_part1.F . moist(ims,kms,jms,P_QV) is one number, while QV in module_radiation_driver.F is an array with DIMENSION( ims:ime, kms:kme...
  6. B

    ACM2 scheme error

    I use pxlsm and can successfully run the ACM2 scheme with three levels of nesting (36.12.04km). But when I run 12km and 04km separately, I got this error (The input and bdy from nesting) . 36km can run successfully. Model crashed immediately FATAL CALLED FROM FILE: <stdin> LINE: 415...
  7. W

    Error in TWOSTREAM subroutine (module_sf_noahmplsm.F)

    Hi everyone, I am running WRF4.2.2 at urban scale (1km) after having successfully completed the simulations for the parent domains D01 and D02 (15km and 5km). Unfortunately, in one of my urban domain I get a segmentation fault after 6 hours from the beginning of the simulation. Playing with...
  8. A

    Thomson aerosol aware mp=28 and real data for aerosols

    Hello, It is not clear to me what kind of files I need to process into metgrid for real time aerosol (GEOS-5 product) into WRF with mp = 28. Suppose that I want to run a forecast starting at 00Z for the 26th of June and a forecast length equal to 168 h. I suspect that the aerosol file is...
  9. Y

    WRF v4.0 BEM conflicts with isfflx=1

    Dear Community,WRF v4.0, BEM conflicts with isfflx=1,Namelist see attachment .Thanks very much!
  10. C

    About the modification of roughness length and zero-plane displacement

    Dear WRF community, Recently, our team is trying to modify the roughness length and zero plane displacement in WRF codes (version 4.0). When we grep "roughness length" and "zero plane displacement" in "/phy *.F", it is found that various ".F" files contain "roughness length", including...
  11. P

    What is the purpose of look-up tables in surface layer parameterization?

    Hi all I am working on the surface layer parameterization schemes in the WRF model. The revised MM5 surface layer scheme uses look-up tables to calculate the values of stability functions for momentum and heat. Is it necessary to use lookup tables? Could we directly call the functions defined...
  12. C

    About LANDUSE.TBL use of summer/Winter data

    The LANDUSE.TBL file has summer and winter parameters, how does WRF knows when use summer or winter? the months are set by default or can be modified in other file? and if it's used in the southern hemisphere, is it ok to use the same file or has to be adapted?
  13. M

    Use of option o3input=0

    Hi all, I am working on the effect of short lived climate forcers (SLCFs) to the radiation and energy balance, on simulation with semi-hemisferic domain over the Arctic. I have tried to use the ozone calculated from WRF in the RRTMG radiation scheme, instead to use the default value from a...
  14. 2

    WRF windfarm

    Hello everyone, I have encountered a problem, that is, I have set windfarm_opt in WRF to turn on the wind farm, but it has not been able to work since I succeeded once. I changed the location and still failed, and then I adjusted the physical parameterization. Scheme, I want to ask if anyone...
  15. H

    Unrealistic (?) PBLH results

    Hi, As far as I know, PBL height is expected to be between 100-2000 m, roughly. However, I'm getting PBLH as low as ~5m. Moreover, when I interpolate the fields on vertical plane cuts, the pblh distribution seems to be quite erratic along neighboring planes: it varies from 5 to 800 meters...
  16. T

    Unstable LAI with dynamic vegetation in NoahMP

    Hi all, I'm finding that LAI is unstable and eventually goes to zero over a multi-year simulation when I turn on dynamic vegetation in Noah-MP. The attached image shows 5 years of LAI over a grid cell defined as an Evergreen Needleleaf Forest and another as Savannah. I've run with dynamic...
  17. W

    WRF4.2 irrigation scheme is bad

    Dear friends: I want to simulate from June 1, 2018 to September 30, 2018, and put the downloaded irrigation data (irrigation/fao/00001-04320.00001-02160 and index downloaded from the official website) into the static terrain data geog in the WRF4.2 version , and then namelist.input input...
  18. C

    WRF V4.3.2 NOAH_MP BEP/BEM very low nighttime 2m air temperatures

    Dear all, I perform some ultra-high resolution simulations during a heat-wave period with WRF coupled to BEP/BEM urban canopy model using the NOAH_MP land surface model. Attached you can find the namelist.input I use. Initially, I used version 4.3, but recently I applied also version 4.3.2, as...
  19. G

    Methane plume simulation LES

    Hello, I'm new to the WRF and doing my academic research on greenhouse gases, especially CH4. I want to recreate LES from this paper https://amt.copernicus.org/articles/11/5673/2018/. Could anyone help or guide me?
  20. M

    set the cloud droplet number concentration to a constant value

    Dear, I'm wondering how to set the cloud droplet number in the Purdue Lin microphysics scheme (Lin et al., 1983) to a constant value to study ACI when running WRF-Chem. Could you help me solve it? Best regards Maosier
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