wrf physics

Hello, I have couple of questions regarding the mp_physics = 28 option. I want to observe the differences in temperature when i run the model with "use_aero_icbc=.true." and "=.false.". 1) I didn't understand when "use_aero_icbc=.true." option is used, where the real-time/time-varying aerosol...

I find the WSM5 microphysics scheme in the Weather Research and Forecasting (WRF) model has two versions: the normal version 'module_mp_wsm5.F' and the accelerated version 'module_mp_wsm5_accel.F'. Is there an explanation of the differences and how to use the accelerated version?

Dear colleague, I hope this message finds you well. I am encountering an issue with the WRF model where after running the real.exe, the LU_INDEX representing lakes in the met_em file is 21, but it changes to LU_INDEX=17 in the wrfinput file. I have seen in previous discussions that this might...

I have been test a wrf example like this:ARW OnLine Tutorial. in Nested Domain (2-way, 2 Input Files): Metgrid I setted the namelist.wps as &share wrf_core = 'ARW', max_dom = 2, start_date = '2018-12-01_00:00:00','2018-12-01_00:00:00', end_date =...

I made modifications to the physical parameterization scheme and added one variable 'ALBOLD'. I added the new variable in Registry.EM_COMMON as follows: I have made changes to the original variable ‘SNOALB’ and the new variable ‘ALBOLD’ in the ‘wrfrst’ file after the spin-up time, but the...

I have carried out sensitivity experiment on sensible heat flux by modifying module_sf_sfclayrev.F file, and succeeded. But when I modify this file, LH*0.75, it doesn't change anything.

Hi WRF-forum, I am trying to understand how WRF treats its boundary condition over the ocean. I have a couple of questions listed below. Which variable does WRF use to compute heat fluxes in planetary boundary layer schemes, SST or skin temperature? Does WRF have an internal algorithm to...

Hi all, I find these package declarations in Registry.EM_COMMON, for example: package thompson mp_physics==8 - moist:qv,qc,qr,qi,qs,qg;scalar:qni,qnr;state:re_cloud,re_ice,re_snow or package myjpblscheme bl_pbl_physics==2 -...

Hi everyone, I modified the wrfrst file to replace half of the ocean with land. While the parent grid results are normal, I’m seeing discontinuities in specific humidity and temperature in the boundary layer when the nested grid (child grid) moves over the land area. Attached are the specific...

Model Code WRF 4.5.2 Noah-MP v4.5 Platform Linux x86_64 INTEL (ftn/icc): Cray XC (dmpar) Model Summary 4km SE USA Restart run starting from Oct. 1974 through Dec. 2020 Forced with ERA5 from the Copernicus CDS via python API Geogrid run with GEOGRID.TBL.ARW.noahmp Notable modules: Thompson MP...

I wanted to know U value of roof or thickness of roof when using sf_urban_physics = 3. and how we can change it

I am investigating options for obtaining values of parameterised convective updraft and downdraft mass flux values from WRF for use in the EMEP chemistry-transport model at global scales. From the registry, I was interested in the UDR_KF, DDR_KF, UER_KF and DER_KF variables for up/downdraft...

I try to run my wrf model over three months (MAM) using cfs data but i am have a problem ,which is in the wrfbdy file the dates stops in "2024-05-18_06:00:00"

Dear Support, In my idealized experiment, I added a land area with a terrain height of 2 meters and fixed soil moisture at 30%. The land surface scheme is Noah LSM, and the initial surface temperature is set to 301.65K (originally 280K in the code). However, when the model starts integration...

I want to study sea-land breeze in different thermodynamic case. case 1 : sea-land temperature difference is 5 degree C. case 2 : sea-land temperature difference is 10 degree C. it doesn't need to be correctly '5' or '10' degree C, but I want to see the difference of wind, snow in different...

Hi all; I am using wrf(v4.2) to run a case.And I have create 31-33 urban category in geo_em.d01.nc.The variable LU_INDEX and LANDUSEF also have the corresponding values.But when i run the case with the setting,it didn't work with the urban area.To sovle the problem,i use the same geo file...

I am having trouble understanding the dissipation term for turbulent kinetic energy in Boulac scheme. As per the the 1989 paper from Bougeault and Lacarrere the dissipation term is given by dissipation term = -ceps_b * te1**1.5 / dl1 . (assuming my understanding that te1 was the tke bounded by...

Hello everyone, We are trying to run a couple of simulations using WRF v 4.6.0 to evaluate the impact of green roof. We are using default (MODIS) as static land data and CFSv2 as dynamic weather data. We were able to run the model perfectly (in parallel mode) for the base case and validate the...

I am using sf_urban_physics=3 and i dont get values for TR_URB. Attached are the imagaes for all 3 domains

Hello, I am looking for the following equation in the wrf model: According to this paper, Robinson and Businger 2019, this is how the lowest-level vertical motion in WRF is calculated. Can anyone point me to the fortran module that computes this? Thank you in advance! I'll appreciate any help!