Scheduled Downtime
On Friday 21 April 2023 @ 5pm MT, this website will be down for maintenance and expected to return online the morning of 24 April 2023 at the latest


  1. A

    Query regarding the calculation of Aerosol-Cloud Interaction using WRF-Chem

    Dear all, I have a small query regarding the computation of the perturbation in atmospheric variables due to aerosol-cloud interaction (ACI) using the WRF-Chem model. In the case of aerosol-radiation interaction (ARI), the perturbation in atmospheric parameters can be computed by taking the...
  2. S

    WRF does not generate wrfout files after running for a period of time

    Dear all, I am running WRF-Chem-3.8.1 with chem_opt=9. I have been running WRF since 0:00 on July 15, 2016. Everything was fine at first, but by 17:00 on July 17, there were no wrfout files generated and everything seemed to be stuck. But I looked at the log file and there was nothing...
  3. J

    wrf-chem tutorial exercise 1:after running real.exe,when l used nvciew viewing wrfinput_d01,the value of dust_1 is all 0.

    i wonder why this happens ?how can i solve this problems? namelist.input is below. thank you very much!
  4. J

    “WRF-chem”-Website tutorial-“exercise1”-Insufficient variable problem

    after finishing DUST1,there is “ncview wrfinput_d01”,but in my view has not sufficient variable.l really wanna know why?anbody can help me?(sorry,my engish is not good) thank you very much!
  5. A

    Are the SW Accumulated and Instantaneous Fluxes variables not printed in the WRF-Chem output file while considering Goddard SW Radiation Scheme?

    Dear all, I used the Goddard scheme for SW Radiation and the RRTMG scheme for LW Radiation while running WRF-Chem using RADM2-MADE/SORGAM chemistry options. I want to calculate the net SW radiative flux in the atmosphere using this formula:ΔFatm = ΔFTOA - ΔFsurf However, I noticed that only the...
  6. H

    Converting the cam-chem dataset to WRF-Chem's initial and boundary chemical fields

    Hi everyone, I want to convert cam-chem dataset to WRF-Chem's initial and boundary fields following saprc99 chemical mechanism, but there is no saprc99.inp in mozbc. I already knew that cam-chem dataset following mozart mechanism, here is VOC species mapping between MOZART and saprc99 mechanism...
  7. H

    The wrfout file does not contain any aerosol concentration variables

    Hi everyone, I want to perform WRF-Chem simulations with MOSAIC options to study aerosol mass and number concentrations in each bin. The wrfout** file does not contain any aerosol concentration variables. I am wondering if there is errors in the namelist settings (namelist.input) and...
  8. 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...
  9. A

    Query on the unit conversion formula of the aerosol species output of WRF-Chem simulation

    Dear everyone, I have some doubts about the unit conversion of aerosol species. I ran WRF-Chem using the RADM2-MADE/SORGAM chemical mechanism. I viewed the output using the MATLAB command ncdisp. Some portions of the displayed lines are as follows: eci Size: 405x415x34x217...
  10. P

    Research positions open at IIT Bombay

    We have a few positions at IIT Bombay that we seek to fill quite urgently under a newly funded project (PAVITRA—Air Pollution Management and Intervention Tool for India). Please see the job profile, and interested candidates may kindly apply through the below link: 1. Project Research...
  11. Z

    wrf 4.5 & 4.4 chem compile issue attached log file

    hello there, i am trying to install wrf chem model, everything goes well when i try to compile, it show this error "Problems building executables, look for errors in the build log" i went to log file and check the error "ERROR: variable name for third body in KPP species file is expected to be...
  12. R

    Cannot progress WRF-Chem beyond a couple of hours: error (78) process killed (SIGTERM)

    Hi all, Fairly new WRF-Chem user here. I'm trying to run WRF-Chem with CMBZ/Mosaic over northern Australia, nested simulation with resolutions of 27, 9 and 3 km. I am unable to progress the simulation beyond the first few hours, with persistent SIGTERM errors ( "error (78): process killed...
  13. N

    Problem with adding SOA variables in iofields in WRF-Chem V4.4.1

    Hi there, I'm trying to add some variables to my wrfout file. So, added these two lines to my namelist: Also, I defined the variables I wanted in my wrfout in man_output.txt file by adding this line: After running WRF-Chem, I have all the added variables in my wrfout, except for SOA...
  14. Y

    No "&chem" section in the namelist.input after compiling WRFV3.9.1.1

    Hi Everyone, I compiled the WRFV3.9.1.1 without errors and got the ndown.exe, real.exe. tc.exe and wrf.exe generated successfully. However, in the run/namelist.input, I didn't find the "&chem" block and found nothing about the chemistyr, emissions... Anyone knows how to fix it? The...
  15. F

    forrtl: severe (64): input conversion error, unit -5, file Internal Formatted Read

    Hi, I am using WRF-chem 4.4.1, but while running the wrf.exe, I am getting the following error. Timing for Writing wrfout_d01_2019-11-01_00:00:00 for domain 1: 32.39404 elapsed seconds mediation_integrate: med_read_wrf_chem_emissions: Read emissions for time 2019-11-01_00:00:00...
  16. A

    Error in running WRF-Chem using RADM2-MADE/SORGAM after making boundary conditions for nested domain using ndown

    Hello everyone, I gave a WRF-Chem run of the direct effect using the RADM2-MADE/SORGAM chemistry option. The thing is, the simulation of the parent domain was completed successfully without throwing any errors or warnings. But when I gave a simulation for the nested domain after including...
  17. Y

    forrtl: severe (174): SIGSEGV, segmentation fault occurred

    Hi, I am using WRF-chem 4.4.1, but while running the wrf.exe, I am getting the following error. WRF NUMBER OF TILES = 1 d01 2017-11-01_00:00:00 ---------------------------------------- d01 2017-11-01_00:00:00 W-DAMPING BEGINS AT W-COURANT NUMBER = 1.000000 d01 2017-11-01_00:00:00...
  18. C

    Cannot open file 'wrfem_00to12z_d01' Error in convert_emiss.exe

    I was following this tutorial for WRF-Chem with volcanic ash simulations (, with slight modifications with the namelist.input and using WRF-Chem 4.4.2. During the conversion of the emission files from PREP-CHEM-SRC-1.5...
  19. Y

    Strange T2 in WRF v4.4.2 and v4.5 after reinitialization

    Hi all, I am using WRF-Chem v4.4.2 under a triple nested domain (36 km, 6 km, and 1 km) in August 2019. In 6 km and 1km simulations, there is a strange T2 cold bias after several hours of reinitialization. Consequently, simulations crash. I tested different versions of WRF from v4.1.4 to v4.5...
  20. A

    Large total optical depth warnings in running WRF-Chem while using RADM2-MADE/SORGAM chemistry option (chem_opt=11)

    Dear all, I am running WRF-Chem (version using RADM2-MADE/SORGAM, including aqueous reactions (chem_opt=11). I have successfully prepared anthropogenic emission input data from the EDGAR v5 MOZART dataset using anthro_emis, biogenic emission input data from the MEGAN dataset using...