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Hi Naser, Phot_opt = 1 is the recommended photolysis scheme for this chemical option. Please try setting chemdt = 0 and turning off all interactions with physics/aerosols, leaving only gas chemistry on. Also, what do your initial conditions look like? Have you performed more than one day of...

Hi, please try setting chemdt = 0. Chem_opt = 202 is a very large package and requires significant computational overhead.

Hi, please try setting: mozart_ph_diag = 1

Hi Naser, Please provide your namelist. Also, do you see a typical diurnal cycle of NO2? How "low" is low? Jordan

Hi, conc x 1e6 = ppm conc x 1e9 = ppb conc x 1e12 = ppt Jordan

Hi Liqing, Please attach your changes to the code. Did you './clean -a' before recompiling? Jordan

Yes, just comment them out and recompile and they won't show up anymore. Jordan

Hi, I am looking back at your modifcation, and I don't think it is appropriate to reset the debug level within module_optical_averaging.F (If this is not what you've done, please attach a differenced file). Why don't you just reduce your debug level in your namelist to < 100. Or just comment...

Hi, You said "I think the model has extracted the temperature at 1000m height above the ground surface" - what make you think this? How are you extracting the data to compare? Do you see these low values when looking at the file through, e.g., ncview? Jordan

Hi Prerita, If the only changes you made were to the emissions, please double check that your emission modifications were successful and did not produce spurious values that could crash the chemistry. Also, please look at the tail of other rsl.* files as there are often unique messages in the...

Hi Ankan, You could try India’s Central Pollution Control Board (CPCB), I don't remember if they have BC specifically. Otherwise you can search for field campaigns and modify your time period. Jordan

Hi Phillip, This looks to include what you need, of course you could take a look at NCAR's EPA_ANTHRO_EMIS tool that does what your NCL script does. 1) Did you include wildfire emissions? This could be the reason for low estimates in summer? 2) What horizontal and # of vertical levels are you...

Ankan, You need to multiple the mass mixing ration by air density (kg/m3), where rho = (1/287)*P/T. Aerosol datasets will depend on the region of interest, e.g., the IMPROVE network over the US has BC. Jordan

Hi Peng, PAR is a chemical compound (parrafins), not photosynthetically active radiation. You are looking for the diagnostic "ph_par" part of phot_opt=4. You will need to change the registry or add the ph_par field to an io_fields file (see User Guide) if you want to output it. Jordan

Hi Mauro, You have aer_ra_feedback = 1, so while ozone impacts on radiation will be the same between CTRL and RUN1, you'll have the impacts from your prognostic aerosols. AER_OPT = 0 does NOT turn off impacts from prognostic aerosols, it just tells the model not to input a climatology. A...

Hi Mauro, Will take a look at this. Can you attach your namelist (input and output)? Also, which version of WRF-Chem are you using? Thanks. Jordan

Hi, it is not clear from your rsl.error what has occured. Please look at the tail of your other rsl.error and rsl.out files to see if there is more unique information. Jordan

Hi Soroush, Apologies, it looks like those variables are in a package: package diag_aero aero_diag_opt==1 -...

Hi Soroush, It's unclear to me why the io_fields options isn't working. You can try modifying the registry instead: state real soa_a01 ikj misc 1 - r "soa_a01" "soa_a01" "ug m^-3" to state real soa_a01...

HI, There is a bug in the v4.4 release. If you issue the compile command again (after the failed compile), it should compile fine. Otherwise, see: WRF-Chem v4.4