I am conducting experimental simulations to study the PM 2.5 concentration.I have tried several chemistry options ranging from RADM2 MADE/SORGAM to MOZCART aerosol chemistry. The simulation was successful but I am getting very low values of PM 2.5 of the order of 0.1 to 0.9 ugm-3 which should be of the order 100 to 900 ugm-3. I am confused as to where I am making mistake. has anyone come across similar kind of issue with PM 2.5 concentration?. what should be my next step in resolving this issue?. I am using EDGAR HTAP and FINN data as an input data to include PM2.5 estimates. I am having doubts especially in the above emission input files. kindly check and see if there is any changes needed in the namelist flie of emission data especially the spc_map part of the namelist.
Anthro_emiss spc map emis_map = 'CO->CO','NO->NOx','SO2->SO2','NH3->NH3','BC(a)->BC','OC(a)->OC','PM_25(a)->PM2.5','PM_10(a)->PM10','BIGALK->BIGALK','BIGENE->BIGENE','C2H4->C2H4','C2H5OH->C2H5OH','C2H6->C2H6', 'CH2O->CH2O','CH3CHO->CH3CHO','CH3COCH3->CH3COCH3','CH3OH->CH3OH','MEK->MEK','TOLUENE->TOLUENE','C3H6->C3H6','C3H8->C3H8','NO2->0.0*NOx','ISOP->0.0*CO','C10H16->0.0*CO','SULF->0.0*SO2'
Fire_emiss spc map wrf2fire_map = 'co -> CO', 'no -> NO', 'so2 -> SO2', 'bigalk -> BIGALK', 'bigene -> BIGENE', 'c2h4 -> C2H4', 'c2h5oh -> C2H5OH', 'c2h6 -> C2H6', 'c3h8 -> C3H8','c3h6 -> C3H6','ch2o -> CH2O', 'ch3cho -> CH3CHO', 'ch3coch3 -> CH3COCH3','ch3oh -> CH3OH','mek -> MEK','toluene -> TOLUENE', 'nh3 -> NH3','no2 -> NO2','open -> BIGALD','c10h16 -> C10H16', 'gly -> CH3COCHO','acetol -> HYAC','isop -> ISOP','macr -> MACR' 'mvk -> MVK', 'ch3cooh -> CH3COOH','cres -> CRESOL','glyald -> GLYALD','mgly -> CH3COCHO','oc -> 0.24*PM25 + 0.3*PM10;aerosol', 'bc -> 0.01*PM25 + 0.08*PM10;aerosol','sulf -> -0.01*PM25 + 0.02*PM10;aerosol', 'pm25 -> 0.36*PM25;aerosol','pm10 -> -0.61*PM25 + 0.61*PM10;aerosol'
I have seen reasonable amount of PM2.5 over India from the WRF-Chem using the RADM2 MADE SORGAM. As you mention that changing chemistry to MOZCART also did not improve the model performance in your case, it is possible that your input emission has some issue. Pl check wrfchemi files how PM emission data is written there. If unresolved, you may send me a sample plot of PM2.5 emission and I can tell if these values look fine (and also correct units). All the best.
Ojha: often an issue is that you are missing emission sources (e.g., low VOC), chemical reactions (e.g., low SVOC). However, check your meteorology solution, e.g., some precip/cloud wet biases as photochemical reactions may be underrepresented.
I have the same issue. I checked the wrfchemi files and the problem is likely in there, but I don't know how to correct the values.
I will be very grateful for help
It is a recurrent problem to have underestimations of the emissions due to error in the emissions preprocessors, finally affecting the wrf-chem final results by several orders of agnitude. A new tool called EPA_ANTHRO_EMIS was recently released, it may help to solve this issue:
https://www2.acom.ucar.edu/wrf-chem/wrf-chem-tools-community
I hope this help you.
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