higher concentrations with WRF-Chem MOZART_MOSAIC-4bins with FINN emissions
Ana Carla Fernandez
Hi All,
My name is Ana Carla, I am a Ph.D student at Washington State University and I am currently working with WRF-Chem MOZART_MOSAIC-4bins with FINN emissions and I am getting a really highly PM and Ozone surface concentrations in my simulations.
One of my first ideas of why this could be happening pertains to the to fire emissions, I am thinking the WRF-Chem isn’t doing well the fire vertical distribution. Since wrffirechemi* file has 2D fields, I looked inside wrfout* files to analyze ebu_oc variable, and as I suspected that variable is concentrated close to the surface (see attached image), so it is not correctly vertical distributed. So, my question is:
Does someone know how the wrf-chem, with the configuration that I mentioned before, does the fire vertical distribution?
Luke Conibear
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Mary Barth
Ana Carla Fernandez
Hi Luke, thanks for your answer.
First, I am using the 3.9.1 version of WRF-Chem.
My namelist chemistry settings are:
chem_opt = 202
biomass_burn_opt = 2
plumerisefire_frq = 30
scale_fire_emiss = .true.,
Yes, I am using fire_emis (fire_emis_mozart4mosaic4bin.inp). And my wrf2fire_map variable is described as follow:
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',
'ch3cooh -> CH3COOH','cres -> CRESOL','glyald -> GLYALD','mgly -> CH3COCHO',
'gly -> CH3COCHO','acetol -> HYAC','isop -> ISOP','macr -> MACR', 'mvk -> MVK',
'oc -> OC;aerosol','pm10 -> PM10;aerosol','pm25 -> PM25;aerosol',
'bc -> BC;aerosol'
I attached the namelist file here. Please let me know if there is any wrong setting I am using here.
Thank you so much in advance!
Luke Conibear
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--Luke Conibear
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Caterina Mogno
Hi all,
I am getting a similar problem but on top of the model. I have non-physical concentrations of sulphate, and I believe it is linked somehow to fire emissions.
Concentrations for aerosols up to vertical level 26
are reasonable (top of model pressure is 50hPa, total 33 layers).
However, for the last 6-7 layers (27-33) I get non physical concentrations
of sulphate.
They starts as little points, and then propagate becoming bigger by the times goes by. (I have attached a series of images).
It happens both when using chem_opt=201 and 202.
Doing some testing, I find out that if I switch off fires completely, these concentrations disappear. I further tested with:
1) 1 Checked for small negative values in the fire emissions and set them to zero.
2) 2 Reduced the plumerise frequency to be equal to the chemical timestep (6 min in my case).
3) 3 Switched off the plumerise by putting plumerise_freq=0.
4) 4 Put a low threshold on the maximum values of the fire emissions.
However, in all these other test case the sulphate concentration is still there at the top.
Has someone got the same problem? Or could suggest a way around?
I have attached for completeness my namelist.input and the wrf2fire_map for fire_emiss.
Thank you very much in advance for your help!
Best,
Caterina
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