Oxidised Nitrogen OxN (HNO3+NO3) --- SURF_ugN_OXN

[mvieno]

Hi,
in the https://www.emep.int/mscw/mscw_moddata.html the OXN variable is defined as:
the sum of HNO3 and NO3 (Compounds in NetCDF files).

In the code rv5.0 the OXN group is defined as follow:
OXN_GROUP = (/ &
NO, NO2, NO3, N2O5, HONO, HNO3, HO2NO2, SC4H9NO3, NALD, &
ISON, PAN, MPAN, NO3_f, NO3_c, shipNOx &
/)

Are the published OXN results in the website calculated in a different way?

Massimo

[mifads]

I wouldn't think so; why? I cc @alvaro who made those results.

[avaldebe]

I wouldn't think so; why? I cc @alvaro who made those results.

Sorry, I was not involved with the runs for the status report.

@WillemVanCaspel @heikoklein do you know how are the published results are calculated?

Are the published OXN results in the website calculated in a different way?

I think issue here is the mismatch between OXN definition on the model vs the description on mscw_moddata

OXN has the same definition on version 5.0 and 5.5

emep-ctm/CM_ChemGroups_mod.f90

Lines 67 to 71 in 78abe58

	integer, public, target, save, dimension (15) :: &
	OXN_GROUP = (/ &
	NO, NO2, NO3, N2O5, HONO, HNO3, HO2NO2, SC4H9NO3, NALD, &
	ISON, PAN, MPAN, NO3_f, NO3_c, shipNOx &
	/)

emep-ctm/CM_ChemGroups_mod.f90

Lines 67 to 71 in 8d8a458

	integer, public, target, save, dimension (15) :: &
	OXN_GROUP = (/ &
	NO, NO2, NO3, N2O5, HONO, HNO3, HO2NO2, SC4H9NO3, NALD, &
	ISON, PAN, MPAN, NO3_f, NO3_c, shipNOx &
	/)

Which does not match the description on mscw_moddata

 - Oxidised Nitrogen OxN (HNO3+NO3) --- SURF_ugN_OXN