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geoschem / GCHP

The "superproject" wrapper repository for GCHP, the high-performance instance of the GEOS-Chem chemical-transport model.
https://gchp.readthedocs.io
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[QUESTION] NOx data CEDSv2 inventory #219

Closed lorenzocostantino closed 2 years ago

lorenzocostantino commented 2 years ago

Hi,

I see in urls.txt file that GCHP download the following file for CDESv2 nitrogen emissions : http://geoschemdata.wustl.edu/ExtData/HEMCO/CEDS/v2021-06/2019/NO-em-anthro_CMIP_CEDS_2019.nc

And then it is used to derive emissions by sector, as shown by ExtData.rc :

CEDS_NO_AGR  kg/m2/s N Y F%y4-%m2-01T00:00:00 none none NO_agr  ./HcoDir/CEDS/v2021-06/%y4/NO-em-anthro_CMIP_CEDS_%y4.nc
CEDS_NO_ENE  kg/m2/s N Y F%y4-%m2-01T00:00:00 none none NO_ene  ./HcoDir/CEDS/v2021-06/%y4/NO-em-anthro_CMIP_CEDS_%y4.nc
CEDS_NO_IND  kg/m2/s N Y F%y4-%m2-01T00:00:00 none none NO_ind  ./HcoDir/CEDS/v2021-06/%y4/NO-em-anthro_CMIP_CEDS_%y4.nc
CEDS_NO_TRA  kg/m2/s N Y F%y4-%m2-01T00:00:00 none none NO_tra  ./HcoDir/CEDS/v2021-06/%y4/NO-em-anthro_CMIP_CEDS_%y4.nc
CEDS_NO_RCO  kg/m2/s N Y F%y4-%m2-01T00:00:00 none none NO_rco  ./HcoDir/CEDS/v2021-06/%y4/NO-em-anthro_CMIP_CEDS_%y4.nc
CEDS_NO_SLV  kg/m2/s N Y F%y4-%m2-01T00:00:00 none none NO_slv  ./HcoDir/CEDS/v2021-06/%y4/NO-em-anthro_CMIP_CEDS_%y4.nc
CEDS_NO_WST  kg/m2/s N Y F%y4-%m2-01T00:00:00 none none NO_wst  ./HcoDir/CEDS/v2021-06/%y4/NO-em-anthro_CMIP_CEDS_%y4.nc

Looking file specifications, it says : Annual Anthropogenic Emissions of NOx prepared for input4MIPs

But when selecting a one specific field/sector I see: NO anthropogenic emissions from .... sector

I would like to know if this file refers to NO or NOx (or NOx expressed as NO) ?

lizziel commented 2 years ago

Hi @lorenzocostantino, thanks for asking about this. While the original CEDS data contains NOx we convert it to NO during pre-processing of the data for use in GEOS-Chem. The pre-processing is briefly mentioned in our data README, and you can see how this specific conversion is done in file CEDS_edit.sh at http://geoschemdata.wustl.edu/ExtData/HEMCO/CEDS/v2021-06/scripts/. It looks like in our pre-processing we did not edit the global metadata and hence NOx is still present in some of the attributes.