CAM-Chem tagged

[jinmuluo]

Dear ACOM scientists

I don't know if anybody is working on the tagged method right now, but try to ask if the tagged method works on all tracers in CESM? For example, I want to track the O3 concentration from different sources of NOx emission. Do I need to tag both NOx emission and O3 and all the other species in between the NO-VOCs-O3 chemistry as the paper does (https://gmd.copernicus.org/articles/5/1531/2012/gmd-5-1531-2012.pdf).

Another question is if I set up multiple tagged NOx, so I should be able to run one simulation to see all different sources' contribution to O3, right?

best,

 

[rrbuchholz]

Dear Jinmu,

This paper describes an updated approach to tagging ozone sources in CESM:

TOAST 1.0: Tropospheric Ozone Attribution of Sources with Tagging for CESM 1.2.2

Abstract. A system for source attribution of tropospheric ozone produced from both NOx and volatile organic compound (VOC) precursors is described, along with its implementation in the Community Earth System Model (CESM) version 1.2.2 using CAM4. The user can specify an arbitrary number of tag...

gmd.copernicus.org

No one is actively working on this at NSF NCAR right now.

Once you have the tags set up, you only need to run one simulation to identify all the different sources.

Best,
Rebecca

 

[jinmuluo]

Dear Jinmu,

This paper describes an updated approach to tagging ozone sources in CESM:

TOAST 1.0: Tropospheric Ozone Attribution of Sources with Tagging for CESM 1.2.2

Abstract. A system for source attribution of tropospheric ozone produced from both NOx and volatile organic compound (VOC) precursors is described, along with its implementation in the Community Earth System Model (CESM) version 1.2.2 using CAM4. The user can specify an arbitrary number of tag...

gmd.copernicus.org

No one is actively working on this at NSF NCAR right now.

Once you have the tags set up, you only need to run one simulation to identify all the different sources.

Best,
Rebecca

Thank you, Rebecca.

 

[jinmuluo]

Dear Jinmu,

This paper describes an updated approach to tagging ozone sources in CESM:

TOAST 1.0: Tropospheric Ozone Attribution of Sources with Tagging for CESM 1.2.2

Abstract. A system for source attribution of tropospheric ozone produced from both NOx and volatile organic compound (VOC) precursors is described, along with its implementation in the Community Earth System Model (CESM) version 1.2.2 using CAM4. The user can specify an arbitrary number of tag...

gmd.copernicus.org

No one is actively working on this at NSF NCAR right now.

Once you have the tags set up, you only need to run one simulation to identify all the different sources.

Best,
Rebecca

Hi Rebecca,

Do you know if any CESM tag or branch contains this NOx-VOCs-O3 tag code?

 

[tabishansari]

Hi Jinmu,

I'm working with the tagged CAM-Chem version. If you go to the supplementary material of the paper Rebecca has provided, you'll find a couple of perl scripts in the zipped file: add_tags.pl, tag_nox.pl, and tag_voc.pl. If you're only interested in tagging O3 in terms of NOx sources, you may only use the tag_nox.pl to generate the tagged chemical mechanism with your specified set of tags in conjunction with the add_tags.pl which will generate modified source code (Source Mods) with your specified set of tags. In add_tags.pl, you have a switch to specifiy whether you want to modify the source code for nox-tagging or voc-tagging. For your use case, you may specify nox-tagging. Then you'll generate the source mods and the chem_mech.in files which you need to put at the right locations (Source Mods and the case directory) and link the newly generated chem_mech.in in the env_build.xml file:

For example:
<!--"CAM configure options, see CAM configure utility for details (char) " -->
<entry id="CAM_CONFIG_OPTS" value="-phys cam4 -chem trop_mozart -offline_dyn -nlev 56 -usr_mech_infile /path-to-casedir/chemmech-with-tags.in" />

Then build the case.
Good Luck!