Re: How to use wrf-chem to simulate dimenthly sulfide(DMS)

[Mary Barth]

HI Qiwei,

It's best to send your questions to the google groups email list. I've added that group here because other members may be able to help you.

I have not worked with WRF-Chem and oceanic emissions. As far as I am aware, there is not a separate package to do oceanic emissions. However,  I recall that there is a WRF-Chem study for the VOCALS field campaign from PNNL (who implemented CBM-Z). It would be helpful to read that paper. 

It would be good for you to look through the chem/emissions_driver.F code to become familiar with how all the different emissions are read in and processed for different chemical mechanisms. If you want to use CBM-Z, then you can find out how it handles DMS emissions.  

One idea is if you have a file containing prescribed DMS fluxes and that is all the information that you need, then a shortcut is gridding those DMS fluxes onto the WRF grid mesh (e.g. through prepemis or anthro_emis preprocessors) and then putting that information into the wrfchemi files that were generated for the anthropogenic emissions. 

Good luck,

Mary

On Wed, Apr 17, 2024 at 1:16 AM Qiwei <qiwe...@gmail.com> wrote:

Dear Dr.Mary Barth

My name is Qiwei Dai and I'm a postgraduate from Sun Yat-sen University. I want to use WRF-Chem to simulate DMS and its impact on air quality. Although the user manuals do include some information about DMS, I still have many questions. I found your email address at https://groups.google.com/a/ucar.edu/g/wrf-chem-run. Though I have posted my questions to the WRF-Chem Forum already, I want to seek as many opportunities as possible to acquire guidance from experts like you.


As many articles mentioned, the sources of DMS include 3 main aspects: oceanic, anthropogenic and biogenic. Both anthropogenic and biogenic DMS emissions can be found in the official 'emission guide'. So my question is how to contain oceanic emission into WRF-Chem.


I notice there is a chemistry namelist option named 'dmsemis_opt', and the related explanation says 'need to provide dms reference field (currently only working for GOCART options)'. Suppose I have a netcdf file containing DMS sea surface concentration(or DMS flux), then how should I use it and make it a wrf-chem input file. I think each kind of emission input corresponds to an 'auxinput channel', for example, auxinput_5 -> Anthropogenic emissions and auxinput_6 -> Biogenic emissions (BEIS, MEGAN). But I can't see a channel corresponding to oceanic emission.


What's more, is GOCART the only alternative aerosol scheme to simulate DMS as the explanation says? In the registry.chem file, I found some other options include dms,dmsp, like CBM-Z. So if it's possible to use these other options to simulate DMS? And If so, the 'dmsemis_opt' should be set to 0 or 1?


I hope my description is detailed and comprehensible and any guidance is appreciated.


Best wishes
Qiwei Dai
qiwe...@google.com