Online vs offline dust emission

[ChangpeiHe]

Your name

Changpei He

Your affiliation

Tsinghua University

Please provide a clear and concise description of your question or discussion topic.

I'd like to know whether the online dust emission scheme was updated according to the scheme described in Meng et al. (a high-resolution dust source function and global annual dust emission strength of 2000 Tg yr−1 rather than 909 Tg yr−1 ) for current version of GEOS-Chem (e.g., v14.x.x)?

[yantosca]

Thanks for writing @ChangpeiHe. I believe the dust emissions are scaled to match the emissions for the year 2000, and the other years are allowed to vary.

Tagging @yuanjianz @YanshunLi-washu who have worked with the offline emissions more than I have.

[yuanjianz]

I think the offline emission are scaled to 2000Tg for 2016. The scale factor for 2016 is used for other years. I am not sure about how the current scaling factors for the online emission in configuration files were generated (But I guess they are also for 2016?).

[YanshunLi-washu]

Hi. I agree with Yuanjian for offline dust emission. Not sure about developments on online emissions to match offline emissions in yr question, Jun Meng at WSU (https://www.jun-meng.com/) might be a better contact.

[yuanjianz]

Noted:
Although I am not sure about current version (e.g., v14.x.x), I can confirm that after this update #2512, the online scaling factor is matching offline emission (2000Tg in 2016). These scaling factors are only compatible with the DustDEAD update that uses USTAR geoschem/HEMCO#279.

[ChangpeiHe]

Thanks! I believe online emissions would match offline emissions in the future version.