1A3di_Oil_Tanker_Loading only in USA, only for BC/OC?

[jkikstra]

For use in CMIP7, it is key to harmonize and grid future data in a similar fashion as historical data is gridded.

One of the sectors that we aggregate CEDS data into for harmonization (and subsequent gridding) is 'International Shipping'

That would intuitively be both "1A3di_International-shipping" and "1A3di_Oil_Tanker_Loading".

In v_2024_07_08: As expected, "1A3di_International-shipping" only has global (=international) data. Unexpectedly, "1A3di_Oil_Tanker_Loading" has data only for the USA, and only for BC and OC.

Question is: how to best deal with this?

• How is this dealt with for historical gridding?
• If it is important to grid it separately, that would be an argument for not gridding it using an 'International Shipping' pattern-scaling. However, if it is indeed important, then why is there only data for "usa" and not for other countries?

Or is it maybe a mistake in this version of the data? Reading the 'Data_and_Assumptions', I would have thought that it should only be in the "global" region? See for instance section 6.7 (Miscellaneous Process Emissions) and section 9.1 (CEDS Gridding Sectors).

Curious to hear more about this.

@ssmithClimate