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But the mechanism is different, so far as I understand. The sulfur rich fuels supports marine cloud brightening and ship tracks. (Low clouds reflect heat, while high clouds absorb) The loss of the ship tracks accounts for a big jump in the warming effects of shipping.

https://ntrs.nasa.gov/api/citations/20220015136/downloads/Yu...

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The mechanism is different from the impact of sulphur in the stratosphere (where there are no clouds), but it is the same as the mechanisms that have caused the majority of the aerosol cooling (a brightening of clouds).

The same ze of the cooling has long been uncertain though. It depends a lot on assumptions you make about the pre-industrial atmosphere,something that we don't have great observations of.

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