| Summary: | This is showing different source regions. This upper one is looking at sulfate, which is of stratospheric origin. You’ll notice up there we have, right above sulfate, total. In other words, the sulfate dominates the mass of the aerosols. What is the sulfate? It is mainly sulfuric acid and partially neutralized sulfuric acid. But as we found out in later years, when we did more detailed work on it, it really is almost pure sulfuric acid. The bottom ones, we show oceanic, which would be sea salt, crustal dust, and the biogenic component that we thought was pollution, but it turned out to be from biogenic activity in the ocean. And it is the one that looks a little different due to transport because it’s mainly being transported through the stratosphere from oceanic aerosols.
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