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"In contrast to recent claims, trends in the airborne fraction of anthropogenic carbon cannot be detected when accounting for the decadal-scale influence of explosive volcanism and related uncertainties."
I don't get it. Yes, volcanism can affect the climate through the release of aerosols that partially block out the sun and tend to counteract the effects of greenhouse gases. But how does that change the amount of anthropogenic carbon going into the air or change the action of the CO2 sinks?

This was a modeling study; the authors found that earlier studies incorrectly modeled large volcanic eruptions and some decadal changes. When modeled correctly they found no change in the percent of carbon dioxide going into sinks (versus staying in the atmosphere).

... it makes no sense to say the "airborne fraction of anthropogenic carbon cannot be detected".

They wrote there was no trend in the airborne fraction; it is the same as it was half a century ago. The biosphere, the oceans, etc. are still absorbing as they always have and are not saturated.

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