So what does #IPCC AR6 say about ocean acidification?

Working group 1 describes the biogeochemical changes in the ocean. Impacts on organisms and ecosystems will be described in working group 2, to be published in February 2022, but let's see:

A thread
1/x The ocean has taken up ~a quarter of anthropogenic CO2 emissions; it is basic chemistry and understood since Revelle & Suess in the 1950s that CO2 reacts with seawater, leading to a decrease in carbonate ions and an increase in hydrogen ions. This lowers the ocean pH value.

2/x

My most important take-away from the Global #Carbon Budget 2020:

While emissions dropped by an unprecedented 7%, atmospheric CO₂ not only kept growing, it kept growing by pretty much the same amount as in 2019 (+2.5 ppm)

Why? ⬇️ (1) of course atmospheric CO₂ kept growing because we were still emitting massive amounts of CO₂, 34.1 GtCO₂ from fossil fuels plus 5.9 GtCO₂ from land-use change - a similar amount as in 2012, which says something about the fast increase of emissions in the last years

and