Hauck, Judith; Völker, Christoph (2015): Southern Ocean CO2 uptake and buffer factor from model run 2012-2100, with links to model results. PANGAEA, https://doi.org/10.1594/PANGAEA.841611, Supplement to: Hauck, J; Völker, C (2015): Rising atmospheric CO2 leads to large impact of biology on Southern Ocean CO2 uptake via changes of the Revelle factor. Geophysical Research Letters, 42(5), 1459-1464, https://doi.org/10.1002/2015GL063070
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The Southern Ocean is a key region for global carbon uptake and is characterised by a strong seasonality with the annual CO2 uptake being mediated by biological carbon draw-down in summer. Here, we show that the contribution of biology to CO2 uptake will become even more important until 2100. This is the case even if biological production remains unaltered and can be explained by the decreasing buffer capacity of the ocean as its carbon content increases. The same amount of biological carbon draw-down leads to a more than twice as large reduction in CO2 (aq) concentration and hence to a larger CO2 gradient between ocean and atmosphere that drives the gas-exchange. While the winter uptake south of 44°S changes little, the summer uptake increases largely and is responsible for the annual mean response.
The combination of decreasing buffer capacity and strong seasonality of biological carbon draw-down introduces a strong and increasing seasonality in the anthropogenic carbon uptake.
All data is processed model output from the MITgcm-REcoM2 model as described in the manuscript.
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