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The North Atlantic is the most intense region of ocean CO2 uptake interm of units per area. Here, we investigate multidecadal timescalevariability of the partial pressure of CO2 (pCO2) that is dueto the natural carbon cycle, using a regional model forced with realisticclimate and preindustrial atmospheric pCO2 for 1948–2009.Large-scale patterns of natural pCO2 variability are primarilyassociated with basin-averaged sea surface temperature (SST) that, in turn,is composed of two parts: the Atlantic Multidecadal Oscillation (AMO) and along-term positive SST trend. The North Atlantic Oscillation (NAO) drives asecondary mode of variability. For the primary mode, positive AMO and theSST trend modify pCO2 with different mechanisms and spatial patterns.Positive AMO is also associated with a significant reduction in dissolvedinorganic carbon (DIC) in the subpolar gyre, due primarily to reducedvertical mixing; the net impact of positive AMO is to reduce pCO2 inthe subpolar gyre. Through direct impacts on SST, the net effect of positiveAMO is to increase pCO2 in the subtropical gyre. From 1980 to present,long-term SST warming has amplified AMO impacts on pCO2

biogeosciences

Climate impacts on multidecadal &amp;lt;i&amp;gt;p&amp;lt;/i&amp;gt;CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; variability in the North Atlantic: 1948–2009