Mahadevan A. auteur aut IRD Tagliabue A. auteur aut IRD Bopp L. auteur aut IRD Lenton A. auteur aut IRD Memery Laurent auteur aut IRD Levy M. auteur aut IRD text journalArticle eng Episodic events like hurricanes, storms and frontal-and eddy-driven upwelling can alter the partial pressure of CO2 (pCO(2)) at the sea surface by entraining subsurface waters into the surface mixed layer (ML) of the ocean. Since pCO(2) is a function of total dissolved inorganic carbon (DIC), temperature (T), salinity and alkalinity, it responds to the combined impacts of physical, chemical and biological changes. Here, we present an analytical framework for assessing the relative magnitude and sign in the short-term perturbation of surface pCO(2) arising from vertical mixing events. Using global, monthly, climatological datasets, we assess the individual, as well as integrated, contribution of various properties to surface pCO(2) in response to episodic mixing. The response depends on the relative vertical gradients of properties beneath the ML. Many areas of the ocean exhibit very little sensitivity to mixing owing to the compensatory effects of DIC and T on pCO(2), whereas others, such as the eastern upwelling margins, have the potential to generate large positive/negative anomalies in surface pCO(2). The response varies seasonally and spatially and becomes more intense in subtropical and subpolar regions during summer. Regions showing a greater pCO(2) response to vertical mixing are likely to exhibit higher spatial variability in surface pCO(2) on time scales of days. specialized CO2 oceanic pCO(2) dissolved inorganic carbon sea-surface variability vertical mixing 369 1943 2009-2025 2011 1364-503X https://www.documentation.ird.fr/hor/PAR00009913 10.1098/rsta.2010.0340 1364-503X https://www.documentation.ird.fr/hor/PAR00009913 IRD - Base Horizon / Pleins textes 2013-02-20 2017-08-23 PAR00009913 fre