Fig. 4. Time series of CO2 fluxes averaged over the Alboran Sea basin (alb, left panel), the northwestern Mediterranean area (nwm, central panel), and the Levantine Sea (lev, right panel). The spatial definition of those areas can be found in Lazzari et al. (2012). Blue solid lines indicate the fluxes with biology, red lines indicate the fluxes without biology. Positive fluxes indicate that the sea is absorbing CO2 (sink), negative fluxes indicate that it is outgassing CO2 (source). (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article).