Figure 2
Fractional OC dependence on δ13C in the fine (<2.5 μm in diameter) sea spray fraction combined with the simulations of the dual-pool mixing model.
The circle size represents sea salt concentration in μg m−3 with two actual concentrations noted next-to/inside it; circle colour represents the amount of OC in fine fraction; different colours of isolines represent simulations with fixed sea salt concentrations (light grey – 1.2 μg m−3, red – 1.7 μg m−3, purple – 2.7 μg m−3 and pale brown – 4.0 μg m−3); isolines represent carbon isotope ratios of phytoplankton (−30‰ to −25‰) related to sea surface temperatures within Circumpolar Antarctic Circulation (from −2 °C to +8 °C); light grey isolines represent full range of temperatures (from −2 °C to +20 °C) and corresponding phytoplankton isotope ratios (−30‰ to −19‰). Note maximum attainable fractional OC with different sea salt concentrations.
