4.2.2. Variability in Surface Distribution and Sea-Air Fluxes
The positive F CO2 densities during winter shows that
inner shelf of Kunene and Walvis Bay acts as a remarkable source of
CO2 to the atmosphere. We computed a significant F
CO2 density in winter within the inner shelf of Kunene,
representing the highest daily average of F CO2;x̅ ± σM: 120.11 ± 3.54 mmol m-2d-1 relative to moderate (x̅ ±
σM: 54.20 ± 3.23 mmol m-2d-1) F CO2 density in the inner shelf
off Walvis Bay. In contrast, the BUS was a small source of
CO2 or almost in equilibrium relative to the atmosphere
during summer (F CO2(Kunene ): x̅ ±
σM: 0.08 ± 0.01 mmol m-2d-1 and F CO2(Walvis Bay ):x̅ ± σM: 0.13 ± 0.14 mmol m-2d-1) (Figure 6). Our results were in line with the
previous report of higher f CO2 and fluxes off
Cape Frio and the Kunene Estuary in winter and spring (May to December)
linked to the regional formation of upwelling filaments and eddies
relative to an oceanic-atmospheric equilibrium state in central Namibia
(Santana-Casiano et al., 2009).