Climatological annual cycle of upper ocean oxygen content anomaly

Mathematics – Logic

Scientific paper

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Global Change: Oceans (1616, 3305, 4215, 4513), Oceanography: General: Climate And Interannual Variability (1616, 1635, 3305, 3309, 4513), Oceanography: Biological And Chemical: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 1615, 4912), Oceanography: Biological And Chemical: Gases, Oceanography: Physical: Decadal Ocean Variability (1616, 1635, 3305, 4215)

Scientific paper

The climatological annual cycle of oxygen content anomaly of the 0-100 m depth layer for major ocean basins is described using Fourier analysis of objectively analyzed monthly O2 anomaly values on a 1° grid (70°S-70°N). The largest seasonal changes in O2 content anomaly occur in the extra-tropics in the 30° to 60° latitude belt of each hemisphere. The magnitude of the global cycle is dominated by the Pacific Ocean. The annual and semi-annual harmonics account for most (>90%) of the annual cycle of the monthly O2 content anomaly. The magnitude of the annual harmonic is largest in the upper 75 m layer except in the tropics and high latitudes. The annual harmonic accounts for >90% of the variance of the zonally integrated monthly O2 content anomaly.

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