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GEOPHYSICAL RESEARCH LETTERS, VOL. 32, L05611, doi:10.1029/2004GL021745, 2005

Climatological annual cycle of upper ocean oxygen content anomaly

Hernan E. Garcia

National Oceanographic Data Center, NOAA, Silver Spring, Maryland, USA


Tim P. Boyer

National Oceanographic Data Center, NOAA, Silver Spring, Maryland, USA


Sydney Levitus

National Oceanographic Data Center, NOAA, Silver Spring, Maryland, USA


Ricardo A. Locarnini

National Oceanographic Data Center, NOAA, Silver Spring, Maryland, USA


John I. Antonov

National Oceanographic Data Center, NOAA, Silver Spring, Maryland, USA


Abstract

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.

Received 13 October 2004; accepted 9 February 2005; published 10 March 2005.

Index Terms: 1635 Global Change: Oceans (1616, 3305, 4215, 4513); 4215 Oceanography: General: Climate and interannual variability (1616, 1635, 3305, 3309, 4513); 4805 Oceanography: Biological and Chemical: Biogeochemical cycles, processes, and modeling (0412, 0414, 0793, 1615, 4912); 4820 Oceanography: Biological and Chemical: Gases; 4513 Oceanography: Physical: Decadal ocean variability (1616, 1635, 3305, 4215).

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Citation: Garcia, H. E., T. P. Boyer, S. Levitus, R. A. Locarnini, and J. I. Antonov (2005), Climatological annual cycle of upper ocean oxygen content anomaly, Geophys. Res. Lett., 32, L05611, doi:10.1029/2004GL021745.