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In connection with the Palmer LTER program, mixed layer water samples were collected during the cruise of the L.M. Gould in Jan., 2008 at 49 stations on a 20 × 100 km grid in the West Antarctica Peninsula (WAP) region of the Southern Ocean. In this study, [O₂]/[Ar] ratios and the triple isotope composition of dissolved O₂ were measured, and were used to estimate net community O₂ production (NCP) and gross primary O₂production (GPP), respectively. These estimates are further converted to carbon export production, primary production and the f‐ratio. Our measurements give NCP ranging from −3 to 76 mmol O₂ m⁻² day⁻¹ (−25 to 650 mg C m⁻² day⁻¹), and GPP from 40 to 220 mmol O₂ m⁻² day⁻¹ (180 to 1010 mg C m⁻² day⁻¹). The O₂ NCP/GPP ratios range from −0.04 to 0.43, corresponding to f‐ratios of −0.08 to 0.83. NCP and the NCP/GPP ratio are highest in the northern coastal areas, and decrease to …