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The SOLAS Air-sea Gas exchange Experiment (SAGE) was a combined gas-transfer process study and iron addition experiment (FeAX) conducted in sub-Antarctic waters of the southwest Bounty Trough (46.5°S 172.5°E) to the south-east of New Zealand between mid-March and mid-April 2004.The experiment was designed as a lagrangian study of air-sea gas exchange processes of CO2,DMS and other biogenic gases associated with an iron-induced phytoplankton bloom.In conjunction with the iron fertilisation a dual tracer SF6/3He release served to quantify both patch evolution and air-sea tracer exchange at the 10’s of km’s scale.Dual-tracer measurements were obtained at highest open-ocean windspeeds to date,and have resulted in an improved gas-exchange parameterisation applicable to the windswept southern ocean,and important to assessment of the regional sink for anthropogenic CO2.