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  • Profiles of total absorption coefficient of sea water at 440 nm with Hobilabs a-Sphere integrating sphere instrument (excluding pure water absorption). Taken coincident with SBE19+ and ISUS (nitrate sensor) profiles. AC-9 profiles were taken right after a-Sphere profiles were completed. In situ profiles of optical properties were made from a heated tent at the ice camp several hundred meters away from the ship.