= Oceanographer
An <oceanographer> studies ocean systems through <observations> and models. Physical questions concern currents, <waves> and <heat transport>; chemical and biological questions connect seawater composition and living systems with those motions.
A <physical oceanographer> might combine <temperature> and salinity profiles with <velocity> <measurements> to infer water-mass formation and transport. Sampling location and time matter because a single profile is a local <observation> in a changing three-dimensional ocean.
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