Nansen bottle

A Nansen bottle is a specialized device used by oceanographers to collect water samples from specific depths in the ocean. It consists of a tubular container with openings at each end, equipped with a mechanism that seals the container when it reaches the desired depth, preventing water from mixing with surface layers. This allows scientists to analyze water properties, such as temperature, salinity, and chemical composition, at precise depths. The Nansen bottle has been a fundamental tool in oceanographic research, helping us understand ocean currents, marine ecosystems, and the Earth's climate system.