Abstract
A new type of simple water sampler which can be used to simultaneous multi-depth observation in the coastal sea area was developed. Using this sampler, about 100ml sea water samples were obtained at about 1 m interval of depth in Tokyo Bay and their nutrient concentrations were measured. Less than 15 minutes was needed to get 23 multi-depth samples with this sampler. The observed vertical distribution patterns of nutrients indicate that the simultaneous samplings at multiple depths were successfully carried out and detailes vertical observations of this kind are required to estimate accurately total amounts of nutrients in this sea area.
