Ocean Color and Temperature Scanner (OCTS) aboard Advanced Earth Observation Satellite (ADEOS), which was launched in August 1996 and had been operated till June 1997, Observed Chlorophyll-a (Chl-a) and Sea Surface Tmperature (SST) distributions in the global oceans first as the Japanese satellite sensor. Synchronizing the OCTS observation, ADEOS field campaign for oceanography was conducted in the sea off Sanriku, the western North Pacific Ocean, by many researchers and research vessels. The OCTS Chl-a and SST images with the high spatial resolution clearly captured the phytoplankton spring blooming. Combining the OCTS data and the in situ data, oceanographic studies from the biological, chemical and physical aspects and their mutual interaction aspect have been carried out. In this paper, ADEOS/OCTS, which contributed to a new evolution of Japanese oceanography, and the Sanriku Field campaign are described and their significance is presented.
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