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Oceanographic and Marine Meteorological Observations by Research Vessels

Oceanographic and marine meteorological observations are conducted in the western North Pacific and in the seas adjacent to Japan by two JMA research vessels named Ryofu Maru and Keifu Maru. Background marine pollution and greenhouse gases are also observed. For details of the data provided on this website, please refer to Description and Format of Data.

Observation Data

Year:     Please select a year and click the "Refresh" button.

Point to one of the seasons below to display all observation tracklines for the season. Clicking on the season shows a list of observation cruises for that period in the table on the right.

Winter      Spring      Summer      Fall     

Trackline of ship

Pointing to a ship name displays its trackline in the figure on the left. Click on the ship name to view the station chart and observation data of the cruise.

Summer of 2021

Ship NameCruise No.Observation AreaStart DateEnd Date
Ryofu Maru2106The western North Pacific 17 Jul. 202117 Aug. 2021
Ryofu Maru2107The western North Pacific 27 Aug. 202116 Sep. 2021
Ryofu Maru2108The western North Pacific 20 Sep. 202114 Oct. 2021
Keifu Maru2105The western North Pacific 05 Jul. 202101 Aug. 2021
Keifu Maru2106The western North Pacific 08 Aug. 202101 Sep. 2021
Keifu Maru2107The western North Pacific, the East China Sea and the Sea of Japan 05 Sep. 202105 Oct. 2021