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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     

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 2022

Ship NameCruise No.Observation AreaStart DateEnd Date
Ryofu Maru2204The western North Pacific and the E ast China Sea 27 Jun. 202222 Jul. 2022
Ryofu Maru2205The western Pacific 27 Jul. 202220 Aug. 2022
Ryofu Maru2206The western North Pacific 24 Aug. 202217 Sep. 2022
Ryofu Maru2207The western North Pacific 29 Sep. 202202 Nov. 2022
Keifu Maru2205South of Honshu and the East China Se a 17 Jul. 202227 Aug. 2022
Keifu Maru2206The western North Pacific, the East China Sea and the Sea of Japan 31 Aug. 202202 Oct. 2022