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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.

Spring of 2023

Ship NameCruise No.Observation AreaStart DateEnd Date
Keifu Maru2302East of Honshu 10 Apr. 202313 May 2023
Keifu Maru2303East of Honshu 18 May 202325 May 2023
Keifu Maru2304South of Honshu and the East China Sea 03 Jun. 202303 Jul. 2023
Ryofu Maru2302South of Honshu 19 Apr. 202327 Apr. 2023
Ryofu Maru2303The western North Pacific, the Sea of Japan and the East China Sea 06 May 202308 Jun. 2023
Ryofu Maru2304South of Honshu and the East China Sea 14 Jun. 202322 Jun. 2023
Ryofu Maru2305South of Honshu and the East China Sea 28 Jun. 202314 Jul. 2023