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

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

Revision History

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 2023

Ship Name	Cruise No.	Observation Area	Start Date	End Date
Keifu Maru	2305	South of Honshu, the East China Sea and the Sea of Japan	09 Jul. 2023	25 Aug. 2023
Keifu Maru	2306	The western North Pacific	06 Sep. 2023	30 Sep. 2023
Ryofu Maru	2306	The western North Pacific	21 Jul. 2023	12 Aug. 2023
Ryofu Maru	2307	South of Honshu, the East China Sea and the Sea of Japan	21 Aug. 2023	18 Sep. 2023

JMA Data Report of Oceanographic Observations Special Issue is preserved by the National Diet Library's Web Archiving Project (WARP). (Go to the WARP page.)