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.
The system of oceanographic and marine meteorological observations changed from five research vessels ( Ryofu Maru, Keifu Maru, Kofu Maru, Seifu Maru and Chofu Maru) to two ones ( Ryofu Maru and Keifu Maru) in April 2010.
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.
| Ship Name | Cruise No. | Observation Area | Start Date | End Date |
|---|---|---|---|---|
Keifu Maru | 1201 | South of Honshu and the East China Sea | 2012/01/08 | 2012/01/26 |
Keifu Maru | 1202 | The western North Pacific | 2012/02/03 | 2012/03/24 |
Ryofu Maru | 1201 | The western Pacific | 2012/01/11 | 2012/02/29 |
Ryofu Maru | 1202 | East of Honshu | 2012/03/06 | 2012/03/25 |