Fiscal Year
2014
Title
Diving researches on deep-sea marine ecosystems after Tohoku tsunami
Project and Theme
Project 3. Research on factors controlling open ocean benthopelagic ecosystem dynamics
Representative Organization: Japan Agency for Marine-Earth Science and Technology
Theme1. Analysis of marine ecosystem change| Representative person | Yoshihiro Fujiwara |
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| Organization | Japan Agency for Marine-Earth Science and Technology |
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| Department | Eastern Japan Marine Ecosystems Dynamics Project team |
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Research InformationPeriod and Interval2014/09/27 - 2014/10/06
Research Area
CategoryResearch Cruise
OverviewTo estimate density and influence of the tsunami debris on marine ecosystems, diving researches will be concucted using the newly developed ROV "Crambon" off Miyagi and Iwate. High difinition TV images will be taken and biological samples and debris will be collected from the deep sea. In addition, sediment sampling will be conducted using a multiple coring system.
Overview of the Observation
Research Point Table
| Point | | Name | CRB012 |
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| Coordinates | 38.568517,141.9535 |
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| Name | CRB013 |
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| Coordinates | 38.571067,142.123417 |
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| Name | CRB014 |
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| Coordinates | 39.253383,142.302433 |
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| Name | CRB015 |
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| Coordinates | 38.90615,141.903867 |
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| Name | CRB016 |
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| Coordinates | 38.608467,142.408267 |
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Results and Future PlanROV dives, deployment of deep-sea lander, sediment collection using a multiple corer, plankton survey using VPR and ORI net and topographic survey were conducted.
Two test dives and five research dives were done using ROV Crampon off Minamisanriku, Kamaishi and Hirota. Stereo mapping, suction sampling of animals and debris collection were conducted. No large sunken debris that disturbs fishery was observed during this cruise but small debris was occasionally observed.
A deep-sea lander was deployed in the Kamaishi Valley (39-14.589'N, 142-18.208'E, 764m) where a large organic mat was discovered during NT13-21. Core sediments were collected using a multiple corer at the organic mat location. Plankton images were taken using VPR and the plankton was collected using ORI net at same night.
Investigation Item and Data Acquisition
| Investigation Item | Data Acquisition |
|---|
| ROV | video, still images |
| ROV | CTD/DO |
| ROV | Digital still Camera Picture |
| ROV | Hi-Vison video image |
| Multiple corers | sediments |
Reference
Related Observation Plan
Related Observation Data
Person in charge of Investigation
| Representative person | Yoshihiro Fujiwara |
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| Organization | Japan Agency for Marine-Earth Science and Technology |
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| Department | Eastern Japan Marine Ecosystems Dynamics Project team |
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| Fiscal Year | 2014 |
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| Organization | Japan Agency for Marine-Earth Science and Technology |
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| Category | Research Cruise |
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| Research Area | South Sanriku |
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| Discipline | Ocean physics -> Water temperature
Ocean physics -> Salinity
Ocean physics -> Ocean current / Tidal current (Current direction/Current speed)
Ocean chemistry -> Dissolved oxygen
Ocean environment -> Others
Ocean biology / Ocean ecology -> Others
Topography / Geology / Geophysics -> Bathymetry
Topography / Geology / Geophysics -> Topography
Topography / Geology / Geophysics -> Stratigraphy
Topography / Geology / Geophysics -> Marine sediments
Topography / Geology / Geophysics -> Geomagnetism
Topography / Geology / Geophysics -> Gravity
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