Japan Tsunami Debris Tracked Across Pacific Ocean
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Uploaded on Apr 8, 2011
Where Will the Debris from Japans Tsunami Drift in the Ocean?
The powerful tsunami triggered by the 9.0 Tohoku Earthquake destroyed coastal towns near Sendai in Japan, washing such things as houses and cars into the ocean. Projections of where this debris might head have been made by Nikolai Maximenko and Jan Hafner at the International Pacific Research Center, University of Hawaii at Manoa. Maximenko has developed a model based on the behavior of drifting buoys deployed over years in the ocean for scientific purposes. What this model predicts about the tsunami debris can be seen in this simulation.
The debris first spreads out eastward from the Japan Coast in the North Pacific Subtropical Gyre. In a year, the Northwestern Hawaiian Islands Marine National Monument will see pieces washing up on its shores; in two years, the remaining Hawaiian islands will see some effects; in three years, the plume will reach the US West Coast, dumping debris on Californian beaches and the beaches of British Columbia, Alaska, and Baja California. The debris will then drift into the famous North Pacific Garbage Patch, where it will wander around and break into smaller and smaller pieces.
In five years, Hawaii shores can expect to see another barrage of debris that is stronger and longerlasting than the first one. Much of the debris leaving the North Pacific Garbage Patch ends up on Hawaii's reefs and beaches. These model projections will help to guide clean-up and tracking operations. Tracking will be important in determining what happens to different materials in the tsunami debris, for example, how the composition of the debris plume changes with time, and how the winds and currents separate objects drifting at different speeds.
Even before the tsunami, the World Ocean was a dump for rubbish flowing in from rivers, washed off beaches, and jettisoned from oil and gas platforms and from fishing, tourist, and merchant vessels. Marine debris has become a serious problem for marine ecosystems, fisheries, and shipping. The presentations given at the recent week-long 5th International Marine Debris Conference in Hawaii, at which Maximenko had organized a day-long workshop, are a testimony to the magnitude of the ocean debris problem. The massive, concentrated debris launched by the devastating tsunami is now magnifying the hazards.
Maximenko's long-standing work on ocean currents and transports predicted that there are five major regions in the World Ocean where debris collects if it is not washed up on shores or sinks to the ocean bottom, deteriorates, or is ingested by marine organisms. These regions turn out to be "garbage patches." The North Pacific Garbage Patch has become famous, the North Atlantic Patch was fixed some years ago, and the South Atlantic, South Indian Ocean, and South Pacific patches have just been found, guided by the map of his model that shows where floating marine debris should collect.
This research was supported by grants from the Japan Agency for Marine-Science and Technology (JAMSTEC), NASA, and NOAA.
Japan Earthquake Tsunami Flooding Sendai Tokyo 8.9 9.1 Magnitude Quake Offshore Megathrust Waves Damage Fatalities City Aftershock Epicenter Death Toll Casualties Trapped Missing Rubble Nuclear Emergency Power Plant Failure Cooling Systems Fukushima Leak Radiation Radioactive Material Dead Buildings Explosion Rescue Survivors Meteorological Seismic Scale Miyagi Prefecture Oshika Peninsula Tōhoku Largest Recorded Pacific Ocean Northeast Coast Haiti Chile東北地方太平洋沖地震 2011
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