Yender said that so far, no debris confirmed to be from the tsunamis has
landed on American shores, including large buoys suspected to be from
Japanese oyster farms found in Alaska last year. The buoys would have had to
travel faster than currents to get to Alaska at that time if they were set
loose by the March 11 tsunamis.
Similar buoys have washed ashore in Alaska and the US West Coast before the
tsunami, she said.
Yender said there is little chance of any debris being contaminated by
radiation. The debris came from a large swath of Japan’s northeastern coast,
not only near the tsunami-damaged nuclear power plant in Fukushima. Further,
it was dragged out to sea with the tsunamis, not while the Fukushima plant
experienced multiple meltdowns.
Nicholas Mallos, a conservation biologist and marine debris specialist for the
Ocean Conservancy, said many of the objects in the debris were expected to
be from Japan’s fishing industry. That could pose a risk for wildlife, such
as endangered Hawaiian monk seals, if fishing gear washes up on coral reefs
or beaches.
“The major question is how much of that material has sank since last
year, and how much of that remains afloat or still in the water column,”
Mallos said.
Maximenko said the dispersion of the debris makes it more difficult to track
but no less hazardous.
“In many cases it’s not density that matters, it’s total amount,”
he said. “For example, if there’s a current flowing around Midway
island, that island would collect debris like a trawl moving across the
ocean. It will collect all the debris on its way.”
Ultimately, Maximenko said, tsunami debris will join garbage floating in a
gyre north of Hawaii produced by swirling Pacific currents. Much of that
trash in a wide area known as the Great Pacific Garbage Patch is bits of
plastic, which slowly breaks down into smaller pieces but doesn’t completely
disappear.
It was unclear whether large items like refrigerators will make it across the
ocean because there has been little precedent for such an event.
Source: agencies
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