Download - Angels under the drift ice
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23-1 JOCV
Takatoshi AKAI
K.W.S. Malindi Marine National Park
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What is drift ice?• Hokkaido in Japan is one of the
southernmost area in the world.• In winter, people in Shiretoko realize
winter when they see drift ice. • Drift ice can only see in Shiretoko, due to
its environment, such as sea surrounded by land and channel is shallow.
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Where are they come from?• Pure water will be iced under 0 .℃• Sea water will be iced under -1.8 .℃• Temperature of sea water depends on depth.• Sea water moves by current.• Therefore, sea water is difficult to be ice even -1.8 .℃
•However, in the case of Ohotsuku;Pure water from Amur river into Ohotsuku.Before pure water and sea water mix, the water refrigerated by north wind and iced from surface.This is how to drift ice created.
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Problem: Global Warming
• The drift ice in Ohotsuku is getting smaller by year.• Due to global warming ice from Amur river is thin, so
when the drift ice reached to Shiretoko, its only a few.
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• “Drift Ice” brings nutrient and oxygen with cool water.
• When the “Drift Ice” reduced, the current movement caused by sea temperature also reduced.
• When the current movement reduced, sea creatures are difficult to eat and effect to eco system.
What will happen, if drift ice reduced?
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Case Study: Sea Calf (Gomafu-azarashi)
• Sea calf usually breeding on the drift ice.
• However, reduced drift ice made them to move to the Japan Sea.
• People are pleased to see Sea Calf, but once the eco-system with drift ice destroyed, they will face to endangered.
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• Date: 20 February
• Depart from “Shiretoko”.
• It takes about 30 minutes.
• Wear warm clothe.
• Get on “Shiretoko Maru”.
Shiretoko
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Creatures in Ohotsuku• Drift ice brings water from the deep sea. It
contained oxygen and mineral to feed small creatures, such as Krill.
• Small fish and whales eat Krill.• Penguins and seals eat small fish. • White bears and eagles eat penguins and seals.
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Mammals in Ohotsuku
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Angels under the drift ice
• “Clione limacina”, we call it clione.• Categorized as a shellfish.• Approximately 1cm.• Looks like an angel, so their nick name is
“Angels under the drift ice”
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Lunch Time: Viking
• Ohotsuku is famous for big crab named “Taraba Gani”.
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• Grilled fish
•Scallop BBQ
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Whale meat
Japanese in northern area used to eat whale meat.
Taste delicious, because the meat swimming in fat.
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Kaisen-don:海鮮丼
Various kinds of fish with rice and soy source.
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Drift ice walking
• We used to have walking tour on the drift ice, but due to global warming, we cannot enjoy drift ice walking these days.
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Conclusion
• Drift ice contribute to maintain bio diversity
• However, due to global warming, we can not see drift ice these days
• We should concern about
stop global warming.
• And plz come to Shiretoko.