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Hypercane
A hypercane is a hypothetical class of extreme hurricane that could form if ocean temperatures reached around , which is warmer than the warmest ocean temperature ever recorded. Such an increase could be caused by a large asteroid or comet impact, a large supervolcanic eruption, or extensive global warming. There is some speculation that a series of hypercanes resulting from an impact by a large asteroid or comet contributed to the demise of the dinosaurs. The hypothesis was created by Kerry Emanuel of MIT who also coined the term.
==Description==
In order to form a hypercane, according to Emanuel's hypothetical model, the ocean temperature would have to be 48 °C (120 °F). A critical difference between a hypercane and present-day hurricanes is that a hypercane would extend into the upper stratosphere, whereas present-day hurricanes extend into only the lower stratosphere.
Hypercanes would have wind speeds of over , and would also have a central pressure of less than (700 millibars), giving them an enormous lifespan.〔 For comparison, the largest and most intense storm on record was 1979's Typhoon Tip, with a wind speed of and central pressure of (870 millibars). Such a storm would be eight times more powerful than the strongest storms yet recorded.
The extreme conditions needed to create a hypercane could conceivably produce a system up to the size of North America, creating storm surges of and an eye nearly across. The waters could remain hot enough for weeks, allowing more hypercanes to be formed. A hypercane's clouds would reach into the stratosphere. Such an intense storm would also damage the Earth's ozone.〔 Water molecules in the stratosphere would react with ozone to accelerate decay into O2 and reduce absorption of ultraviolet light.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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