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- 2021-1-17
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No. 155.Hurricane
[Main Idea] New research proved that hurricane activity in North Atlantic just back to mormal frequency, and was not caused by climate change as some scientists thought.
[Structure]
P1: New Idea: hurricane return to normal frequency, and not because of climate change.
P2: K's found and two factors
1995-2005: average stronger; However,1971-1994: average only 1.5 (Means H returns to normal.)
2 factors: wind shear(weaken) & sea-surface temperature(strengthen)
P3: K studied wind shear back to 1730.
P4: Other researchers studied sea-surface temperature & hurricane frequency.
Found: WS has stronger infulence than ST.
P5: D's study: long-term, strong wind shear & reduced hurricane frequency
P6: Hurricane & EN during past 5,000 years.(EN will increase WS)
P7: Strong and frequent EN(wind shear) & fewer hurricanes (Means H is not caused by climate change.)
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