龙卷风频率和“全球变暖”趋势是微弱的负相关的。如果现在龙卷风多了,


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送交者: 三脚猫 于 2011-05-26, 00:13:41:

恰恰说明气候变冷了。跟这几年的严冬暴雪一致(2010年厄尔尼诺年除外)。

http://thelede.blogs.nytimes.com/2011/05/23/your-questions-on-joplin-mo-and-the-seasons-storms/

引用:

Q.Can the intensity of this year’s tornadoes be blamed on climate change?

A.Probably not. Over all, the number of violent tornadoes has been declining in the United States, even as temperatures have increased, making it likely that this year’s twister outbreak is simply a remarkable and terrifying — but natural — event.

Climate science has long predicted that global warming will cause more weather extremes, however, and statistics suggest this has started to happen. In most areas of the world where good weather data is available, instances of heavy precipitation are rising, often leading to flash flooding. And the same thing is true of heat waves; in the United States, new high-temperature records for a given date now occur twice as often as record lows.

That said, scientists are reluctant to attribute any specific weather event to global warming. And, at least so far, only a handful of studies have suggested that tornadoes are likely to become more frequent or more intense on a warming planet; this has not become a mainstream prediction within climate science. Frustratingly, it is likely to be a year or two before we get good published analyses of the causes for this season’s strange weather — and it may be decades before science can conclusively demonstrate whether or not human-driven warming is affecting tornado frequency. — JOHN COLLINS RUDOLF and JUSTIN GILLIS





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