龙卷风的强度频率与气候变化-凯发k8官网

龙卷风的强度频率与气候变化

文章来源：未知文章作者：enread 发布时间：2014-08-08 07:48 字体： [ ]　

(单词翻译:双击或拖选)

new research by a florida state university geography professor shows that climate change may be playing a key role in the strength and frequency of ² hitting the united states. published wednesday in the journal climate ³, professor james elsner writes that though tornadoes are forming fewer days per year, they are forming at a greater ⁴ and strength than ever before. so, for example, instead of one or two forming on a given day in an area, there might be three or four occurring.

"we may be less threatened by tornadoes on a day-to-day basis, but when they do come, they come like there's no tomorrow," elsner said.

elsner, an expert in climate and weather trends, said in the past, many researchers dismissed the impact of climate change on tornadoes because there was no distinct pattern in the number of ¹ days per year. in 1971, there were 187 tornado days, but in 2013 there were only 79 days with tornadoes.

but a deeper dive into the data showed more severity in the types of storms and that more were happening on a given day than in previous years.

"i think it's important for forecasters and the public to know this," elsner said. "it's a matter of making sure the public is aware that if there is a higher risk of a storm, there may actually be multiple storms in a day."

the united states experiences more tornadoes than any other country, and despite advances in technology and warning systems, they still remain a hazard to residents in storm-prone areas. the 2011 tornado season, for example, had nearly 1,700 storms and killed more than 550 people.

so far, in 2014, there have been 189 storms with a death ⁵ of 43, according to the noaa/national weather service storm prediction center.

one bright spot of news in the research, elsner added, was that the ⁶ areas impacted most regularly by tornadoes do not appear to be growing.

elsner was joined on the paper by independent researcher thomas h. jagger, ⁷ a research associate at florida state university, and meteorologist（气象学者） svetoslava elsner.

点击

收听单词发音

1
n.飓风，龙卷风
参考例句：
a tornado whirled into the town last week.龙卷风上周袭击了这座城市。 the approaching tornado struck awe in our hearts.正在逼近的龙卷风使我们惊恐万分。

2
n.龙卷风，旋风( tornado的名词复数 )
参考例句：
tornadoes, severe earthquakes, and plagues create wide spread havoc. 龙卷风、大地震和瘟疫成普遍的毁坏。来自互联网 meteorologists are at odds over the working of tornadoes. 气象学者对龙卷风的运动方式看法不一。来自互联网

3
n.力学，动力学，动力，原动力；动态
参考例句：
in order to succeed,you must master complicated knowledge of dynamics.要取得胜利，你必须掌握很复杂的动力学知识。 dynamics is a discipline that cannot be mastered without extensive practice.动力学是一门不做大量习题就不能掌握的学科。

4
n.密集，密度，浓度
参考例句：
the population density of that country is 685 per square mile.那个国家的人口密度为每平方英里685人。 the region has a very high population density.该地区的人口密度很高。

5
n.过路(桥)费；损失，伤亡人数；v.敲(钟)
参考例句：
the hailstone took a heavy toll of the crops in our village last night.昨晚那场冰雹损坏了我们村的庄稼。 the war took a heavy toll of human life.这次战争夺去了许多人的生命。

6
adj.地理学的，地理的
参考例句：
the city's success owes much to its geographic position. 这座城市的成功很大程度上归功于它的地理位置。来自《简明英汉词典》 environmental problems pay no heed to these geographic lines. 环境问题并不理会这些地理界限。来自英汉非文学 - 环境法 - 环境法

7
adv.从前，以前
参考例句：
we now enjoy these comforts of which formerly we had only heard.我们现在享受到了过去只是听说过的那些舒适条件。 this boat was formerly used on the rivers of china.这船从前航行在中国内河里。