臭氧层空洞对全球变暖影响不大
文章来源:未知 文章作者:enread 发布时间:2013-08-09 08:00 字体: [ ]  进入论坛
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A lot of people mix up the ozone1 hole and global warming, believing the hole is a major cause of the world's increasing average temperature. Scientists, on the other hand, have long attributed a small cooling effect to the ozone shortage in the hole. Now a new computer-modeling study suggests that the ozone hole might actually have a slight warming influence, but because of its effect on winds, not temperatures. The new research suggests that shifting wind patterns caused by the ozone hole push clouds farther toward the South Pole, reducing the amount of radiation the clouds reflect and possibly causing a bit of warming rather than cooling.
 
"We were surprised this effect happened just by shifting the jet stream and the clouds," said lead author Kevin Grise, a climate scientist at Lamont-Doherty Earth Observatory2 of Columbia University in New York City.
 
Grise notes this small warming effect may be important for climatologists trying to predict the future of Southern Hemisphere climate.
 
The work is detailed3 in Geophysical Research Letters, a journal of the American Geophysical Union. Grise collaborated4 on the study with Lorenzo Polvani of Columbia University, George Tselioudis of NASA Goddard Institute for Space Studies, Yutian Wu of New York University, and Mark Zelinka of Lawrence Livermore National Laboratory.
 
Hole in the sky
 
Each ozone molecule5 consists of three oxygen atoms bound together. These ozone molecules6 gather in the lower portion of the stratosphere about 20 to 30 kilometers (12 to 19 miles) above the ground -- about twice as high as commercial airliners7 fly.
 
Thankfully for the living things below, this layer of ozone shields Earth from some of the hazardous8 ultraviolet radiation barraging9 the atmosphere. Unchecked, these ultraviolet rays can cause sunburns, eye damage and even skin cancer.
 
In the 1980s, scientists discovered thinning of the ozone layer above Antarctica during the Southern Hemisphere's spring months. The cause of this "hole" turned out to be chlorofluorocarbons, such as Freon, from cooling systems, aerosols10 cans and degreasing solvents11, which break apart ozone molecules. Even though the1987 Montreal Protocol12 banned these chlorofluorocarbons worldwide, the ozone hole persists decades later.
 
Many people falsely equate13 the ozone hole to global warming. In a 2010 Yale University poll, 61 percent of those surveyed believed the ozone hole significantly contributed to global warming. Additionally, 43 percent agreed with the statement "if we stopped punching holes in the ozone layer with rockets, it would reduce global warming."
 
An actual consequence of the ozone hole is its odd effect on the Southern Hemisphere polar jet stream, the fast flowing air currents encircling the South Pole. Despite the ozone hole only appearing during the spring months, throughout each subsequent summer the high-speed jet stream swings south toward the pole.
 
"For some reason when you put an ozone hole in the Southern Hemisphere during springtime, you get this robust14 poleward shift in the jet stream during the following summer season," said Grise. "People have been looking at this for 10 years and there's still no real answer of why this happens."


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1 ozone omQzBE     
n.臭氧,新鲜空气
参考例句:
  • The ozone layer is a protective layer around the planet Earth.臭氧层是地球的保护层。
  • The capacity of ozone can adjust according of requirement.臭氧的产量可根据需要或调节。
2 observatory hRgzP     
n.天文台,气象台,瞭望台,观测台
参考例句:
  • Guy's house was close to the observatory.盖伊的房子离天文台很近。
  • Officials from Greenwich Observatory have the clock checked twice a day.格林威治天文台的职员们每天对大钟检查两次。
3 detailed xuNzms     
adj.详细的,详尽的,极注意细节的,完全的
参考例句:
  • He had made a detailed study of the terrain.他对地形作了缜密的研究。
  • A detailed list of our publications is available on request.我们的出版物有一份详细的目录备索。
4 collaborated c49a4f9c170cb7c268fccb474f5f0d4f     
合作( collaborate的过去式和过去分词 ); 勾结叛国
参考例句:
  • We have collaborated on many projects over the years. 这些年来我们合作搞了许多项目。
  • We have collaborated closely with the university on this project. 我们与大学在这个专案上紧密合作。
5 molecule Y6Tzn     
n.分子,克分子
参考例句:
  • A molecule of water is made up of two atoms of hygrogen and one atom of oxygen.一个水分子是由P妈?f婘??妈?成的。
  • This gives us the structural formula of the molecule.这种方式给出了分子的结构式。
6 molecules 187c25e49d45ad10b2f266c1fa7a8d49     
分子( molecule的名词复数 )
参考例句:
  • The structure of molecules can be seen under an electron microscope. 分子的结构可在电子显微镜下观察到。
  • Inside the reactor the large molecules are cracked into smaller molecules. 在反应堆里,大分子裂变为小分子。
7 airliners 1ec0b4504c9e854df736acf1fcb02db5     
n.客机,班机( airliner的名词复数 )
参考例句:
  • The fog grounded the airliners. 大雾迫使班机停飞。 来自《简明英汉词典》
  • They placed very stable and accurate atomic clocks on regularly scheduled jet airliners. 他们将非常稳定、准确的原子钟装在定期飞行的喷气式班机上。 来自辞典例句
8 hazardous Iddxz     
adj.(有)危险的,冒险的;碰运气的
参考例句:
  • These conditions are very hazardous for shipping.这些情况对航海非常不利。
  • Everybody said that it was a hazardous investment.大家都说那是一次危险的投资。
9 barraging 2ee275fac0d2d0bf94721ae732cffd4c     
v.火力攻击(或阻击)( barrage的现在分词 );以密集火力攻击(或阻击)
参考例句:
10 aerosols a9c7ea700e36caa4c48a8c693762372f     
n.气溶胶( aerosol的名词复数 );喷雾剂;(气体中的)浮粒;喷雾器
参考例句:
  • Aerosols are present throughout the atmosphere. 气溶胶存在于整个大气层。 来自辞典例句
  • Deodorants are available as aerosols or roll-ons. 除臭剂有喷雾装或滚抹装。 来自辞典例句
11 solvents 034b168fe60271d2a244d289076119b4     
溶解的,溶剂
参考例句:
  • It is resistant to borohydride reduction in alcoholic solvents. 在醇溶剂中,它不能被硼氢化物还原。
  • Strains require special treatments for removal such as spotting with organic solvents. 要清除这些着色物质,需要特殊处理,例如:滴加有机溶剂。
12 protocol nRQxG     
n.议定书,草约,会谈记录,外交礼节
参考例句:
  • We must observe the correct protocol.我们必须遵守应有的礼仪。
  • The statesmen signed a protocol.那些政治家签了议定书。
13 equate NolxH     
v.同等看待,使相等
参考例句:
  • You can't equate passing examination and being intelligent.你不能把考试及格看成是聪明。
  • You cannot equate his poems with his plays.你不可以把他的诗歌和他的剧本相提并论。
14 robust FXvx7     
adj.强壮的,强健的,粗野的,需要体力的,浓的
参考例句:
  • She is too tall and robust.她个子太高,身体太壮。
  • China wants to keep growth robust to reduce poverty and avoid job losses,AP commented.美联社评论道,中国希望保持经济强势增长,以减少贫困和失业状况。
TAG标签: global carbon ozone
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