科学家开始试验全球变暖对冻土层的影响-凯发k8官网

科学家开始试验全球变暖对冻土层的影响
文章来源:未知 文章作者:meng 发布时间:2010-06-27 05:42 字体: [ ] 
(单词翻译:双击或拖选)

scientists at the department of energy's oak 1 national laboratory are planning a large-scale, long-term 2 experiment to test the effects of global warming on the icy layers of arctic permafrost(永久冻土) . while ornl researchers have conducted extensive studies on the impact of climate change in 3(温和的,适度的) regions like east tennessee, less is known about the impact global warming could have on arctic regions.

"we're beginning to take these lessons learned and start applying them to sensitive and globally important 4, such as the arctic," said stan wullschleger of the environmental sciences division. "the arctic regions are important to the topic of global warming because of the large land area they occupy around the world and the layer of 5(永久地) frozen soil, known as permafrost."

wullschleger and a team of architects(建筑师) , engineers and biologists from ornl and other national laboratories design, simulate using computers and then field test(现场试验) large-scale manipulative experiments that purposely warm a test area in order to evaluate ecosystem response to projected climate conditions.

"evidence is emerging that the arctic is experiencing a greater degree of warming than the rest of the globe," wullschleger said. "there is growing concern that this warming is already affecting a wide range of physical and 6 processes in the arctic, including permafrost 7(退化,降级) . manipulative experiments will help us study these processes and their consequences in great detail."

in the arctic study for the department of energy's office of science, researchers seek to develop 8 designed above-and below-ground warming technologies to heat multiple plots of land about 20 meters in diameter. ornl researchers hope to eventually have 9 plots with treatments that include heating in combination with elevated carbon dioxide.

"the way we design and arrange the above- and below-ground heaters will allow us to warm the air and soil in a manner representing future conditions and then study the consequences of that warming," wullschleger said.

wullschleger and others working on the project hope to discover whether carbon stored in permafrost will be released as the soil warms. this could have major consequences for climate.

before work can begin, a team of engineers and architects must adapt the heater technology that has been used on the oak ridge reservation to study temperate region plants like 10 and oak trees to alaska's harsh winters and icy soil.

"we're developing a prototype because we haven't tested the equipment under arctic conditions before. in parts of alaska, temperatures will drop to minus-40 degrees fahrenheit," wullschleger said.

results from the prototype tests(原型测试) , modeling simulations, and other scientific analyses will be used to determine the location of the long-term ecosystem experiment.

wullschleger is 11 with the u.s. army cold regions research and engineering laboratory in fairbanks and the barrow arctic science consortium in barrow, alaska. the team plans to hold workshops in 12 with the international arctic research center at the university of alaska to get the science community involved in details of the planned experiment.

"that will be a major 13, and it will involve the support of the larger scientific community. we want to ensure, right from the beginning, that others are able to contribute to the development of this grand activity," wullschleger said.



点击收听单词发音收听单词发音  

1 kdvyh     
n.山脊;鼻梁;分水岭
参考例句:
  • we clambered up the hillside to the ridge above.我们沿着山坡费力地爬上了山脊。
  • the infantry were advancing to attack the ridge.步兵部队正在向前挺进攻打山脊。
2 wq4xz     
n.生态系统
参考例句:
  • this destroyed the ecosystem of the island.这样破坏了岛上的生态系统。
  • we all have an interest in maintaining the integrity of the ecosystem.维持生态系统的完整是我们共同的利益。
3 tihzd     
adj.温和的,温带的,自我克制的,不过分的
参考例句:
  • asia extends across the frigid,temperate and tropical zones.亚洲地跨寒、温、热三带。
  • great britain has a temperate climate.英国气候温和。
4 94cb0e40a815bea1157ac8aab9a5380d     
n.生态系统( ecosystem的名词复数 )
参考例句:
  • there are highly sensitive and delicately balanced ecosystems in the forest. 森林里有高度敏感、灵敏平衡的各种生态系统。 来自《简明英汉词典》
  • madagascar's ecosystems range from rainforest to semi-desert. 马达加斯加生态系统类型多样,从雨林到半荒漠等不一而足。 来自辞典例句
5 kluzuu     
adv.永恒地,永久地,固定不变地
参考例句:
  • the accident left him permanently scarred.那次事故给他留下了永久的伤疤。
  • the ship is now permanently moored on the thames in london.该船现在永久地停泊在伦敦泰晤士河边。
6 irrxx     
adj.生态的,生态学的
参考例句:
  • the region has been declared an ecological disaster zone.这个地区已经宣布为生态灾难区。
  • each animal has its ecological niche.每种动物都有自己的生态位.
7 qxkxl     
n.降级;低落;退化;陵削;降解;衰变
参考例句:
  • there are serious problems of land degradation in some arid zones.在一些干旱地带存在严重的土地退化问题。
  • gambling is always coupled with degradation.赌博总是与堕落相联系。
8 hviwq     
adv.特定地;特殊地;明确地
参考例句:
  • they are specially packaged so that they stack easily.它们经过特别包装以便于堆放。
  • the machine was designed specially for demolishing old buildings.这种机器是专为拆毁旧楼房而设计的。
9 08069c56938bbf6ddcc01ee2fd848af5     
复制( replicate的过去式和过去分词 ); 重复; 再造; 再生
参考例句:
  • later outplant the seedlings in a replicated permanent test plantation. 以后苗木出圃栽植成重复的永久性试验林。
  • the phage has replicated and the donor cells have lysed. 噬菌体已复制和给体细胞已发生裂解。
10 bbpxj     
n.槭树,枫树,槭木
参考例句:
  • maple sugar is made from the sap of maple trees.枫糖是由枫树的树液制成的。
  • the maple leaves are tinge with autumn red.枫叶染上了秋天的红色。
11 bd93aed5558c4b146fa553d822f7c432     
合作( collaborate的现在分词 ); 勾结叛国
参考例句:
  • joe is collaborating on the work with a friend. 乔正与一位朋友合作做那件工作。
  • he was not only learning from but also collaborating with joseph thomson. 他不仅是在跟约瑟福?汤姆逊学习,而且也是在和他合作。
12 bw7yd     
n.合作,协作;勾结
参考例句:
  • the two companies are working in close collaboration each other.这两家公司密切合作。
  • he was shot for collaboration with the enemy.他因通敌而被枪毙了。
13 mfkz7s     
n.保证,许诺,事业
参考例句:
  • he gave her an undertaking that he would pay the money back with in a year.他向她做了一年内还钱的保证。
  • he is too timid to venture upon an undertaking.他太胆小,不敢从事任何事业。
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