墨西哥湾海域甲烷含量趋于正常水平-凯发k8官网

墨西哥湾海域甲烷含量趋于正常水平
文章来源:未知 文章作者:enread 发布时间:2011-01-07 01:44 字体: [ ] 
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calling the results "extremely surprising," researchers from the university of california, santa barbara and texas a&m university report that 1(甲烷,沼气) gas concentrations in the 2 of mexico have returned to near normal levels only months after a massive release occurred following the deepwater horizon oil rig explosion. findings from the research study, led by oceanographers(海洋学家) john kessler of texas a&m and david valentine of ucsb, were published today in science xpress, in advance of their publication in the journal science. the findings show that mother nature quickly saw to the removal of more than 200,000 metric tons of dissolved methane through the action of bacteria blooms that completely consumed the immense gas 3 the team had identified in mid-june. at that time, the team reported finding methane gas in amounts 100,000 times above normal levels. but, about 120 days after the initial spill, they could find only normal concentrations of methane and clear evidence of complete methane 4(呼吸) .

"what we observed in june was a horizon of deep water 5 with methane and other 6 gases," valentine said. "when we returned in september and october and tracked these waters, we found the gases were gone. in their place were 7(剩余的) methane-eating bacteria, and a 1 million ton 8 in dissolved oxygen that we attribute to respiration of methane by these bacteria."

kessler added: "based on our measurements from earlier in the summer and previous other measurements of methane respiration rates around the world, it appeared that (deepwater horizon) methane would be present in the gulf for years to come. instead, the methane respiration rates increased to levels higher than have ever been recorded, ultimately consuming it and prohibiting its release to the atmosphere."

while the scientists' research documents the changing conditions of the gulf waters, it also sheds some light on how the planet functions naturally.

"this tragedy enabled an impossible experiment," valentine said, "one that allowed us to track the fate of a massive methane release in the deep ocean, as has occurred naturally throughout earth's history."

kessler 9: "we were glad to have the opportunity to lend our 10(专门知识) to study this oil spill. but also we tried to make a little good come from this disaster and use it to learn something about how the planet functions naturally. the seafloor stores large quantities of methane, a 11(有效的) greenhouse gas, which has been suspected to be released naturally, 12 global climate. what the deepwater horizon incident has taught us is that releases of methane with similar characteristics will not have the capacity to influence climate."

the deepwater horizon 13 drilling platform exploded on april 20, 2010, about 40 miles off the louisiana coast. the blast killed 11 workers and injured 17 others. oil was 14(涌出) from the site at the rate of 62,000 barrels per day, eventually spilling an estimated 170 million gallons of oil into the gulf. the leak was capped on july 15, and the well was 15 sealed on sept. 19.

the research team collected thousands of water samples at 207 locations covering an area of about 36,000 square miles. the researchers based their conclusions on measurements of dissolved methane concentrations, dissolved oxygen concentrations, methane oxidation rates(氧化率) , and microbial community structure.



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1 t1eyx     
n.甲烷,沼气
参考例句:
  • the blast was caused by pockets of methane gas that ignited.爆炸是由数袋甲烷气体着火引起的。
  • methane may have extraterrestrial significance.甲烷具有星际意义。
2 1e0xp     
n.海湾;深渊,鸿沟;分歧,隔阂
参考例句:
  • the gulf between the two leaders cannot be bridged.两位领导人之间的鸿沟难以跨越。
  • there is a gulf between the two cities.这两座城市间有个海湾。
3 15625acbfa4517aa1374a6f1f44be446     
羽毛( plume的名词复数 ); 羽毛饰; 羽毛状物; 升上空中的羽状物
参考例句:
  • the dancer wore a headdress of pink ostrich plumes. 那位舞蹈演员戴着粉色鸵鸟毛制作的头饰。
  • the plumes on her bonnet barely moved as she nodded. 她点点头,那帽子的羽毛在一个劲儿颤动。
4 us7yt     
n.呼吸作用;一次呼吸;植物光合作用
参考例句:
  • they tried artificial respiration but it was of no avail.他们试做人工呼吸,可是无效。
  • they made frequent checks on his respiration,pulse and blood.他们经常检查他的呼吸、脉搏和血液。
5 p2gx5     
adj.装满了的;充满了的;负了重担的;苦恼的
参考例句:
  • he is laden with heavy responsibility.他肩负重任。
  • dragging the fully laden boat across the sand dunes was no mean feat.将满载货物的船拖过沙丘是一件了不起的事。
6 tcmzs     
n.烃,碳氢化合物
参考例句:
  • during incomplete combustion some of the hydrocarbon fuel is cracked.在不完全的燃烧中,一些烃燃料裂解。
  • the hydrocarbon must be an alkene.这个碳氢化合物必定是烯烃。
7 swcxl     
adj.复播复映追加时间;存留下来的,剩余的
参考例句:
  • there are still a few residual problems with the computer program.电脑程序还有一些残留问题。
  • the resulting residual chromatism is known as secondary spectrum.所得到的剩余色差叫做二次光谱。
8 tmazu     
n.亏空,亏损;赤字,逆差
参考例句:
  • the directors have reported a deficit of 2.5 million dollars.董事们报告赤字为250万美元。
  • we have a great deficit this year.我们今年有很大亏损。
9 5n4zxc     
adj.著名的,知名的
参考例句:
  • the local hotel is noted for its good table.当地的那家酒店以餐食精美而著称。
  • jim is noted for arriving late for work.吉姆上班迟到出了名。
10 fmtx0     
n.专门知识(或技能等),专长
参考例句:
  • we were amazed at his expertise on the ski slopes.他斜坡滑雪的技能使我们赞叹不已。
  • you really have the technical expertise in a new breakthrough.让你真正在专业技术上有一个全新的突破。
11 c1uzk     
adj.强有力的,有权势的;有效力的
参考例句:
  • the medicine had a potent effect on your disease.这药物对你的病疗效很大。
  • we must account of his potent influence.我们必须考虑他的强有力的影响。
12 3831b0b9165a263a37199f6886a6a3ff     
调整( modulate的现在分词 ); (对波幅、频率的)调制; 转调; 调整或改变(嗓音)的音调
参考例句:
  • in his horn solo,he kept modulating from key to key. 他在喇叭独奏时不断地变调。
  • water vapour and clouds are the primary variables modulating direct solar absorption. 水汽和云是调节直接太阳吸收的主要要素。
13 fiux8     
adj.海面的,吹向海面的;adv.向海面
参考例句:
  • a big program of oil exploration has begun offshore.一个大规模的石油勘探计划正在近海展开。
  • a gentle current carried them slowly offshore.和缓的潮流慢慢地把他们带离了海岸。
14 313eef130292e797ea104703d9458f2d     
adj.迸出的;涌出的;喷出的;过分热情的v.喷,涌( gush的现在分词 );滔滔不绝地说话
参考例句:
  • blood gushing from a wound 从伤口冒出的血
  • the young mother was gushing over a baby. 那位年轻的母亲正喋喋不休地和婴儿说话。 来自《简明英汉词典》
15 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。
tag标签: research gas methane mexico
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